Measurements of the tt¯ production cross section in lepton+jets final states in pp collisions at 8 TeV and ratio of 8 to 7 TeV cross sections

Eu . Phys. J. C (2017) 77:15 DOI 10.1140/epjc/s10052-016-4504-z Regula A icle - Expe imen al Physics Measu emen s o he p oduc ion c oss sec ion in lep on+je s inal s a es in pp collisions a 8 TeV and a io o 8 o 7 TeV c oss sec ions CMS Collabo a ion∗ CERN, 1211 Gene a 23, Swi ze land Recei ed: 29 Feb ua y 2016 / Accep ed: 14 No embe 2016 / Published online: 7 Janua y 2017 © CERN o he bene i o he CMS collabo a ion 2017. This a icle is published wi h open access a Sp inge link.com Abs ac A measu emen o he op qua k pai p oduc- ion ( ) c oss sec ion in p o on–p o on collisions a he cen e-o -mass ene gy o 8 TeV is p esen ed using da a col- lec ed wi h he CMS de ec o a he LHC, co esponding o an in eg a ed luminosi y o 19.6 b−1. This analysis is pe - o med in he decay channels wi h one isola ed, high ans- e se momen um elec on o muon and a leas ou je s, a leas one o which is equi ed o be iden i ied as o igi- na ing om had oniza ion o a b qua k. The calib a ion o he je ene gy scale and he e iciency o b je iden i ica ion a e de e mined om da a. The measu ed c oss sec ion is 228.5±3.8(s a )±13.7(sys ) ±6.0 (lumi) pb. This mea- su emen is compa ed wi h an analysis o 7 TeV da a, co - esponding o an in eg a ed luminosi y o 5.0 b−1, o de e - mine he a io o 8 TeV o 7 TeV c oss sec ions, which is ound o be 1.43 ±0.04 (s a ) ±0.07(sys ) ±0.05 (lumi). The measu emen s a e in ag eemen wi h QCD p edic ions up o nex - o-nex - o-leading o de . 1 In oduc ion Top qua ks a e abundan ly p oduced a he CERN LHC. The p edic ed op qua k pai p oduc ion c oss sec ion (σ )in p o on–p o on (pp) collisions, a a cen e-o -mass ene gy o 8TeV, is 253 pb, wi h heo e ical unce ain ies a he le el o 5–6%. A p ecise measu emen o σ is an impo an es o pe u ba i e quan um ch omodynamics (QCD) a high ene - gies. Fu he mo e, p ecision c oss sec ion measu emen s can be used o cons ain he op qua k mass m and QCD pa ame e s, such as he s ong coupling cons an αS[1], o he pa on dis ibu ion unc ions (PDF) o he p o on [2]. The p oduc ion c oss sec ion was measu ed a he LHC a √s=7 and 8 TeV [3–18,18–25]. In his pape , a measu e- men o he p oduc ion c oss sec ion in he inal s a e wi h one high ans e se momen um lep on (muon o elec on) e-mail: [email p o ec ed] and je s is p esen ed using he 2012 da a se a √s=8TeV, collec edby heCMSexpe imen a heLHCandco espond- ing o an in eg a ed luminosi y o 19.6 b−1. To measu e he c oss sec ion a io, whe e se e al sys ema ic unce ain ies cancel, he 2011 da a se a √s=7 TeV, co esponding o an in eg a ed luminosi y o 5.0 b−1, has been concu en ly analyzed wi h a simila s a egy o he one de eloped o he c oss sec ion measu emen a 8TeV. The new measu e- men ag ees e y well wi h he p e iously published CMS esul [8]. The la ge s a is ical unce ain y o he p esen measu emen wi h espec o he p e ious one is due o he simul aneous de e mina ion o he b agging e iciency, as discussed in Sec . 6. Simila ly o he 8 TeV analysis, an addi- ional signal modelling unce ain y has been conside ed in he 7TeV analysis, as epo ed in Sec . 6. In he s anda d model, op qua ks a e p edominan ly p o- duced in pai s ia he s ong in e ac ion and decay almos exclusi ely in o a W boson and a b qua k. The e en sig- na u e is de e mined by he subsequen decays o he wo W bosons. This analysis uses lep on+je s decays in o muons o elec ons, whe e one o he W bosons decays in o wo qua ks and he o he o a lep on and a neu ino. Decays o he W boson in o a au lep on and a neu ino can en e he selec ion i he au lep on decays lep onically. The op qua k decaying in o a b qua k and a lep onically decaying W boson is de ined in he ollowing as he “lep onic op qua k”, while he o he op qua k is e e ed o as “had onic op qua k”. Fo he signal wo je s esul om he had oniza ion o he b and b qua ks (b je s), hus b agging algo i hms a e employed o he iden i ica ion o b je s in o de o imp o e he pu i y o he candida e sample. The echnique o ex ac ing he c oss sec ion consis s o a binned log-likelihood i o signal and backg ound o he dis ibu ion o a disc iminan a iable in da a showing a good sepa a ion be ween signal and backg ound: he in a i- an mass o he b je ela ed o he lep onic op qua k and he lep on (Mb). The mass o he h ee-je combina ion wi h 123 15 Page 2 o 27 Eu . Phys. J. C (2017) 77 :15 he highes ans e se momen um in he e en (M3)isusedas a disc iminan in an al e na i e analysis. The Mb a iable is ela ed o he lep onic op qua k mass, while M3is a measu e o he had onic op qua k mass. Bo h quan i ies p o ide a good sepa a ion be ween signal and backg ound p ocesses. The analysis employs calib a ion echniques o educe he expe imen al unce ain ies ela ed o b agging e iciencies and je ene gy scale (JES). The opology is econs uc ed using a je so ing algo i hm in which he b je mos likely o igina ing om he lep onic op qua k is iden i ied. The b agging e iciency is hen de e mined om a b-en iched sample, in he peak egion o he Mbdis ibu ion, co ec ing o he con amina ion om non-b je s, ollowing he me hod desc ibed in Re s. [26,27]. The a e o je s ha a e w ongly agged as o igina ing om a b qua k is also measu ed using da a as desc ibed in [28]. Independen ly, he JES is de e - mined using he je s associa ed wi h he had onically decay- ing W boson by co ec ing he econs uc ed mass o he W boson in he simula ion o ha de e mined om he da a. The esul s o he c oss sec ion measu emen s a e gi en bo h o he isible egion, i.e. o he phase space co e- sponding o he e en selec ion, and o he ull phase space. The isible egion is de ined by equi ing he p esence in he simula ion o exac ly one lep on, one neu ino, and a leas ou je s passing he selec ion c i e ia, as p esen ed in Sec . 5. This pape is s uc u ed as ollows: a e a desc ip ion o he CMS de ec o (see Sec . 2), he da a and he simula ed samples a e discussed in Sec . 3, while Sec . 4is dedica ed o he e en selec ion. The analysis echnique and he impac o he sys ema ic unce ain ies a e add essed in Sec . 5and in Sec . 6. The esul s o he c oss sec ion measu emen s a e discussed in Sec . 7. Sec ion 8desc ibes he al e na i e analysis based on M3, ollowed by a summa y in Sec . 9. 2 The CMS de ec o The cen al ea u e o he CMS appa a us is a supe conduc - ing solenoid, o 6 m in e nal diame e , p o iding an axial magne ic ield o 3.8 T. Wi hin he solenoidal ield olume a e a silicon pixel and s ip acke which measu e cha ged pa icle ajec o ies in he pseudo apidi y ange |η|<2.5. Also wi hin he ield olume, he silicon de ec o s a e su - oundedbyalead ungs a ec ys alelec omagne iccalo ime- e (|η|<3.0) and a b ass and scin illa o had on calo ime e (|η|<5.0) ha p o ide high- esolu ion ene gy and di ec ion measu emen so elec onsandhad onicje s.Muonsa emea- su ed in gas-ioniza ion de ec o s embedded in he s eel mag- ne ic lux- e u n yoke ou side he solenoid. The muon de ec- ion sys ems p o ide muon de ec ion in he ange |η|<2.4. A wo-le el igge sys em selec s he pp collision e en s o use in physics analysis. A mo e de ailed desc ip ion o he CMS de ec o , oge he wi h a de ini ion o he coo di- na e sys em used and he ele an kinema ic a iables, can be ound elsewhe e [29]. 3 Da a and simula ion The c oss sec ion measu emen is pe o med using he 8TeV pp collisions eco ded by he CMS expe imen in 2012, co - esponding o an in eg a ed luminosi y o 19.6±0.5 b−1 [30], and he 2011 da a se a √s=7 TeV, co esponding o an in eg a ed luminosi y o 5.0±0.2 b −1[31]. The e en s a e simula ed using he Mon e Ca lo (MC) e en gene a o s MadG aph ( e sion 5.1.1.0) [32,33] and powheg ( 1.0 1380) [34,35]. In MadG aph he op qua k pai sa egene a eda leadingo de wi hup o h eeaddi ional high-pTje s. The powheg gene a o implemen s ma ix ele- men s o nex - o-leading o de (NLO) in pe u ba i e QCD, wi h up o one addi ional je . The mass o he op qua k is se o 172.5 GeV. The CT10 [36]PDFse isusedby powheg and he CTEQ6M [37–39]byMadG aph.The py hia ( .6.426) [40] and he wig ( .6.520) [41] gene a o s a e used o model he pa on showe ing. The py hia showe ma ching is done using he MLM p esc ip ion [42,43]. The op qua k pai p oduc ion c oss sec ion alues a e p edic ed o be 177.3+4.6 −6.0(scale) ±9.0(PDF+αS)pb a 7 TeV and 252.9+6.4 −8.6(scale) ±11.7(PDF+αS)pb a 8TeV, as calcula ed wi h he Top++ 2.0 p og am o nex - o-nex - o-leading o de (NNLO) in pe u ba i e QCD, including so -gluon esumma ion o nex - o-nex - o-leading loga i h- mic (NNLL) o de (Re . [44] and e e ences he ein), and assuming m =172.5 GeV. The i s unce ain y comes om he independen a ia ion o he ac o iza ion and eno mal- iza ionscales,while hesecondoneisassocia ed o a ia ions in he PDF and αS ollowing he PDF4LHC p esc ip ion wi h he MSTW2008 68% con idence le el NNLO, CT10 NNLO, and NNPDF2.3 5 FFN PDF se s (Re s. [37,38] and e e - ences he ein, and Re s. [36,39]). The opqua k ans e semomen um is eweigh edinsam- ples simula ed wi h MadG aph and powheg, when in e - aced opy hia,ino de obe e desc ibe he pTdis ibu ion obse ed in he da a. Based on s udies o di e en ial dis i- bu ions [45,46] in he op qua k ans e se momen um, an e en weigh w=√w1w2is applied, whe e he weigh s wi o he wo op qua ks a e gi en as a unc ion o he gene a ed op qua k pT alues: wi=exp(0.199−0.00166 pi T/GeV)a 7TeV, and wi=exp(0.156 −0.00137 pi T/GeV)a 8 TeV. This eweigh ing is only applied o he phase space co e- sponding o he expe imen al selec ions in he muon and elec on channels. The ag eemen be ween da a and samples gene a ed wi h powheg in e aced wi h he wig is ound o be sa is ac o y, and no eweigh ing is applied in his case. The W/Z+je s e en s, i.e. he associa ed p oduc ion o W/Z ec o bosons wi h je s, wi h lep onic decays o he 123 Eu . Phys. J. C (2017) 77 :15 Page 3 o 27 15 W/Z bosons, cons i u e he la ges backg ound. These a e alsosimula edusingMadG aph wi hma ixelemen sco e- sponding o a leas one je and up o ou je s. The W/Z+je s e en sa egene a edinclusi elywi h espec o heje la ou . D ell–Yan p oduc ion o cha ged lep ons is gene a ed o dilep on in a ian masses abo e 50 GeV, as hose e en s con- s i u e he ele an backg ound in he phase space o his anal- ysis. The con ibu ion om D ell–Yan e en s wi h dilep on in a ian masses below 50GeV is negligible, as e i ied wi h a sample wi h a mass ange o 10–50GeV. Single op qua k p oduc ion is simula ed wi h powheg. The backg ound p o- cesses a e no malized o NLO and NNLO c oss sec ion cal- cula ions [47–51], wi h he excep ion o he QCD mul ije backg ound, o which he no maliza ion is ob ained om da a in he M3analysis (see Sec . 8). In he Mbanalysis he mul ije backg ound is educed o a negligible ac ion (see Sec . 4) and hus no conside ed u he . Pileup signals, i.e. ex a ac i i y due o addi ional pp in e - ac ions in he same bunch c ossing, a e inco po a ed by sim- ula ing addi ional in e ac ions wi h a mul iplici y ma ching he one in e ed om da a. The CMS de ec o esponse is modeled using Gean 4 [52]. The simula ed e en s a e p o- cessed by he same econs uc ion so wa e as he collision da a. 4 Recons uc ion and e en selec ion This analysis ocuses on he selec ion o lep on+je s decays in he muon and elec on channels, wi h simila selec ion equi emen s applied o he wo channels. Muons, elec- ons, pho ons, and neu al and cha ged had ons a e econ- s uc ed and iden i ied by he CMS pa icle- low (PF) algo- i hm [53,54]. The ene gy o muons is ob ained om he co - esponding ackmomen umusing hecombinedin o ma ion o he silicon acke and he muon sys em [55]. The ene gy o elec ons is de e mined om a combina ion o he ack momen um in he acke , he co esponding clus e ene gy in he elec omagne ic calo ime e , and he ene gy sum o all b emss ahlung pho ons associa ed o he ack [56]. The e ex wi h he la ges p2 Tsum o he acks associa ed o i is chosen as p ima y e ex. Candida e e en s a e i s accep ed by dedica ed ig- ge s equi ing a leas one muon o elec on. Lep on isola ion equi emen s a e applied o imp o e he pu i y o he selec ed sample. A he igge le el he ela i e muon isola ion, he sum o ans e se momen a o o he pa icles in a cone o size R=√(φ)2+(η)2=0.4 a ound he di ec ion o he candida e muon di ided by he muon ans e se momen um, is equi ed obeless han0.2.Simila ly, o elec ons, heco - esponding equi emen is less han 0.3 in a cone o size 0.3. E en s wi h a muon in he inal s a e a e igge ed on he p es- ence o a muon candida e wi h pT>24 GeV and |η|<2.1. E en swi hanelec oncandida ewi h|η|<2.5a eaccep ed by igge s equi ing an elec on wi h pT>27 GeV. Tigh e pT equi emen s a e applied in he o line selec- ions. Muons a e equi ed o ha e a good quali y [55] ack wi h pT>25 GeV and |η|<2.1. Elec ons a e iden i ied using a combina ion o he showe shape in o ma ion and ack-elec omagne icclus e ma ching[56],anda e equi ed oha e pT>32 GeVand|η|<2.5,wi h heexclusiono he ansi ion egion be ween he ba el and endcap elec omag- ne ic calo ime e , 1.44 <|η|<1.57. Elec ons iden i ied o come om pho on con e sions [56] a e e oed. Co ec- ion ac o s o igge and lep on iden i ica ion e iciencies ha ebeende e mined wi ha ag-and-p obeme hod[57] om da a/simula ioncompa isonasa unc iono helep on pTand η, and a e applied o he simula ion. Signal e en s a e equi ed o ha e a leas one pp in e - ac ion e ex, success ully econs uc ed om a leas ou acks, wi hin limi s on he longi udinal and adial coo di- na es [58], and exac ly one muon, o elec on, wi h an o igin consis en wi h he econs uc ed e ex wi hin limi s on he impac pa ame e s. Since he lep on om he W boson decay is expec ed o be isola ed om o he ac i i y in he e en , iso- la ion equi emen sa eapplied.A ela i eisola ionisde ined as I el =(Icha ged +Ipho on +Ineu al)/pT, whe e pTis he ans e se momen um o he lep on and Icha ged,Ipho on, and Ineu al a e he sums o he ans e se ene gies o he cha ged pa icles, he pho ons, and he neu al pa icles no iden i ied as pho ons, in a cone R<0.4(0.3) o muons (elec ons) a ound he lep on di ec ion, excluding he lep on i sel . The ela i eisola ion I el is equi ed o be less han 0.12 o muons and 0.10 o elec ons. E en s wi h mo e han one lep on can- dida e wi h elaxed equi emen s a e e oed in o de o ejec Z boson o decays in o dilep ons. The missing ene gy in he ans e se plane (Emiss T)is de ined as he magni ude o he p ojec ion on he plane pe - pendicula o he beams o he ec o sum o he momen a o all PF candida es. I is equi ed o be la ge han 30GeV in he muon channel and la ge han 40GeV in he elec on channel, because o he la ge mul ije backg ound. Je s a e clus e ed om he cha ged and neu al pa icles econs uc ed wi h he PF algo i hm, using he an i-kTje algo i hm [59] wi h a adius pa ame e o 0.5. Pa icles iden- i ied as isola ed muons o elec ons a e no used in he je clus e ing. Je ene gies a e co ec ed o nonlinea i ies due o di e en esponses in he calo ime e s and o he di - e ences be ween measu ed and simula ed esponses [60]. Fu he mo e, o accoun o ex a ac i i y wi hin a je cone due o pileup, je ene gies a e co ec ed [53,54] o cha ged had ons ha belong o a e ex o he han he p ima y e ex, and o he amoun o pileup expec ed in he je a ea om neu al je cons i uen s. A leas ou je s a e equi ed wi h pT>40 GeV and |η|<2.5. An addi ional global calib a ion ac o o he je 123 15 Page 4 o 27 Eu . Phys. J. C (2017) 77 :15 0 200 400 600 800 1000 1200 CMS 1400 Da a signal eh o Single W/Z+je s (GeV) je 1 T p 0 50 100 150 200 250 300 350 400 450 500 Da a / MC E en s / 5 GeV 0.6 0.8 1 1.2 (8 TeV) -1 19.6 b 0 500 1000 1500 2000 CMS 2500 Da a langis eh o Single W/Z+je s (GeV) je 2 T p 0 50 100 150 200 250 300 350 400 450 500 Da a / MC E en s / 5 GeV 0.6 0.8 1 1.2 (8 TeV) -1 19.6 b 0 500 1000 1500 2000 CMS 2500 3000 Da a lang i s eh o Single W/Z+je s 0 50 100 150 200 250 300 350 400 450 500 Da a / MC E en s / 5 GeV 0.6 0.8 1 1.2 1 (8 TeV) -1 19.6 b μ T p (GeV) 0 200 400 600 800 1000 1200 CMS 1400 Da a lang i s eh o Single W/Z+je s 0 50 100 150 200 250 300 Da a / MC E en s / 3 GeV 0.6 0.8 1 1.2 (8 TeV) -1 19.6 b (GeV) jmiss T E Fig. 1 T ans e se momen um dis ibu ions o he i s - and second- leading je ( op), he muon and Emiss Tdis ibu ion (bo om) o all ele- an p ocesses in he muon+je s channel wi h he equi emen o a leas one b- agged je . The simula ion is no malized o he s anda d model c oss sec ion alues and pT- eweigh ing is applied o he con ibu- ion. The mul ije backg ound is negligible and no shown. The dis ibu- ions a e al eady co ec ed o he b agging e iciency scale ac o . The hashed a ea shows he unce ain y in he luminosi y measu emen and he b agging sys ema ic unce ain y. The las bin includes he o e low. The a io be ween da a and simula ion is shown in he lowe panels o bins wi h non-ze o en ies.eps ene gy scale is ob ained by i ing he W boson mass dis i- bu ion in he da a and in he simula ion. The scale ac o is de e mined as he a io o he W boson mass econs uc ed om non-b- agged je pai s in da a and in he simula ion. This scale co ec ion is applied in he simula ion o all je s be o e he selec ion equi emen s a e implemen ed. I la gely educes he sys ema ic unce ain y ela ed o he je ene gy scale, discussed in Sec . 6. To educe con amina ion om backg ound p ocesses, a leas oneo he je shas obeiden i iedasabje .Theb agging algo i hm used is he “combined seconda y e ex” (CSV) algo i hm a he medium wo king poin [26,27], co espond- ing o a misiden i ica ion p obabili y o abou 1% o ligh - pa on je s (mis ag a e) and an e iciency o b je s in he ange 60–70% depending on he je pTand pseudo apid- i y. Figu e 1shows kinema ic dis ibu ions a e applying he b agging equi emen . Good ag eemen be ween da a and simula ion is obse ed. The Mbanalysis uses con ol samples in da a o he es i- ma ion o he b agging e iciency, as desc ibed in Re s. [26– 28]. Among he ou leading je s, h ee a e assigned o he had onically decaying op qua k h ough a χ2so ing algo- i hm using op qua k and W boson mass cons ain s. The emaining ou h je is he b je candida e assigned o he 123 Eu . Phys. J. C (2017) 77 :15 Page 5 o 27 15 (GeV) bμ M 0 50 100 150 200 250 300 350 400 450 500 E en s / 10 GeV 0 500 CMS 1000 1500 2000 2500 Da a Backg ound /nd = 0.92 2 χFi (8TeV) -1 19.6 b (GeV) eb M 0 50 100 150 200 250 300 350 400 450 500 E en s / 10 GeV 0 200 400 CMS 600 800 1000 1200 1400 1600 1800 Da a Backg ound /nd = 0.73 2 χFi (8 TeV) -1 19.6 b Fig. 2 Dis ibu ions o he lep on-je mass in he muon+je s (le ) and elec on+je s ( igh ) channels, escaled o he i esul s lep onically decaying op qua k. The b agging algo i hm is only applied o his b je candida e. Owing o di e ences in he igge s and in he cen e-o - mass ene gies, in he 7 TeV analysis sligh ly di e en selec- ion c i e ia a e applied on he lep on pTand Emiss T.The muon ans e se momen um is equi ed o be la ge han 26GeV, while he elec on pThas o be la ge han 30GeV. No explici Emiss T equi emen is needed in he muon chan- nel. E en s wi h Emiss T>30 GeV a e selec ed in he elec on channel. 5 Visible and o al c oss sec ion measu emen s The numbe o e en s is de e mined wi h a binned maximum-likelihood i o dis ibu ions ( empla es), desc ib- ingsignaland backg ound p ocesses, o heda asample pass- ing he inal selec ion, by i ing Mb, he in a ian mass dis- ibu ion o he b je and he lep on. The isible (σ is ) and o al (σ ) p oduc ion c oss sec- ions a e ex ac ed om he numbe o e en s obse ed in he da a using he equa ions σ is =N Lε ,σ =σ is A,(1) whe e N is he numbe o e en s (including bo h signal e en s om he lep on+je s channel conside ed and e en s om o he decay channels) ex ac ed om he i , Lis he in eg a ed luminosi y, Ais he accep ance, and ε is he selec ion e iciency wi hin he accep ance equi emen s ou - lined in he nex sec ion. Resul s a e p esen ed o bo h he isible and o al c oss sec ion, in o de o sepa a e expe i- men al unce ain ies om heo e ical assump ions as much as possible. One empla e is used o e en s (bo h o he signal e en s and he o he e en s passing he selec ion c i e ia) and one empla e o all backg ound p ocesses (W/Z+je s and single op qua k p oduc ion). The i is pe o med in he ange 0–500 GeV. Figu e 2shows he esul s o he i o he da a dis ibu ions in he muon and elec on channels. 5.1 Accep ance The accep ance Aco esponding o he isible phase space depends on he heo e ical model and i is de e mined a he gene a o le el by equi ing he p esence o exac ly one lep- on, one neu ino, and a leas ou je s, passing pTand |η| selec ion c i e ia simila o he ones delinea ed in Sec . 4. Fo simplici y a single accep ance de ini ion, co esponding o he igh es selec ion c i e ia, is used o bo h channels a each cen e-o -mass ene gy: exac ly one muon, o elec- on, wi h pT>32 GeV and |η|<2.1, one neu ino wi h pT>40 GeV, and a leas ou je s wi h pT>40 GeV and |η|<2.5. The accep ance alues include con ibu ions om o he decay channels, in pa icula om he dilep on channel, a he le el o abou 9%. The accep ance alues a e p o ided in Table 1 o he wo gene a o s used in his analysis, MadG aph and powheg. The accep ance alues a e in ag eemen a he 1–2% le el a 8TeV and a be e han 5% a 7 TeV. This di e en le el o ag eemen is due o he ac ha he common accep ance de ini ion desc ibed abo e co esponds he igh es pTc i- e ia, i.e. o he pT equi emen s o he elec on channel a √s=8TeV. The eweigh ed accep ance is de e mined as he numbe o eweigh ed e en s in he isible phase space, 123 15 Page 6 o 27 Eu . Phys. J. C (2017) 77 :15 Table 1 A e age accep ance alues o he muon and elec on channels ob ained wi h MadG aph and powheg a √s=7 and 8 TeV, wi hou and wi h op qua k pT- eweigh ing applied. The s a is ical unce ain y is 0.0004, i.e. below 3%. The heo e ical unce ain ies a e a he le el o 2%, as discussed in he ex A(√s=7TeV) A(√s=8TeV) No ew. Wi h ew. No ew. Wi h ew. MadG aph 0.0158 0.0156 0.0166 0.0162 powheg 0.0151 0.0149 0.0163 0.0161 i.e. he sum o he weigh s, di ided by he o al numbe o (non- eweigh ed) e en s. The s a is ical unce ain y in he accep ance calcula ions is below 3%. The heo e ical sys ema ic unce ain ies e alu- a ed by a ying he PDFs (Sec . 6) o he ma ching h esholds a e in he ange 0.1–0.2%. Va ia ion o he ac o iza ion and eno maliza ion scale induces a a ia ion o up o 2% in he accep ance. These a ia ions a e al eady included in he sys- ema ic unce ain ies quo ed in Sec . 6. In he ollowing, op qua k pT- eweigh ing [45,46]is always applied o he isible phase space as i p o ides a be e ag eemen be ween da a and simula ion. On he o he hand, gi en ha he e en weigh s we e only de e mined in he phase space co esponding o he expe imen al selec ion, hey ha e no been used o he ex apola ion o he o al c oss sec ion. The e o e, he non- eweigh ed accep ance is used o de e mine he o al c oss sec ion. Howe e , escaling by he a io o he alues p o ided in Table 1would allow a de e mina ion o he o al c oss sec ion wi h he eweigh ed accep ance. The isible c oss sec ion does no depend on he accep ance A. 5.2 Selec ion e iciency Theselec ione iciencywi hin heaccep ance,ε ,is epo ed in Table 2. I is de e mined om he pT- eweigh ed Mad- G aph simula ed sample as he numbe o e en s pass- ing he selec ion c i e ia ou lined in Sec . 4, o e he num- be o e en s passing he accep ance equi emen s de ined abo e. The selec ion e iciency includes he e ec s o ig- ge equi emen s, lep on and je iden i ica ion c i e ia, and b agging e iciency, which is di ec ly de e mined om da a. A signal selec ion e iciency wi hin accep ance o 32% in he muonchannel and21% in he elec on channel is de e mined. Simila alues (37 and 22%, espec i ely) a e ob ained a √s=7TeV. Fo he muon channel he common accep- ance equi emen s used o bo h channels a e igh e han he selec ion equi emen s, hus he muon channel e iciency is signi ican ly la ge han he elec on channel e iciency. The selec ion e iciency, Aε , is he numbe o selec ed e en s ou o all p oduced pai s, in all decay channels. 6 Sys ema ic unce ain ies Sys ema ic unce ain ies a e de e mined by a ying each sou ce wi hin i s es ima ed unce ain y and by p opaga ing he a ia ion o he c oss sec ion measu emen s. Templa e shapes and signal e iciencies a e a ied oge he acco ding o he sys ema ic unce ain y conside ed. The unce ain y is gi en by he shi in he i ed c oss sec ion and is c oss- checkedby epea ing i s es ima ion wi h pseudo-expe imen s using simula ion. The sys ema ically a ied empla e shapes a e i o pseudo-da a gene a ed using he nominal em- pla e shapes and no maliza ions. The alida ion wi h pseudo- expe imen s shows ha he i pe o ms as expec ed. All sys- ema ic unce ain ies, excep he ones ela ed o b agging and o he es ima ion o he mul ije backg ound, a e common o bo h he Mband he M3measu emen s. The e ec o unce ain ies in he JES is e alua ed by a ying he JES wi hin he pT- and η-dependen unce ain- ies gi en in Re . [60]. The inal JES o he simula ion is ma ched o ha in da a by applying an addi ional global co - ec ion ac o α o all je momen a be o e selec ion. The α calib a ion alues a e indi idually de e mined o nominal condi ions and o each o he a ia ions ela ed o JES and JER. In addi ion o he selec ion desc ibed in Sec . 4, wob- agged je s a e equi ed in o de o inc ease he signal pu i y. The mass o he had onically decaying W boson is econ- s uc ed as he dije in a ian mass om all combina ions o non b- agged je s. The dije in a ian mass dis ibu ions a e i ed in da a and in simula ion wi h a unc ion desc ibing he W boson signal peak and he dije combina o ial back- g ound. The α alues a e de e mined as he a ios o he i ed W boson masses in da a and in simula ion. In he Mbanaly- sis α=1.011 ±0.004 is ob ained wi h he nominal samples bo h in he muon and elec on channels, wi h a ia ions o he o de o ±1.5% o he samples wi h down and up a ia- Table 2 Signal selec ion e iciencies, a √s=8TeV, de e mined om simula ion using MadG aph.The non- eweigh ed accep ance om Table 1is used. The ela i e s a is ical unce ain y on ε is below 3% Channel ε (√s=7TeV) (%) Aε (√s=7 TeV) (%) ε (√s=8 TeV) (%) Aε (√s=8 TeV) (%) μ+je s 37 0.58 32 0.53 e+je s 22 0.36 21 0.35 123 Eu . Phys. J. C (2017) 77 :15 Page 7 o 27 15 Table 3 Componen s (in %) o he JES unce ain y a 8 TeV in he muon and elec on channels. The co ela ion coe icien s used in hei combina ion a e also shown Sou ce μ+je s e+je s Co ela ion Absolu e scale ±0.33 ±0.40 0.0 Global je scale ac o α±0.59 ±0.39 0.0 Rela i e FSR ±0.46 ±0.41 1.0 Rela i e pT±0.67 ±0.57 1.0 Fla ou JES ±1.84 ±1.79 1.0 Fla ou JES agmen a ion ±0.50 ±0.46 1.0 Fla ou JES semilep onic BR ±0.11 ±0.16 1.0 High-pTex a ±0.18 ±0.23 1.0 Single pion ±0.21 ±0.27 1.0 Pileup ±0.35 ±0.31 1.0 Time ±0.17 ±0.24 1.0 To al JES ±2.23 ±2.13 0.9 ions o he JES. The same alues a e de e mined by he M3 analysis. This addi ional calib a ion educes he size o he JES sys ema ic unce ain y by app oxima ely 60%. The JES unce ain y, epo ed in Table 3, consis s o se e al sou ces, all p opaga ed indi idually. De ails o he indi idual con i- bu ions a e explained in [61]. The impac o he je ene gy esolu ion (JER) is es i- ma ed by applying η-dependen a ia ions wi h an a e - age o ±10%. The JES and JER a ia ions a e p opaga ed o he Emiss T. In addi ion, he con ibu ion o Emiss Ta ising om ene gy deposi ions no con ained in je s is a ied by ±10% [60]. The unce ain y ela ed o he pileup modelling is de e mined by p opaga ing a ±5% a ia ion [62] o he cen al alue o he inelas ic c oss sec ion. Va ia ions in he composi ion o he main backg ound p ocesses, W+je s and Z+je s, a e conse a i ely e alua ed by a ying inde- penden ly hei c oss sec ions by ±30% [63–65]. Addi ional unce ain ies on he hea y la ou componen in W/Z+je s p oduc ion a e no explici ly aken in o accoun and a e assumed o be co e ed by he 30% unce ain y. The a ia ion o he no maliza ion o he single op qua k backg ound by 30% gi es a negligible con ibu ion. The igge e iciency and lep on iden i ica ion co ec ion ac o s a e de e mined wi h a ag-and-p obe me hod [57] in dilep on e en s and a e a ied wi hin hei pT- and η-dependen unce ain ies. Unce ain ies om heb agginge iciencyandmis ag a e a ee alua edin he M3analysisby a ying heco ec ion ac- o swi hin hei unce ain ies[26,27] quo edin Sec . 8.In he Mbanalysis, on he o he hand, he b agging e iciency o b je s is measu ed om da a, using he echnique desc ibed in Re s. [26–28], on he same selec ed e en sample as ha o he c oss sec ion de e mina ion, bu be o e b agging. The Mb a iable is used no only as a c oss sec ion es ima o , bu also as a b agging disc imina o . The s a is ical and sys- ema ic unce ain ies in he b agging and mis ag e iciencies a e p opaga ed o he s a is ical and sys ema ic unce ain- ies in he c oss sec ion measu emen s. Fo his eason he s a is ical unce ain y ob ained by he Mbanalysis is la ge han he one o he M3analysis. A sys ema ic unce ain y is assigned o he choice, based on simula ion, o he b-en iched ( o Mb alues below 140 GeV) and o he b-deple ed ( o Mbin he ange 140–240 GeV) egions, by shi ing he win- dows by ±30 GeV. Since he b agging e iciency and mis ag a e a e de i ed om da a and since hey a e e-de e mined when e alua ing he e ec o he a ious sys ema ic unce - ain ies, no addi ional unce ain ies a e included. The me hod is shown [26–28] o be s able o di e en b agging algo- i hms and wo king poin s. Theo e ical unce ain ies a e aken om de ailed s udies pe o med on simula ed samples. They include he common ac o iza ion and eno maliza ion scales, which a e a ied by a ac o o 1/4 and 4 om he de aul alue equal o he Q2 o he o W/Z+je e en s. The e ec o he je -pa on ma ch- ing h eshold on and W+je s e en s is s udied by a ying he h eshold used o ma ching he ma ix elemen le el o he pa icles c ea ed in he pa on showe ing by a ac o o 0.5 o 2. Unce ain ies om he choice o PDF a e e alua ed by using he Hessian me hod [66] wi h he pa ame e s o he CTEQ6.6 PDF se [67]. O he PDF se s (including hei unce ain ies) yield e y simila esul s. The PDFs and hei unce ain ies a e de e mined om a i o collision da a yield- ing he Hessian ma ix. Each o he 22 eigen ec o s ob ained by diagonalizing he ma ix is a ied wi hin i s unce ain- ies. The di e ences wi h espec o he nominal p edic ion a e de e mined independen ly o each eigen ec o and a e added in quad a u e. The sys ema ic unce ain y due o he op qua k pT- eweigh ing p ocedu e desc ibed in Sec . 3is e alua ed as he di e ence wi h espec o he measu emen ob ained wi h he non- eweigh ed sample. Only he a ia ion due o he empla e shape is conside ed, as he co ec ion is mean o modi y he shape only. A “signal modelling” unce ain y is a ibu ed o he choice o he gene a o s. I comp ises changes in ma ix elemen and pa on showe implemen a ion. The e ec o he ma ix elemen gene a o is e alua ed by using powheg (ins ead o MadG aph) in e aced o py hia, while he pa - on showe modelling is e alua ed wi h powheg and he wig ins ead o powheg and py hia. Rega ding he wo co e- sponding unce ain ies, he o me is always posi i e and he la e is always nega i e. Fo 7 TeV he same alues de e - mined o 8 TeV a e used. As discussed in Sec . 7, he “signal modelling” unce ain y is symme ized by aking he la ge o he wo con ibu ions (±4.4%). An unce ain y o 2.6% [30] (2.2% [31]) is assigned o he de e mina ion o he 2012 (2011) in eg a ed luminosi y. The esul ing e ec s om all sou ces a e added in quad a- u e. Tables 4and 5p o ide an o e iew o he con ibu ions 123 15 Page 8 o 27 Eu . Phys. J. C (2017) 77 :15 Table 4 O e iew o he sys ema ic unce ain ies in he measu emen o he c oss sec ions a 8 TeV, bo h o he o al and he isible c oss sec ions. Fo he “signal modelling” unce ain y he la ge be ween he ma ix elemen (ME) and pa on showe (PS) unce ain ies is aken, as explained in Sec . 6. The co ela ions assumed o he combina ion o he muon and elec on channels a e also gi en Sys ema ic unce ain y 8 TeV μ+je s (%) e+je s (%) co . comb.(%) Je ene gy scale ±2.2±2.10.9±2.2 Je ene gy esolu ion ±0.8±0.91.0±0.8 Emiss Tunclus e ed ene gy ±0.1±0.31.0±0.1 Pileup ±0.5±0.41.0±0.5 Lep on ID / T igge e . co ec ions ±0.4±0.50.0±0.5 b agging me hod ±0.3±0.71.0±0.3 Backg ound composi ion ±0.2±0.31.0±0.2 Fac o iza ion/ eno maliza ion scales ±1.7±2.61.0±1.7 ME-PS ma ching h eshold ±1.3±2.31.0±1.2 Top qua k pT- eweigh ing ±1.1±1.21.0±1.1 Signal modelling o σ (σ is )±4.4(±2.2)±4.4(±2.4)1.0 ±4.4(±2.3) PDF unce ain ies ±2.1±1.91.0±2.1 Sum o σ (σ is )±6.0(±4.6)±6.5(±5.4)±6.0(±4.7) In eg a ed luminosi y ±2.6±2.61.0±2.6 To al o σ (σ is )±6.5(±5.3)±7.0(±6.0)±6.5(±5.3) Table 5 O e iew o he sys ema ic unce ain ies in he measu emen o he c oss sec ions a 7 TeV, bo h o he o al and he isible c oss sec ions. Fo he “signal modelling” unce ain y he la ge be ween he ma ix elemen (ME) and pa on showe (PS) unce ain ies is aken, as explained in Sec . 6. The co ela ions assumed o he combina ion o he muon and elec on channels a e also shown. Sys ema ic unce ain y 7 TeV μ+je s (%) e+je s (%) co . comb.(%) Je ene gy scale ±4.8±5.20.9±4.4 Je ene gy esolu ion ±1.4±1.11.0±1.1 Emiss Tunclus e ed ene gy <0.05 ±0.31.0±0.2 Pileup ±0.4±0.61.0±0.5 Lep on ID/ igge e . co ec ions ±1.4±1.70.0±0.8 b agging me hod ±0.5±0.61.0±0.6 Backg ound composi ion ±0.5±0.41.0±0.5 Fac o iza ion/ eno maliza ion scales ±3.7±0.41.0±2.1 ME-PS ma ching h eshold ±2.0±1.71.0±1.8 Top qua k pT- eweigh ing ±1.1±1.21.0±1.1 Signal modelling o σ (σ is )±4.4(±2.2)±4.4(±2.4)1.0 ±4.4(±2.3) PDF unce ain ies ±2.3±1.91.0±2.2 Sum o σ (σ is )±8.4(±7.5)±7.7(±6.8)±7.4(±6.4) In eg a ed luminosi y ±2.2±2.21.0±2.2 To al o σ (σ is )±8.7(±7.8)±8.0(±7.1)±7.7(±6.7) o he sys ema ic unce ain y on he combined c oss sec ion measu emen s in he Mbmeasu emen s a 7 and 8 TeV. 7 Resul s and combina ion The esul s in he muon and elec on channels, shown in Tables 6and 7, a e in good ag eemen . The combina ion o he channel esul s is pe o med using he bes linea unbi- ased es ima o (BLUE) me hod [68–70]. Asymme ic sys- ema ic unce ain ies a e symme ized o he use wi h BLUE by aking hal o he ull ange, excep o he “signal mod- elling” unce ain y, whe e he maximum, 4.4%, is aken o σ . Full co ela ion is assumed o all sys ema ic unce ain- iesbe ween he wochannels,excep o lep oniden i ica ion and igge unce ain ies, which a e assumed o be unco e- la ed. Owing o he addi ional je ene gy calib a ion om da a, a co ela ion coe icien o 0.9 is ob ained o he o e all JES unce ain y. This co ela ion is de e mined om he co e- la ion coe icien s in Table 3and i is compa ible wi h he alue in e ed by compa ing he combined esul wi h and 123 Eu . Phys. J. C (2017) 77 :15 Page 9 o 27 15 Table 6 Visible c oss sec ion measu emen s a √s=7and 8 TeV wi h he e e ence analysis Mband he al e na i e analysis M3(desc ibed in Sec . 8). Resul s ob ained o m =172.5GeVwi h MadG aph and wi h powheg a e shown. The unce ain ies a e in he o de : s a is ical, sys ema ic, and due o he luminosi y de e mina ion Analysis Gene a o Channel σ is a √s=8TeV MbMadG aph μ+je s 3.80 ±0.06 ±0.18 ±0.10 pb e+je s 3.90 ±0.07 ±0.21 ±0.10 pb Combined 3.80 ±0.06 ±0.18 ±0.10 pb Mbpowheg Combined 3.83 ±0.06 ±0.18 ±0.10 pb M3MadG aph μ+je s 3.79 ±0.05 ±0.24 ±0.10 pb e+je s 3.75 ±0.04 ±0.26 ±0.10 pb Combined 3.78 ±0.04 ±0.25 ±0.10 pb M3powheg Combined 3.88 ±0.05 ±0.27 ±0.10 pb Analysis Gene a o Channel σ is a √s=7TeV MbMadG aph μ+je s 2.48 ±0.09 ±0.19 ±0.06 pb e+je s 2.62 ±0.10 ±0.18 ±0.06 pb Combined 2.55 ±0.09 ±0.18 ±0.06 pb Table 7 To al c oss sec ion measu emen s a √s=7and 8 TeV wi h he e e ence analysis Mband he al e na i e analysis M3(desc ibed in Sec . 8). Resul s ob ained o m =172.5GeVwi h MadG aph and wi h powheg a e shown. The unce ain ies a e in he o de : s a is ical, sys ema ic, and due o he luminosi y de e mina ion. Analysis Gene a o Channel σ a √s=8TeV MbMadG aph μ+je s 228.9±3.4±13.7±6.0pb e+je s 234.6±3.9±15.2±6.2pb Combined 228.5±3.8±13.7±6.0pb Mbpowheg Combined 237.1±3.9±14.2±6.2pb M3MadG aph μ+je s 228.7±2.6±19.0±6.0pb e+je s 225.8±2.4±19.1±5.9pb Combined 227.1±2.5±19.1±6.0pb M3powheg Combined 238.4±2.8±20.0±6.2pb Analysis Gene a o Channel σ a √s=7TeV MbMadG aph μ+je s 157.7±5.5±13.2±3.4pb e+je s 165.8±6.5±12.8±3.6pb Combined 161.7±6.0±12.0±3.6pb wi hou he addi ional calib a ion. Va ying he JES co ela- ion coe icien be ween 0 and 1 has only a mino e ec on he combined esul s. Fo example, he o al c oss sec ion a 8TeV a ies by less han 0.5%, and he c oss sec ion a io a ies only by app oxima ely 0.1%. A combina ion based on he ela i e s a is ical p ecision o he wo channels would also yield compa ible esul s. Va ia ions o he co ela ions o o he expe imen al sys ema ic unce ain ies ha e negligi- ble e ec on he combined esul s. The in eg a ed luminosi y and he pileup unce ain ies a e assumed o be ully co ela ed be ween channels a he same cen e-o -mass ene gy, and unco ela ed be ween 7 and 8TeV o he c oss sec ion a io. 7.1 Resul s a √s=8TeV The isible c oss sec ion ob ained om he i o he Mb dis ibu ion, using MadG aph signal empla es o m = 172.5GeV,is σ is (combined) =3.80 ±0.06(s a ) ±0.18 (sys ) ±0.10 (lumi) pb. The s a is ical unce ain y includes he con ibu ion om he simul aneous de e mina ion o he b agging e iciency (see Sec . 6). The e is excellen ag eemen wi h he measu emen o he isible c oss sec ion using powheg o he e iciency wi hin he kinema ic accep ance selec ed by his analysis. Using he accep ance alues o Table 1, he isible c oss sec ion measu emen s in he elec on and muon channels a e i s ex apola ed o he ull phase space and hen combined o ob ain he ollowing o al c oss sec ion measu emen σ (combined) =228.5±3.8(s a ) ±13.7 (sys ) ±6.0(lumi)pb. Themeasu emen sa eingoodag eemen wi h he heo e ical p edic ion σ h. (8TeV)=252.9+6.4 −8.6(scale) ±11.7(PDF+αS)pb (see Sec . 3), o m =172.5GeV. 123 15 Page 16 o 27 Eu . Phys. J. C (2017) 77 :15 Ins i u e o High Ene gy Physics, Beijing, China M. Ahmad, J. G. Bian, G. M. Chen, H. S. Chen, M. Chen, T. Cheng, R. Du, C. H. Jiang, R. Ples ina9,F.Romeo, S. M. Shaheen, A. Spiezia, J. Tao, C. Wang, Z. Wang, H. Zhang S a e Key Labo a o y o Nuclea Physics and Technology, Peking Uni e si y, Beijing, China C. Asawa ang akuldee, Y. Ban, Q. Li, S. Liu, Y. Mao, S. J. Qian, D. Wang, Z. Xu Uni e sidad de Los Andes, Bogo a, Colombia C. A ila, A. Cab e a, L. F. Chapa o Sie a, C. Flo ez, J. P. Gomez, B. Gomez Mo eno, J. C. Sanab ia Facul y o Elec ical Enginee ing, Mechanical Enginee ing and Na al A chi ec u e, Uni e si y o Spli , Spli , C oa ia N. Godino ic, D. Lelas, I. Puljak, P. M. Ribei o Cip iano Facul y o Science, Uni e si y o Spli , Spli , C oa ia Z. An uno ic, M. Ko ac Ins i u e Rudje Bosko ic, Zag eb, C oa ia V. B iglje ic, K. Kadija, J. Lue ic, S. Micano ic, L. Sudic Uni e si y o Cyp us, Nicosia, Cyp us A. A ikis, G. Ma omanolakis, J. Mousa, C. Nicolaou, F. P ochos, P. A. Razis, H. Rykaczewski Cha les Uni e si y, P ague, Czech Republic M. Bodlak, M. Finge 10, M. Finge J .10 Academy o Scien i ic Resea ch and Technology o he A ab Republic o Egyp , Egyp ian Ne wo k o High Ene gy Physics, Cai o, Egyp A. A. Abdelalim11,12,A.Awad 13,14,M.ElSawy 14,15, A. Mah ous11, A. Radi13,14 Na ional Ins i u e o Chemical Physics and Biophysics, Tallinn, Es onia B. Calpas, M. Kadas ik, M. Mu umaa, M. Raidal, A. Tiko, C. Veelken Depa men o Physics, Uni e si y o Helsinki, Helsinki, Finland P. Ee ola, J. Pekkanen, M. Vou ilainen Helsinki Ins i u e o Physics, Helsinki, Finland J. Hä könen, V. Ka imäki, R. Kinnunen, T. Lampén, K. Lassila-Pe ini, S. Leh i, T. Lindén, P. Luukka, T. Mäenpää, T. Pel ola, E. Tuominen, J. Tuominiemi, E. Tuo inen, L. Wendland Lappeen an a Uni e si y o Technology, Lappeen an a, Finland J. Tal i ie, T. Tuu a DSM/IRFU, CEA/Saclay, Gi -su -Y e e, F ance M. Besancon, F. Coude c, M. Deja din, D. Deneg i, B. Fabb o, J. L. Fau e, C. Fa a o, F. Fe i, S. Ganjou , A. Gi e naud, P. G as, G. Hamel de Monchenaul , P. Ja y, E. Locci, M. Mache , J. Malcles, J. Rande , A. Rosowsky, M. Ti o , A. Zghiche Labo a oi e Lep ince-Ringue , Ecole Poly echnique, IN2P3-CNRS, Palaiseau, F ance I. An opo , S. Ba ioni, F. Beaude e, P. Busson, L. Cadamu o, E. Chapon, C. Cha lo , T. Dahms, O. Da ignon, N. Filipo ic, A. Flo en , R. G anie de Cassagnac, S. Lisniak, L. Mas olo enzo, P. Miné, I. N. Na anjo, M. Nguyen, C. Ochando, G. O ona, P. Paganini, P. Piga d, S. Regna d, R. Sale no, J. B. Sau an, Y. Si ois, T. S eble , Y. Yilmaz, A. Zabi Ins i u Plu idisciplinai e Hube Cu ien, Uni e si é de S asbou g, Uni e si é de Hau e Alsace Mulhouse, CNRS/IN2P3, S asbou g, F ance J.-L. Ag am16, J. And ea, A. Aubin, D. Bloch, J.-M. B om, M. Bu ignol, E. C. Chabe , N. Chanon, C. Colla d, E. Con e16, X. Coubez, J.-C. Fon aine16, D. Gelé, U. Goe lach, C. Goe zmann, A.-C. Le Bihan, J. A. Me lin2, K. Sko pen, P. Van Ho e 123 Eu . Phys. J. C (2017) 77 :15 Page 17 o 27 15 Cen e de Calcul de l’Ins i u Na ional de Physique Nucleai e e de Physique des Pa icules, CNRS/IN2P3, Villeu banne, F ance S. Gad a Uni e si é de Lyon, Uni e si é Claude Be na d Lyon 1, CNRS-IN2P3, Ins i u de Physique Nucléai e de Lyon, Villeu banne, F ance S. Beauce on, C. Be ne , G. Boudoul, E. Bou ie , C. A. Ca illo Mon oya, R. Chie ici, D. Con a do, B. Cou bon, P. Depasse, H. El Mamouni, J. Fan, J. Fay, S. Gascon, M. Gouze i ch, B. Ille, F. Laga de, I. B. Lak ineh, M. Le huillie , L. Mi abi o, A. L. Pequegno , S. Pe ies, J. D. Ruiz Al a ez, D. Sabes, L. Sgandu a, V. So dini, M. Vande Donck , P. Ve die , S. Vi e Geo gian Technical Uni e si y, Tbilisi, Geo gia T. To iash ili17 Tbilisi S a e Uni e si y, Tbilisi, Geo gia Z. Tsamalaidze10 I. Physikalisches Ins i u , RWTH Aachen Uni e si y, Aachen, Ge many C. Au e mann, S. Be anek, M. Edelho , L. Feld, A. Heis e , M. K. Kiesel, K. Klein, M. Lipinski, A. Os apchuk, M. P eu en, F. Raupach, S. Schael, J. F. Schul e, T. Ve lage, H. Webe , B. Wi me , V. Zhuko 6 III. Physikalisches Ins i u A, RWTH Aachen Uni e si y, Aachen, Ge many M. A a, M. B odski, E. Die z-Lau sonn, D. Ducha d , M. End es, M. E dmann, S. E dweg, T. Esch, R. Fische , A. Gü h, T. Hebbeke , C. Heidemann, K. Hoep ne , D. Klingebiel, S. Knu zen, P. K euze , M. Me schmeye , A. Meye , P. Mille , M. Olschewski, K. Padeken, P. Papacz, T. Pook, M. Radziej, H. Rei hle , M. Riege , F. Scheuch, L. Sonnenschein, D. Teyssie , S. Thüe III. Physikalisches Ins i u B, RWTH Aachen Uni e si y, Aachen, Ge many V. Che epano , Y. E dogan, G. Flügge, H. Geenen, M. Geisle , F. Hoehle, B. Ka goll, T. K ess, Y. Kuessel, A. Künsken, J. Lingemann2, A. Neh ko n, A. Nowack, I. M. Nugen , C. Pis one, O. Poo h, A. S ahl Deu sches Elek onen-Synch o on, Hambu g, Ge many M. Aldaya Ma in, I. Asin, N. Ba osik, O. Behnke, U. Beh ens, A. J. Bell, K. Bo as18, A. Bu gmeie , A. Campbell, S. Choudhu y19, F. Cos anza, C. Diez Pa dos, G. Dolinska, S. Dooling, T. Do land, G. Ecke lin, D. Ecks ein, T. Eichho n, G. Flucke, E. Gallo20, J. Ga ay Ga cia, A. Geise , A. Gizhko, P. Gunnellini, J. Hauk, M. Hempel21, H. Jung, A. Kaloge opoulos, O. Ka acheban21, M. Kasemann, P. Ka sas, J. Kiesele , C. Kleinwo , I. Ko ol, W. Lange, J. Leona d, K. Lipka, A. Lobano , W. Lohmann21, R. Mankel, I. Ma in21, I.-A. Melze -Pellmann, A. B. Meye , G. Mi ag, J. Mnich, A. Mussgille , S. Naumann-Emme, A. Nayak, E. N oma i, H. Pe ey, D. Pi zl, R. Placaky e, A. Raspe eza, B. Roland, M. Ö. Sahin, P. Saxena, T. Schoe ne -Sadenius, M. Sch öde , C. Sei z, S. Spannagel, K. D. T ippkewi z, R. Walsh, C. Wissing Uni e si y o Hambu g, Hambu g, Ge many V. Blobel, M. Cen is Vignali, A. R. D aege , J. E le, E. Ga u i, K. Goebel, D. Gonzalez, M. Gö ne , J. Halle , M. Ho mann, R. S. Höing, A. Junkes, R. Klanne , R. Kogle , N. Ko alchuk, T. Lapsien, T. Lenz, I. Ma chesini, D. Ma coni, M. Meye , D. Nowa schin, J. O , F. Pan aleo2, T. Pei e , A. Pe ieanu, N. Pie sch, J. Poehlsen, D. Ra hjens, C. Sande , C. Scha , H. Sche le , P. Schlepe , E. Schlieckau, A. Schmid , J. Schwand , V. Sola, H. S adie, G. S einb ück, H. Tholen, D. T oendle, E. Usai, L. Vanelde en, A. Vanhoe e , B. Vo mwald Ins i u ü Expe imen elle Ke nphysik, Ka ls uhe, Ge many M. Akbiyik, C. Ba h, C. Baus, J. Be ge , C. Böse , E. Bu z, T. Chwalek, F. Colombo, W. De Boe , A. Desc oix, A. Die lamm, S. Fink, F. F ensch, R. F iese, M. Gi els, A. Gilbe , D. Hai z, F. Ha mann2, S. M. Heindl, U. Husemann, I. Ka ko 6, A. Ko nmaye 2, P. Lobelle Pa do, B. Maie , H. Mildne , M. U. Moze , T. Mülle , Th. Mülle , M. Plagge, G. Quas , K. Rabbe z, S. Röcke , F. Rosche , G. Siebe , H. J. Simonis, F. M. S obe , R. Ul ich, J. Wagne -Kuh , S. Wayand, M. Webe , T. Weile , C. Wöh mann, R. Wol Ins i u e o Nuclea and Pa icle Physics (INPP), NCSR Demok i os, Aghia Pa aske i, G eece G. Anagnos ou, G. Daskalakis, T. Ge alis, V. A. Giakoumopoulou, A. Ky iakis, D. Loukas, A. Psallidas, I. Topsis-Gio is 123 15 Page 18 o 27 Eu . Phys. J. C (2017) 77 :15 Na ional and Kapodis ian Uni e si y o A hens, A hens, G eece A. Agapi os, S. Kesisoglou, A. Panagio ou, N. Saoulidou, E. Tzia e i Uni e si y o Ioánnina, Ioánnina, G eece I. E angelou, G. Flou is, C. Foudas, P. Kokkas, N. Loukas, N. Man hos, I. Papadopoulos, E. Pa adas, J. S ologas Wigne Resea ch Cen e o Physics, Budapes , Hunga y G. Bencze, C. Hajdu, A. Hazi, P. Hidas, D. Ho a h22, F. Sikle , V. Veszp emi, G. Vesz e gombi23, A. J. Zsigmond Ins i u e o Nuclea Resea ch ATOMKI, Deb ecen, Hunga y N. Beni, S. Czella , J. Ka ancsi24, J. Molna , Z. Szillasi Uni e si y o Deb ecen, Deb ecen, Hunga y M. Ba ók25, A. Mako ec, P. Raics, Z. L. T ocsanyi, B. Uj a i Na ional Ins i u e o Science Educa ion and Resea ch, Bhubaneswa , India P. Mal, K. Mandal, D. K. Sahoo, N. Sahoo, S. K. Swain Panjab Uni e si y, Chandiga h, India S. Bansal, S. B. Be i, V. Bha naga , R. Chawla, R. Gup a, U. Bhawandeep, A. K. Kalsi, A. Kau , M. Kau , R. Kuma , A. Meh a, M. Mi al, J. B. Singh, G. Walia Uni e si y o Delhi, Delhi, India Ashok Kuma , A. Bha dwaj, B. C. Choudha y, R. B. Ga g, A. Kuma , S. Malho a, M. Naimuddin, N. Nishu, K. Ranjan, R. Sha ma, V. Sha ma Saha Ins i u e o Nuclea Physics, Kolka a, India S. Bha acha ya, K. Cha e jee, S. Dey, S. Du a, Sa. Jain, N. Majumda , A. Modak, K. Mondal, S. Mukhe jee, S. Mukhopadhyay, A. Roy, D. Roy, S. Roy Chowdhu y, S. Sa ka , M. Sha an Bhabha A omic Resea ch Cen e, Mumbai, India A. Abdulsalam, R. Chudasama, D. Du a, V. Jha, V. Kuma , A. K. Mohan y2, L. M. Pan , P. Shukla, A. Topka Ta a Ins i u e o Fundamen al Resea ch, Mumbai, India T. Aziz, S. Bane jee, S. Bhowmik26, R. M. Cha e jee, R. K. Dewanjee, S. Dugad, S. Ganguly, S. Ghosh, M. Guchai , A. Gu u27, G. Kole, S. Kuma , B. Mahakud, M. Mai y26, G. Majumde , K. Mazumda , S. Mi a, G. B. Mohan y, B. Pa ida, T. Sa ka 26, N. Su , B. Su a , N. Wick amage28 Indian Ins i u e o Science Educa ion and Resea ch (IISER), Pune, India S. Chauhan, S. Dube, K. Ko heka , S. Sha ma Ins i u e o Resea ch in Fundamen al Sciences (IPM), Teh an, I an H. Bakhshiansohi, H. Behnamian, S. M. E esami29, A. Fahim30, R. Goldouzian, M. Khakzad, M. Mohammadi Naja abadi, M. Nase i, S. Pak ina Mehdiabadi, F. Rezaei Hosseinabadi, B. Sa a zadeh31, M. Zeinali Uni e si y College Dublin, Dublin, I eland M. Felcini, M. G unewald INFN Sezione di Ba ia, Uni e si à di Ba ib, Poli ecnico di Ba ic, Ba i, I aly M. Abb esciaa,b, C. Calab iaa,b, C. Capu oa,b, A. Colaleoa, D. C eanzaa,c,L.C is ella a,b, N. De Filippisa,c, M. De Palmaa,b,L.Fio e a, G. Iasellia,c, G. Maggia,c, M. Maggia, G. Minielloa,b,S.My a,c, S. Nuzzoa,b, A. Pompilia,b, G. Pugliesea,c, R. Radognaa,b, A. Ranie ia, G. Sel aggia,b, L. Sil es isa,2, R. Vendi ia,b, P. Ve willigena INFN Sezione di Bolognaa, Uni e si à di Bolognab, Bologna, I aly G. Abbiendia, C. Ba ilana2, A. C. Ben enu ia, D. Bonaco sia,b, S. B aiban -Giacomellia,b, L. B igliado ia,b, R. Campaninia,b, P. Capiluppia,b,A.Cas o a,b, F. R. Ca alloa,S.S.Chhib a a,b, G. Codispo ia,b, M. Cu iania,b, G. M. Dalla allea, F. Fabb ia, A. Fan ania,b, D. Fasanellaa,b, P. Giacomellia, C. G andia, L. Guiduccia,b, S. Ma cellinia, G. Mase ia, A. Mon ana ia,F.L.Na a ia a,b, A. Pe o aa,A.M.Rossi a,b, T. Ro ellia,b,G.P.Si oli a,b,N.Tosi a,b, R. T a aglinia,b 123 Eu . Phys. J. C (2017) 77 :15 Page 19 o 27 15 INFN Sezione di Ca aniaa, Uni e si à di Ca aniab, Ca ania, I aly G. Cappelloa, M. Chio bolia,b,S.Cos a a,b, A. Di Ma iaa, F. Gio danoa,b, R. Po enzaa,b, A. T icomia,b,C.Tu e a,b INFN Sezione di Fi enzea, Uni e si à di Fi enzeb, Flo ence, I aly G. Ba baglia, V. Ciullia,b, C. Ci ininia, R. D’Alessand oa,b, E. Foca dia,b, S. Gonzia,b,V.Go i a,b, P. Lenzia,b, M. Meschinia, S. Paole ia, G. Sguazzonia, A. T opianoa,b, L. Viliania,b,2 INFN Labo a o i Nazionali di F asca i, F asca i, I aly L. Benussi, S. Bianco, F. Fabb i, D. Piccolo, F. P ima e a INFN Sezione di Geno aa, Uni e si à di Geno ab, Genoa, I aly V. Cal ellia,b,F.Fe o a, M. Lo Ve e ea,b, M. R. Mongea,b, E. Robu ia,S.Tosi a,b INFN Sezione di Milano-Bicoccaa, Uni e si à di Milano-Bicoccab, Milan, I aly L. B ianza, M. E. Dina doa, S. Fio endia,b, S. Gennaia, R. Ge osaa,b, A. Ghezzia,b,P.Go oni a,b, S. Mal ezzia, R. A. Manzonia,b, B. Ma zocchia,b,2, D. Menascea, L. Mo onia, M. Paganonia,b, D. Ped inia, S. Ragazzia,b, N. Redaellia, T. Taba elli de Fa isa,b INFN Sezione di Napolia, Uni e si à di Napoli Fede ico II’b, Naples, I aly, Uni e si à della Basilica ac, Po enza, I aly, Uni e si à G. Ma conid, Rome, I aly S. Buon empoa, N. Ca alloa,c,S.DiGuida a,d,2, M. Esposi oa,b, F. Fabozzia,c,A.O.M.Io io a,b, G. Lanzaa, L. Lis aa, S. Meolaa,d,2, M. Me olaa, P. Paoluccia,2, C. Sciaccaa,b, F. Thyssen INFN Sezione di Pado aa, Uni e si à di Pado ab, Pado a, I aly, Uni e si à di T en oc, T en o, I aly P. Azzia,b, N. Bacche aa, L. Bena oa,b, D. Biselloa,b, A. Bole ia,b, A. B ancaa,b, R. Ca lina,b, P. Checchiaa, M. Dall’Ossoa,b,2,T.Do igo a, U. Dossellia, F. Gaspa inia,b, U. Gaspa inia,b, A. Gozzelinoa, K. Kanishche a,c, S. Lacap a aa, M. Ma gonia,b, A. T. Meneguzzoa,b, J. Pazzinia,b, N. Pozzobona,b, P. Ronchesea,b, F. Simone oa,b, E. To assaa,M.Tosi a,b, S. Ven u aa,M.Zane i,P.Zo o a,b, A. Zucche aa,b,2, G. Zume lea,b INFN Sezione di Pa iaa, Uni e si à di Pa iab, Pa ia, I aly A. B aghie ia, A. Magnania, P. Mon agnaa,b,S.P.Ra i a,b,V.Re a, C. Ricca dia,b, P. Sal inia,I.Vai a, P. Vi uloa,b INFN Sezione di Pe ugiaa, Uni e si à di Pe ugiab, Pe ugia, I aly L. Alunni Soles izia,b,M.Biasini a,b,G.M.Bilei a, D. Ciango inia,b,2, L. Fanòa,b, P. La icciaa,b, G. Man o ania,b, M. Menichellia, A. Sahaa, A. San occhiaa,b INFN Sezione di Pisaa, Uni e si à di Pisab, Scuola No male Supe io e di Pisa c, Pisa, I aly K. And oso a,32, P. Azzu ia, G. Bagliesia, J. Be na dinia, T. Boccalia, R. Cas aldia, M. A. Cioccia,32,R.Dell’O so a, S. Dona oa,c,2, G. Fedi, L. Foàa,c,†, A. Giassia,M.T.G ippo a,32,F.Ligabue a,c, T. Lom adzea, L. Ma inia,b, A. Messineoa,b,F.Palla a, A. Rizzia,b, A. Sa oy-Na a oa,33, A. T. Se bana, P. Spagnoloa, R. Tenchinia,G.Tonelli a,b, A. Ven u ia, P. G. Ve dinia INFN Sezione di Romaa, Uni e si à di Romab, Rome, I aly L. Ba onea,b,F.Ca alla i a, G. D’impe ioa,b,2,D.DelRe a,b,M.Diemoz a, S. Gellia,b,C.Jo da a, E. Longoa,b, F. Ma ga olia,b, P. Me idiania, G. O gan inia,b, R. Pa ama ia, F. P eia oa,b,S.Raha lou a,b,C.Ro elli a, F. San anas asioa,b, P. T aczyka,b,2 INFN Sezione di To inoa, Uni e si à di To inob, Tu in, I aly, Uni e si à del Piemon e O ien ale c, No a a, I aly N. Amapanea,b, R. A cidiaconoa,c,2,S.A gi o a,b, M. A neodoa,c, R. Bellana,b, C. Biinoa, N. Ca igliaa,M.Cos a a,b, R. Co a ellia,b, A. Deganoa,b, N. Dema iaa,L.Finco a,b,2, B. Kiania,b, C. Ma io ia, S. Masellia, E. Miglio ea,b, V. Monacoa,b, E. Mon eila,b,M.M.Obe ino a,b, L. Pache a,b, N. Pas onea, M. Pelliccionia, G. L. Pinna Angionia,b, F. Ra e aa,b, A. Rome oa,b, M. Ruspaa,c, R. Sacchia,b, A. Solanoa,b,A.S aiano a, U. Tamponia INFN Sezione di T ies ea, Uni e si à di T ies eb, T ies e, I aly S. Bel o ea, V. Candelisea,b,2, M. Casa saa,F.Cossu i a, G. Della Riccaa,b, B. Gobboa,C.LaLica a a,b, M. Ma onea,b, A. Schizzia,b, A. Zane ia Kangwon Na ional Uni e si y, Chunchon, Ko ea A. K opi ni skaya, S. K. Nam 123 15 Page 20 o 27 Eu . Phys. J. C (2017) 77 :15 Kyungpook Na ional Uni e si y, Daegu, Ko ea D. H. Kim, G. N. Kim, M. S. Kim, D. J. Kong, S. Lee, Y. D. Oh, A. Sakha o , D. C. Son Chonbuk Na ional Uni e si y, Jeonju, Ko ea J. A. B oche o Ci uen es, H. Kim, T. J. Kim Chonnam Na ional Uni e si y, Ins i u e o Uni e se and Elemen a y Pa icles, Kwangju, Ko ea S. Song Ko ea Uni e si y, Seoul, Ko ea S. Choi, Y. Go, D. Gyun, B. Hong, M. Jo, H. Kim, Y. Kim, B. Lee, K. Lee, K. S. Lee, S. Lee, S. K. Pa k, Y. Roh Seoul Na ional Uni e si y, Seoul, Ko ea H. D. Yoo Uni e si y o Seoul, Seoul, Ko ea M.Choi,H.Kim,J.H.Kim,J.S.H.Lee,I.C.Pa k,G.Ryu,M.S.Ryu Sungkyunkwan Uni e si y, Suwon, Ko ea Y.Choi,J.Goh,D.Kim,E.Kwon,J.Lee,I.Yu Vilnius Uni e si y, Vilnius, Li huania V. Dudenas, A. Juodagal is, J. Vai kus Na ional Cen e o Pa icle Physics, Uni e si i Malaya, Kuala Lumpu , Malaysia I. Ahmed, Z. A. Ib ahim, J. R. Koma agi i, M. A. B. Md Ali34, F. Mohamad Id is35, W. A. T. Wan Abdullah, M. N. Yusli Cen o de In es igacion y de Es udios A anzados del IPN, Mexico Ci y, Mexico E. Casimi o Lina es, H. Cas illa-Valdez, E. De La C uz-Bu elo, I. He edia-De La C uz36, A. He nandez-Almada, R. Lopez-Fe nandez, A. Sanchez-He nandez Uni e sidad Ibe oame icana, Mexico Ci y, Mexico S. Ca illo Mo eno, F. Vazquez Valencia Beneme i a Uni e sidad Au onoma de Puebla, Puebla, Mexico I. Ped aza, H. A. Salaza Iba guen Uni e sidad Au ónoma de San Luis Po osí, San Luis Po osí, Mexico A. Mo elos Pineda Uni e si y o Auckland, Auckland, New Zealand D. K o check Uni e si y o Can e bu y, Ch is chu ch, New Zealand P. H. Bu le Na ional Cen e o Physics, Quaid-I-Azam Uni e si y, Islamabad, Pakis an A. Ahmad, M. Ahmad, Q. Hassan, H. R. Hoo ani, W. A. Khan, T. Khu shid, M. Shoaib Na ional Cen e o Nuclea Resea ch, Swie k, Poland H. Bialkowska, M. Bluj, B. Boimska, T. F ueboes, M. Gó ski, M. Kazana, K. Naw ocki, K. Romanowska-Rybinska, M. Szlepe , P. Zalewski Facul y o Physics, Ins i u e o Expe imen al Physics Uni e si y o Wa saw, Wa saw, Poland G. B ona, K. Bunkowski, A. Byszuk37, K. Do oba, A. Kalinowski, M. Konecki, J. K olikowski, M. Misiu a, M. Olszewski, M. Walczak Labo a ó io de Ins umen ação e Física Expe imen al de Pa ículas, Lisboa, Po ugal P. Ba gassa, C. Bei ão Da C uz E. Sil a, A. 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