Search for supersymmetry in events with a lepton, a photon, and large missing transverse energy in pp collisions at root{s}=7 TeV

EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH (CERN) CERN-PH-EP/2011-058 2011/05/17 CMS-SUS-11-002 Sea ch o supe symme y in e en s wi h a lep on, a pho on, and la ge missing ans e se ene gy in pp collisions a √s=7 TeV The CMS Collabo a ion∗ Abs ac A sea ch is pe o med o an excess o e en s, o e he s anda d model expec a- ions, wi h a pho on, a lep on, and la ge missing ans e se ene gy in pp collisions a √s=7 TeV. Such e en s a e expec ed in many new physics models, in pa icula a supe symme ic heo y ha is b oken ia a gauge-media ed mechanism, when he ligh es cha ged and neu al gauginos a e mass degene a e. The da a sample used in his sea ch co esponds o an in eg a ed luminosi y o 35 pb−1collec ed wi h he CMS de ec o a he LHC. No e idence o such an excess abo e he s anda d model back- g ounds, domina ed by Wγp oduc ion, is ound. The esul s a e p esen ed as 95% con idence le el uppe limi s on he c oss sec ion o a benchma k gauge-media ed scena io, and a e hen con e ed in o exclusion limi s on he squa k, gluino, and wino masses. Submi ed o he ou nal o High Ene gy Physics ∗See Appendix A o he lis o collabo a ion membe s a Xi :1105.3152 1 [hep-ex] 16 May 2011 1 1 In oduc ion Supe symme y (SUSY) is one o he bes s udied scena ios o physics beyond he s anda d model (SM). I alle ia es he hie a chy p oblem and may p o ide a pa h o he g and uni ica- ion o o ces. O pa icula in e es is a scena io wi h gauge-media ed SUSY b eaking [1–9], which elegan ly add esses he SUSY la ou p oblem. In he gauge media ion scena io, SUSY b eaking occu s a ene gy scales much smalle han he Planck scale, esul ing in he g a i ino (˜ G) as he ligh es SUSY pa icle (LSP), which would escape de ec ion and esul in an imbal- ance o momen um in he plane ans e se o he beam di ec ion (Emiss T). In one scena io o gene al gauge-media ed (GGM) SUSY [10, 11], he nex - o-ligh es SUSY pa icles (NLSP) a e mos ly he supe pa ne s o he SU(2)Lgauge ields (winos). This scena io esul s in a small mass spli ing be ween he cha ged ( ˜ W±) and neu al ( ˜ W0) winos. The cha ged wino decays p omp ly in o a g a i ino and a W boson, and he neu al wino in o a g a i ino and a pho on o a Z boson [12]. I R-pa i y is conse ed, colou ed SUSY pa icles a e pai -p oduced, esul ing in he p esence o wo NLSPs and mul iple je s pe e en . An example p ocess is shown in Fig. 1. The e en opologies o in e es he e o e con ain, in addi ion o Emiss T, one o he ollow- ing signa u es: wo pho ons (γ); lep on(s) (`) and one pho on; lep on(s) and je s; one pho on and je s; o all je s. Final s a es wi h wo o mo e lep ons a e supp essed because o he W and Z lep onic b anching ac ions. In his pape , we pe o m he i s sea ch o SUSY in he `+γ+Emiss T+X inal s a e p oduced in pp collisions a √s=7 TeV a he La ge Had on Collide (LHC). The `deno es an elec on o a muon. P e ious sea ches o anomalous p oduc ion o such e en s we e pe o med a he Fe milab Te a on [13–15]. g g ˜g ˜g jj jj γ ¯ν l− ˜ G ˜ G ˜q ˜q ˜ W0 ˜ W−W− Figu e 1: Feynman diag am o an example o a p ocess wi h s ong p oduc ion o cha ged and neu al winos ( ˜ W±and ˜ W0) as co-NLSP wi h mul iple je s (j), esul ing in he signa u e `+γ+Emiss T+X. 2 The CMS De ec o The Compac Muon Solenoid (CMS) is a nea ly he me ic, mul ipu pose de ec o and is de- sc ibed in de ail elsewhe e [16]. Cha ged pa icle ajec o ies a e measu ed wi h silicon pixel and s ip acking de ec o s encompassed by a 3.8 T supe conduc ing solenoid, wi h ull az- imu hal co e age and |η|<2.5. The azimu hal angle φis de ined in he plane ans e se o he beam di ec ion. The pseudo apidi y ηis de ined as η=−ln[ an(θ/2)], whe e θis he pola angle wi h espec o he coun e clockwise p o on beam di ec ion, wi h he o igin a he cen e o he de ec o . Ene gy deposi s o pa icles a e measu ed wi h lead- ungs a e c ys al elec o- 24 Backg ound Es ima ion magne ic (ECAL) and b ass/scin illa o (|η|<3) o i on/qua z- ibe (3 <|η|<5) had onic (HCAL) calo ime e s. Muon candida es a e iden i ied in gas-ionisa ion de ec o s embedded in he s eel e u n yoke o he magne . 3 Candida e E en Selec ion We use he da a sample collec ed by he CMS de ec o a he LHC om Ma ch o No embe 2010 co esponding o an in eg a ed luminosi y o 35 pb−1[17]. E en s a e equi ed o ha e a leas one high ans e se momen um (pT) elec on o muon, in addi ion o a pho on. E en s a e selec ed and eco ded using a wo- ie ed igge sys em. We use a sui e o single-elec on and single-muon igge s wi h se e al h esholds changing o ma ch he apidly inc easing in- s an aneous luminosi y o he LHC. The elec on candida es a e econs uc ed om clus e s o ene gy in he ECAL ba el (|η|<1.479) and endcaps (1.479 <|η|<3) and a e equi ed o ma ch cha ged acks econs uc ed in he silicon acking de ec o s. Muons a e econs uc ed as cha ged acks ma ched o hi pa e ns in he muon de ec o s. We u he equi e he lead- ing elec on o muon o ha e pT>20 GeV, |η|<2.1 and o sa is y a se o iden i ica ion and isola ion c i e ia [18]. Fo elec ons, he egion om 1.44 <|η|<1.57 is excluded since i con ains se ices and cables exi ing be ween he ansi ion o he ba el and endcap calo ime- e s and leads o lowe quali y econs uc ed clus e s. E en s in which he elec on is con- sis en wi h ha ing o igina ed om a pho on con e sion a e ejec ed. The e iciency o he igge s o e en s wi h an elec on (muon) wi h pTabo e 20 GeV is measu ed o be 0.98 ±0.01 (0.968 ±0.004). Lep on iden i ica ion and econs uc ion e iciencies a e measu ed in da a using Z→`+`−decays. The a io o he lep on e iciencies measu ed in da a o hose om Mon e Ca lo (MC) simula ion (desc ibed below) is ound o be 0.928 ±0.015 (0.990 ±0.001) o an elec on (muon). We equi e he p esence o a leas one pho on wi h pT>30 GeV, |η|<1.44, spa ially sepa a ed om he lep on by ∆R(`,γ) = p(∆η)2+ (∆φ)2>0.4. The econs uc ion o pho on candida es in he calo ime e is simila o ha o he elec ons, wi h he addi ional equi emen ha hey do no ha e associa ed hi pa e ns in he pixel de ec o consis en wi h a ack. The da a/MC scale ac o o he pho on e iciency is 0.97 ±0.02. We demand ha he lep on and he pho on candida es be isola ed om any o he ac i i y in he acke , ECAL, o HCAL. The e en s a e equi ed o con ain a leas one econs uc ed p ima y e ex wi hin 24 cm o he geome ic cen e o he de ec o along he beamline and a ans e se dis ance wi h espec o he econs uc ed beam axis o less han 2 cm. These selec ions de ine ou candida e sample, which consis s o 264 (126) e en s in he eγ(µγ) channel. Finally, in o de o minimise he numbe o expec ed backg ound e en s while e aining high signal e iciency, we selec e en s wi h Emiss T>100 GeV. The Emiss Tis econs uc ed using calo ime e ene gy deposi s and is co ec ed o he con ibu ion om he muons and o he expec ed calo ime e esponse o each econs uc ed had on ack [19]. 4 Backg ound Es ima ion The dominan backg ound p ocess is Wγp oduc ion, wi h he W boson decaying lep onically. This backg ound is es ima ed using he MADGRAPH MC gene a o [20] wi h pa on showe ing using PYTHIA [21]. The esul is scaled om he leading-o de (LO) o he nex - o-leading-o de (NLO) c oss sec ion ob ained om he BAUR NLO Wγgene a o [22] and using he CTEQ66 NLO pa on dis ibu ion unc ion (PDF) se s [23]. Fo example, o a pho on wi h pT=50 GeV he NLO/LO K ac o is 2.3. The NLO calcula ion is in good ag eemen wi h he Wγp oduc- ion c oss sec ion measu ed by he CMS collabo a ion [24], o e he ele an phase space o ha measu emen , gi ing con idence in he NLO p edic ion used he e. The MC e en s a e 3 p ocessed wi h he ull CMS de ec o simula ion based on he Gean 4 [25] package. To es i- ma e he unce ain y on he K ac o due o highe -o de co ec ions, we a y he ac o isa ion and eno malisa ion scales by a ac o o wo and obse e a a ia ion in he c oss sec ion o app oxima ely 20%. Addi ional sys ema ic unce ain ies on his backg ound es ima e include he unce ain ies on he igge e iciencies and da a/MC scale ac o s desc ibed abo e, he PDF se es ima ed using he PDF4LHC wo king g oup p ocedu e (2%) [26], and he in eg a ed luminosi y measu emen (4%) [17]. The nex mos impo an ins umen al backg ound o igina es om SM p ocesses ha ha e misiden i ied lep ons and pho ons. Da a-d i en me hods a e used o de e mine all backg ounds in ol ing objec misiden i ica ion [27]. We conside sou ces o backg ound in which a je o an elec on is misiden i ied as a pho on (je →γand e →γ) o in which a je is misiden i ied as a lep on. The dominan SM p ocesses ha con ibu e o he je →γmisiden i ica ion back- g ound include W+je s and QCD mul ije p oduc ion. The je →γbackg ound is de e mined by selec ing a sample o e en s ha sa is y he c i e ia o ou `γcandida e sample excep ha he pho on is equi ed o ail ei he he isola ion o elec omagne ic showe shape c i e ion. We hen weigh his sample by he p obabili y o misiden i ying a je as a pho on [28] o es ima e he o al con ibu ion o his backg ound o he signal sample. The SM p ocesses con ibu ing o he e →γmisiden i ica ion backg ound a e p edominan ly Z and ¯ p oduc ion. The e →γ backg ound is de e mined in a simila way o he je →γbackg ound, by selec ing a sample o e en s ha sa is y he c i e ia o ou `γcandida e sample bu wi h he addi ional equi e- men ha he pho on be ma ched o a pa e n o hi s in he pixel acke . We hen weigh his sample by he p obabili y o misiden i ying an elec on as a pho on ( γe) o es ima e he o al con ibu ion o his backg ound o he signal sample. The p obabili y, γe, is de e mined om Z→e+e−da a o be 0.014 ±0.004. The s a egy o de e mining QCD con ibu ions which ha e poo ly measu ed Emiss Tis o se- lec e en s wi h kinema ic p ope ies simila o he candida e e en s, bu which a e known o ha e no genuine Emiss T. A con ol sample o e en s domina ed by Z →e+e−decays is used. These e en s a e u he eweigh ed o ep oduce he `γsample kinema ics. In pa icula , we ep oduce he `γ ans e se ene gy dis ibu ion and, he e o e, he ans e se ene gy o he had onic ecoil agains he `γcandida es, ensu ing a co ec desc ip ion o he Emiss T. In o de o desc ibe he dis ibu ion o he ans e se mass o he lep on and Emiss Tsys em, de ined as MT=q2·pT`·Emiss T·(1−cos(φ`−φEmiss T)), he lep on pTdis ibu ion is also eweigh ed. We de e mine he backg ound con ibu ion by no malising he con ol sample in such a way ha he o al backg ound ma ches he numbe o selec ed e en s in da a wi h Emiss Tless han 30 GeV. Tables 1 and 2 summa ise he b eakdown o he backg ounds o Emiss T>40 GeV and o ou op imal selec ion o Emiss T>100 GeV. The dominan sou ces o sys ema ic unce ain ies a e due o he limi ed p ecision o he da a-d i en me hods and he unce ain ies on he co esponding misiden i ica ion a e measu emen s. 5 Resul s The Emiss Tdis ibu ion is shown in Fig. 2 ( op) o he eγand µγ channels combined, oge he wi h he sum o he expec ed backg ound con ibu ions, as well as he expec a ion o he signal om a SUSY benchma k poin ( e e ed o as GMC, desc ibed below) o compa ison. Figu e 2 (bo om) shows he MTdis ibu ion. The da a ag ee well wi h he SM expec a ions and do no exhibi any e idence o an excess o e en s wi h high Emiss T. We pe o med se e al c oss-checks o suppo ou modeling o he SM backg ounds. Fo exam- 45 Resul s Table 1: E en coun s o da a and expec ed backg ound in he eγchannel. The unce ain y on he o al backg ound includes he an i-co ela ion be ween he unce ain ies on he indi idual componen s due o he scaling o he QCD backg ound o he e en s wi h Emiss T<30 GeV as desc ibed in he ex . The expec ed e en yields om he SUSY benchma k poin GMC (Sec ion 5) a e also shown. No Emiss Tselec ion Emiss T>40 GeV Emiss T>100 GeV Wγ44.5 ±9.2 16.1 ±3.4 1.68 ±0.42 je →γ20.3 ±4.5 3.1 ±0.9 0.02 ±0.02 e→γ70.5 ±19.1 0.3 ±0.1 0.04 ±0.03 QCD 134 ±28 0.4 ±0.2 0.00 ±0.00 To al backg ound 269 ±18 19.9 ±3.7 1.74 ±0.43 da a 264 16 1 SUSY GMC p edic ion 3.94 ±0.79 3.76 ±0.75 2.79 ±0.56 Table 2: E en coun s o da a and expec ed backg ound in he µγ channel. The unce ain y on he o al backg ound includes he an i-co ela ion be ween he unce ain ies on he indi idual componen s due o he scaling o he QCD backg ound o he e en s wi h Emiss T<30 GeV as desc ibed in he ex . The expec ed e en yields om he SUSY benchma k poin GMC (Sec ion 5) a e also shown. No Emiss Tselec ion Emiss T>40 GeV Emiss T>100 GeV Wγ44.8 ±9.3 15.9 ±3.4 1.40 ±0.37 je →γ18.0 ±4.0 3.7 ±1.1 0.10 ±0.09 e→γ1.2 ±0.4 0.6 ±0.2 0.09 ±0.04 QCD 58.3 ±15.1 0.2 ±0.1 0.00 ±0.00 To al backg ound 122.3 ±12.3 20.4 ±3.7 1.59 ±0.39 da a 126 27 1 SUSY GMC p edic ion 5.12 ±1.02 4.84 ±0.96 3.66 ±0.73 5 ple, e en s wi h MTabo e 70 GeV ha e small QCD backg ound, as shown in Fig. 2 (bo om), and we e i ied ha we can desc ibe all he kinema ic dis ibu ions in hese e en s wi h he sum o he expec ed backg ounds, excep he con ibu ion om QCD. We also checked ha he pho on candida es ha e a iming consis en wi h ha ing o igina ed om he p ima y e ex, o e i y ha non-collision backg ounds a e negligible. Finally, we e i ied ha ou QCD back- g ound de e mina ion p ocedu e wo ks in he p esence o a la ge ange o SUSY signals by mixing simula ed SUSY e en s in o he da a sample and ecalcula ing he QCD backg ound; he change in i s alue was ound o be negligible. Since we obse e no e idence o an excess o e en s wi h high Emiss Tcompa ed o he SM ex- pec a ions, we in e p e ou esul s by placing 95% con idence le el (CL) lowe limi s on GGM SUSY pa icle masses in a benchma k model. The GGM SUSY [12] signal is simula ed using he PYTHIA [21] MC gene a o e sion 6.420 wi h une D6T [29], and assuming ha he squa k mass (m(˜ q)) is app oxima ely equal o he gluino mass (m(˜ g)), wi h he cha ged and neu al winos as co-NLSPs, and an β=2. This sea ch ocuses on he m(˜ W0)>100 GeV egion, which is beyond he sensi i i y o he p e ious collide expe imen s [13–15, 30]. We he e o e gene a e poin s wi h m(˜ g)and m(˜ q)in he ange o 350–800 GeV and m(˜ W0)≈m(˜ W±)in he ange o 100–480 GeV. The gene a ed e en s a e p ocessed wi h he ull CMS de ec o simula ion using he Gean 4 package. The NLO K ac o s we e calcula ed using PROSPINO [31] and a e ound on a e age o be 1.4 wi h a ∼20% a ia ion. As an example o a SUSY benchma k model, we use he poin gene a ed wi h m(˜ g) = m(˜ q) = 450 GeV and m(˜ W0)≈m(˜ W±) = 195 GeV, e e ed o as GMC. We use a Bayesian app oach o de e mine he 95% CL uppe limi s on he c oss sec ions in he benchma k SUSY model desc ibed abo e, combining he likelihoods o he eγand µγ channels. The inpu s o bo h channels a e he sum o he da a-d i en backg ounds, he Wγbackg ound as de e mined om he MC simula ion and co ec ed by he app op ia e da a/MC scale ac- o s, and, o each MC SUSY poin , he e iciency imes accep ance, co ec ed o he app op i- a e da a/MC scale ac o s. Each o hese inpu s o a gi en channel has log-no mal dis ibu ed nuisance pa ame e s ha a y by he unce ain y in each quan i y. We conside he 4% unce - ain y on he luminosi y as an addi ional nuisance pa ame e . As an example o he calcula ion, he e iciency imes accep ance imes b anching a io o he GMC benchma k poin o eγ(µγ) is 0.0063 ±0.0003 (0.0083 ±0.0004). The 95% CL uppe limi on he c oss sec ion ob ained o his poin is 8.7 pb. The limi is less han he p edic ed NLO c oss sec ion o his poin , (12.7 ± 2.6) pb, wi h unce ain ies due o he PDF [26] (10%) and he eno maliza ion scale (18%). We he e o e exclude his poin wi h mo e han 95% con idence. The obse ed 95% CL uppe limi s on he c oss sec ion a e shown in Fig. 3 as a unc ion o he squa k / gluino and he wino masses o he kinema ic selec ions applied in his analysis (an elec on wi h pT>20 GeV, |η|<1.44 o 1.57 <|η|<2.1; a muon wi h pT>20 GeV and |η|<2.1; a pho on wi h pT>30 GeV, |η|<1.44; e en s wi h Emiss T>100 GeV). Figu e 4 displays he esul ing 95% CL exclusion e- gion in he squa k / gluino and wino mass plane, whe e masses in he a ea below he cu e a e excluded. The shaded egion a ound he cen al alue o he exclusion con ou ep esen s he a ia ion o he p edic ed c oss sec ion by one s anda d de ia ion. Also shown is he expec ed 95% CL exclusion as well as he he egion excluded by p e ious sea ches a he Te a on in he same channel [13–15], as in e p e ed in [30]. 6 Conclusions We pe o med he i s sea ch in p o on-p o on collisions a √s=7 TeV o an excess o e en s wi h a pho on, a lep on, and la ge Emiss To e he SM expec a ion. Using a da a sample co e- 66 Conclusions (GeV) miss T E 0 20 40 60 80 100 120 140 160 180 200 E en s / 5 GeV -1 10 1 10 2 10 =7 TeVs, -1 CMS, 35 pb da a expec a ion o GMC o al bkg unce ain y MCγW γ l → je lγ l → e l QCD (GeV) miss T E 0 20 40 60 80 100 120 140 160 180 200 E en s / 5 GeV -1 10 1 10 2 10 (GeV) T M 0 20 40 60 80 100 120 140 160 180 200 E en s / 5 GeV -1 10 1 10 2 10 =7 TeVs, -1 CMS, 35 pb da a expec a ion o GMC o al bkg unce ain y MCγW γ l → je lγ l → e l QCD (GeV) T M 0 20 40 60 80 100 120 140 160 180 200 E en s / 5 GeV -1 10 1 10 2 10 Figu e 2: The Emiss T( op) and MTdis ibu ions (bo om) o he combined eγand µγ samples, wi h loga i hmic scales on he e ical axes; he las bin shown in bo h dis ibu ions includes he o e low e en s. The black poin s ep esen he 35 pb−1da a sample, and he colou ed his og ams show he indi idual backg ound componen s. The o al backg ound and i s unce - ain y a e ep esen ed by he shaded band. The expec a ion om he SUSY benchma k poin GMC is shown by he ed dashed line. 7 wino mass (GeV) 150 200 250 300 350 400 450 500 550 squa k / gluino mass (GeV) 400 450 500 550 600 650 700 750 800 95% CL limi (pb) 0 5 10 15 20 25 30 35 40 wino mass (GeV) 150 200 250 300 350 400 450 500 550 squa k / gluino mass (GeV) 400 450 500 550 600 650 700 750 800 -1 CMS, 35 pb =7 TeVs GMC Figu e 3: The obse ed 95% CL uppe limi s on he c oss sec ion as a unc ion o he squa k / gluino mass (since m(˜ q)≈m(˜ g)) and he wino mass is shown o he ange o MC poin s gene a ed o his analysis. The s a indica es he SUSY benchma k poin GMC. 14 A The CMS Collabo a ion Uni e si y o So ia, So ia, Bulga ia A. Dimi o , R. Hadjiiska, A. Ka adzhino a, V. Kozhuha o , L. Li o , M. Ma ee , B. Pa lo , P. Pe ko Ins i u e o High Ene gy Physics, Beijing, China J.G. Bian, G.M. Chen, H.S. Chen, C.H. Jiang, D. Liang, S. Liang, X. Meng, J. Tao, J. Wang, J. Wang, X. Wang, Z. Wang, H. Xiao, M. Xu, J. Zang, Z. Zhang S a e Key Lab. o Nucl. Phys. and Tech., Peking Uni e si y, Beijing, China Y. Ban, S. Guo, Y. Guo, W. Li, Y. Mao, S.J. Qian, H. Teng, B. Zhu, W. Zou Uni e sidad de Los Andes, Bogo a, Colombia A. Cab e a, B. Gomez Mo eno, A.A. Ocampo Rios, A.F. Oso io Oli e os, J.C. Sanab ia Technical Uni e si y o Spli , Spli , C oa ia N. Godino ic, D. Lelas, K. Lelas, R. Ples ina3, D. Polic, I. Puljak Uni e si y o Spli , Spli , C oa ia Z. An uno ic, M. Dzelalija Ins i u e Rudje Bosko ic, Zag eb, C oa ia V. B iglje ic, S. Du ic, K. Kadija, S. Mo o ic Uni e si y o Cyp us, Nicosia, Cyp us A. A ikis, M. Galan i, J. Mousa, C. Nicolaou, F. P ochos, P.A. Razis Cha les Uni e si y, P ague, Czech Republic M. Finge , M. Finge J . 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 Y. Ass an4, S. Khalil5, M.A. Mahmoud6 Na ional Ins i u e o Chemical Physics and Biophysics, Tallinn, Es onia A. Hek o , M. Kadas ik, M. M¨ un el, M. Raidal, L. Rebane Depa men o Physics, Uni e si y o Helsinki, Helsinki, Finland V. Azzolini, P. Ee ola, G. Fedi Helsinki Ins i u e o Physics, Helsinki, Finland S. Czella , J. H¨ a k¨ onen, A. Heikkinen, V. Ka im¨ aki, R. Kinnunen, M.J. Ko elainen, T. Lamp´ en, K. Lassila-Pe ini, S. Leh i, T. Lind´ en, P. Luukka, T. M¨ aenp¨ a¨ a, E. Tuominen, J. Tuominiemi, E. Tuo inen, D. Unga o, L. Wendland Lappeen an a Uni e si y o Technology, Lappeen an a, Finland K. Banzuzi, A. Ko pela, T. Tuu a Labo a oi e d’Annecy-le-Vieux de Physique des Pa icules, IN2P3-CNRS, Annecy-le-Vieux, F ance D. Sillou DSM/IRFU, CEA/Saclay, Gi -su -Y e e, F ance M. Besancon, S. Choudhu y, M. Deja din, D. Deneg i, B. Fabb o, J.L. Fau e, F. Fe i, S. Ganjou , F.X. Gen i , A. Gi e naud, P. G as, G. Hamel de Monchenaul , P. Ja y, E. Locci, J. Malcles, M. Ma ionneau, L. Millische , J. Rande , A. Rosowsky, I. Sh eybe , M. Ti o , P. Ve ecchia 15 Labo a oi e Lep ince-Ringue , Ecole Poly echnique, IN2P3-CNRS, Palaiseau, F ance S. Ba ioni, F. Beaude e, L. Benhabib, L. Bianchini, M. Bluj7, C. B ou in, P. Busson, C. Cha lo , T. Dahms, L. Dob zynski, S. Elgammal, R. G anie de Cassagnac, M. Haguenaue , P. Min´ e, C. Mi ono , C. Ochando, P. Paganini, D. Sabes, R. Sale no, Y. Si ois, C. Thiebaux, B. Wyslouch8, A. Zabi Ins i u Plu idisciplinai e Hube Cu ien, Uni e si ´e de S asbou g, Uni e si ´e de Hau e Alsace Mulhouse, CNRS/IN2P3, S asbou g, F ance J.-L. Ag am9, J. And ea, D. Bloch, D. Bodin, J.-M. B om, M. Ca daci, E.C. Chabe , C. Colla d, E. Con e9, F. D ouhin9, C. Fe o, J.-C. Fon aine9, D. Gel´ e, U. Goe lach, S. G ede , P. Juillo , M. Ka im9, A.-C. Le Bihan, Y. Mikami, P. Van Ho e Cen e de Calcul de l’Ins i u Na ional de Physique Nucleai e e de Physique des Pa icules (IN2P3), Villeu banne, F ance F. Fassi, D. Me cie Uni e si ´e de Lyon, Uni e si ´e Claude Be na d Lyon 1, CNRS-IN2P3, Ins i u de Physique Nucl´eai e de Lyon, Villeu banne, F ance C. Ba y, S. Beauce on, N. Beaupe e, M. Bedjidian, O. Bondu, G. Boudoul, D. Boumediene, H. B un, J. Chasse a , R. Chie ici, D. Con a do, P. Depasse, H. El Mamouni, J. Fay, S. Gascon, B. Ille, T. Ku ca, T. Le G and, M. Le huillie , L. Mi abi o, S. Pe ies, V. So dini, S. Tosi, Y. Tschudi, P. Ve die Ins i u e o High Ene gy Physics and In o ma iza ion, Tbilisi S a e Uni e si y, Tbilisi, Geo gia D. Lomidze RWTH Aachen Uni e si y, I. Physikalisches Ins i u , Aachen, Ge many G. Anagnos ou, M. Edelho , L. Feld, N. He acleous, O. Hind ichs, R. Jussen, K. Klein, J. Me z, N. Moh , A. Os apchuk, A. Pe ieanu, F. Raupach, J. Samme , S. Schael, D. Sp enge , H. Webe , M. Webe , B. Wi me RWTH Aachen Uni e si y, III. Physikalisches Ins i u A, Aachen, Ge many M. A a, W. Bende , E. Die z-Lau sonn, M. E dmann, J. F angenheim, T. Hebbeke , A. Hinzmann, K. Hoep ne , T. Klimko ich, D. Klingebiel, P. K euze , D. Lanske†, C. Magass, M. Me schmeye , A. Meye , P. Papacz, H. Pie a, H. Rei hle , S.A. Schmi z, L. Sonnenschein, J. S eggemann, D. Teyssie RWTH Aachen Uni e si y, III. Physikalisches Ins i u B, Aachen, Ge many M. Bon enackels, M. Da ids, M. Duda, G. Fl¨ ugge, H. Geenen, M. Gi els, W. Haj Ahmad, D. Heydhausen, T. K ess, Y. Kuessel, A. Linn, A. Nowack, L. Pe challa, O. Poo h, J. Renne eld, P. Saue land, A. S ahl, M. Thomas, D. To nie , M.H. Zoelle Deu sches Elek onen-Synch o on, Hambu g, Ge many M. Aldaya Ma in, W. Beh enho , U. Beh ens, M. Be gholz10, A. Be hani, K. Bo as, A. Caki , A. Campbell, E. Cas o, D. Dammann, G. Ecke lin, D. Ecks ein, A. Flossdo , G. Flucke, A. Geise , J. Hauk, H. Jung1, M. Kasemann, I. Ka ko 11, P. Ka sas, C. Kleinwo , H. Kluge, A. Knu sson, M. K ¨ ame , D. K ¨ ucke , E. Kuzne so a, W. Lange, W. Lohmann10, R. Mankel, M. Ma ien eld, I.-A. Melze -Pellmann, A.B. Meye , J. Mnich, A. Mussgille , J. Olzem, A. Pe ukhin, D. Pi zl, A. Raspe eza, A. Ra al, M. Rosin, R. Schmid 10, T. Schoe ne -Sadenius, N. Sen, A. Spi idono , M. S ein, J. Tomaszewska, R. Walsh, C. Wissing Uni e si y o Hambu g, Hambu g, Ge many C. Au e mann, V. Blobel, S. Bob o skyi, J. D aege , H. Ende le, U. Gebbe , K. Kaschube, 16 A The CMS Collabo a ion G. Kaussen, R. Klanne , J. Lange, B. Mu a, S. Naumann-Emme, F. Nowak, N. Pie sch, C. Sande , H. Sche le , P. Schlepe , M. Sch ¨ ode , T. Schum, J. Schwand , H. S adie, G. S einb ¨ uck, J. Thomsen Ins i u ¨u Expe imen elle Ke nphysik, Ka ls uhe, Ge many C. Ba h, J. Baue , J. Be ge , V. Buege, T. Chwalek, W. De Boe , A. Die lamm, G. Di kes, M. Feind , J. G uschke, C. Hacks ein, F. Ha mann, M. Hein ich, H. Held, K.H. Ho mann, S. Honc, J.R. Koma agi i, T. Kuh , D. Ma schei, S. Muelle , Th. M¨ ulle , M. Niegel, O. Obe s , A. Oehle , J. O , T. Pei e , G. Quas , K. Rabbe z, F. Ra niko , N. Ra niko a, M. Renz, C. Saou , A. Scheu e , P. Schie e decke , F.-P. Schilling, G. Scho , H.J. Simonis, F.M. S obe , D. T oendle, J. Wagne -Kuh , T. Weile , M. Zeise, V. Zhuko 11, E.B. Zieba h Ins i u e o Nuclea Physics ”Demok i os”, Aghia Pa aske i, G eece G. Daskalakis, T. Ge alis, S. Kesisoglou, A. Ky iakis, D. Loukas, I. Manolakos, A. Ma kou, C. Ma kou, C. Ma omma is, E. N oma i, E. Pe akou Uni e si y o A hens, A hens, G eece L. Gouskos, T.J. Me zimekis, A. Panagio ou, E. S ilia is Uni e si y o Io´annina, Io´annina, G eece I. E angelou, C. Foudas, P. Kokkas, N. Man hos, I. Papadopoulos, V. Pa as, F.A. T ian is KFKI Resea ch Ins i u e o Pa icle and Nuclea Physics, Budapes , Hunga y A. A anyi, G. Bencze, L. Boldizsa , C. Hajdu1, P. Hidas, D. Ho a h12, A. Kapusi, K. K ajcza 13, F. Sikle 1, G.I. Ve es13, G. Vesz e gombi13 Ins i u e o Nuclea Resea ch ATOMKI, Deb ecen, Hunga y N. Beni, J. Molna , J. Palinkas, Z. Szillasi, V. Veszp emi Uni e si y o Deb ecen, Deb ecen, Hunga y P. Raics, Z.L. T ocsanyi, B. Uj a i Panjab Uni e si y, Chandiga h, India S.B. Be i, V. Bha naga , N. Dhing a, R. Gup a, M. Jindal, M. Kau , J.M. Kohli, M.Z. Meh a, N. Nishu, L.K. Saini, A. Sha ma, A.P. Singh, J.B. Singh, S.P. Singh Uni e si y o Delhi, Delhi, India S. Ahuja, S. Bha acha ya, B.C. Choudha y, B. Gombe , P. Gup a, S. Jain, S. Jain, R. Khu ana, A. Kuma , M. Naimuddin, K. Ranjan, R.K. Shi pu i Saha Ins i u e o Nuclea Physics, Kolka a, India S. Sa ka Bhabha A omic Resea ch Cen e, Mumbai, India R.K. Choudhu y, D. Du a, S. Kailas, V. Kuma , P. Meh a, A.K. Mohan y1, L.M. Pan , P. Shukla Ta a Ins i u e o Fundamen al Resea ch - EHEP, Mumbai, India T. Aziz, M. Guchai 14, A. Gu u, M. Mai y15, D. Majumde , G. Majumde , K. Mazumda , G.B. Mohan y, A. Saha, K. Sudhaka , N. Wick amage Ta a Ins i u e o Fundamen al Resea ch - HECR, Mumbai, India S. Bane jee, S. Dugad, N.K. Mondal Ins i u e o Resea ch and Fundamen al Sciences (IPM), Teh an, I an H. A aei, H. Bakhshiansohi16, S.M. E esami, A. Fahim16, M. Hashemi, A. Ja a i16, M. Khakzad, 17 A. Mohammadi17, M. Mohammadi Naja abadi, S. Pak ina Mehdiabadi, B. Sa a zadeh, M. Zeinali18 INFN Sezione di Ba i a, Uni e si `a di Ba i b, Poli ecnico di Ba i c, Ba i, I aly M. Abb esciaa,b, L. Ba bonea,b, C. Calab iaa,b, A. Colaleoa, D. C eanzaa,c, N. De Filippisa,c,1, M. De Palmaa,b, L. Fio ea, G. Iasellia,c, L. Lusi oa,b, G. Maggia,c, M. Maggia, N. Mannaa,b, B. Ma angellia,b, S. Mya,c, S. Nuzzoa,b, N. Paci icoa,b, G.A. Pie oa, A. Pompilia,b, G. Pugliesea,c, F. Romanoa,c, G. Rosellia,b, G. Sel aggia,b, L. Sil es isa, R. T en aduea, S. Tuppu ia,b, G. Zi oa INFN Sezione di Bologna a, Uni e si `a di Bologna b, Bologna, I aly G. Abbiendia, A.C. Ben enu ia, D. Bonaco sia, S. B aiban -Giacomellia,b, L. B igliado ia, P. Capiluppia,b, A. Cas oa,b, F.R. Ca alloa, M. Cu iania,b, G.M. Dalla allea, F. Fabb ia, A. Fan ania,b, D. Fasanellaa, P. Giacomellia, M. Giun aa, C. G andia, S. Ma cellinia, G. Mase ib, M. Meneghellia,b, A. Mon ana ia, F.L. Na a iaa,b, F. Odo icia, A. Pe o aa, F. P ima e aa, A.M. Rossia,b, T. Ro ellia,b, G. Si olia,b, R. T a aglinia,b INFN Sezione di Ca ania a, Uni e si `a di Ca ania b, Ca ania, I aly S. Albe goa,b, G. Cappelloa,b, M. Chio bolia,b,1, S. Cos aa,b, A. T icomia,b, C. Tu ea,b INFN Sezione di Fi enze a, Uni e si `a di Fi enze b, Fi enze, I aly G. Ba baglia, V. Ciullia,b, C. Ci ininia, R. D’Alessand oa,b, E. Foca dia,b, S. F osalia,b, E. Galloa, S. Gonzia,b, P. Lenzia,b, M. Meschinia, S. Paole ia, G. Sguazzonia, A. T opianoa,1 INFN Labo a o i Nazionali di F asca i, F asca i, I aly L. Benussi, S. Bianco, S. Cola anceschi19, F. Fabb i, D. Piccolo INFN Sezione di Geno a, Geno a, I aly P. Fabb ica o e, R. Musenich INFN Sezione di Milano-Biccoca a, Uni e si `a di Milano-Bicocca b, Milano, I aly A. Benagliaa,b, F. De Guioa,b,1, L. Di Ma eoa,b, S. Gennai1, A. Ghezzia,b, S. Mal ezzia, A. Ma ellia,b, A. Massi onia,b, D. Menascea, L. Mo onia, M. Paganonia,b, D. Ped inia, S. Ragazzia,b, N. Redaellia, S. Salaa, T. Taba elli de Fa isa,b INFN Sezione di Napoli a, Uni e si `a di Napoli ”Fede ico II” b, Napoli, I aly S. Buon empoa, C.A. Ca illo Mon oyaa,1, N. Ca alloa,20, A. De Cosaa,b, F. Fabozzia,20, A.O.M. Io ioa,1, L. Lis aa, M. Me olaa,b, P. Paoluccia INFN Sezione di Pado a a, Uni e si `a di Pado a b, Uni e si `a di T en o (T en o) c, Pado a, I aly P. Azzia, N. Bacche aa, P. Bellana,b, D. Biselloa,b, A. B ancaa, R. Ca lina,b, P. Checchiaa, M. De Ma iaa,b, T. Do igoa, U. Dossellia, F. Fanzagoa, F. Gaspa inia,b, U. Gaspa inia,b, A. Gozzelino, S. Lacap a aa,21, I. Lazzizze aa,c, M. Ma gonia,b, M. Mazzuca oa, A.T. Meneguzzoa,b, M. Nespoloa,1, L. Pe ozzia,1, N. Pozzobona,b, P. Ronchesea,b, F. Simone oa,b, E. To assaa, M. Tosia,b, S. Vaninia,b, P. Zo oa,b, G. Zume lea,b INFN Sezione di Pa ia a, Uni e si `a di Pa ia b, Pa ia, I aly P. Baessoa,b, U. Be zanoa, S.P. Ra ia,b, C. Ricca dia,b, P. To ea,b, P. Vi uloa,b, C. Vi iania,b INFN Sezione di Pe ugia a, Uni e si `a di Pe ugia b, Pe ugia, I aly M. Biasinia,b, G.M. Bileia, B. Capone ia,b, L. Fan` oa,b, P. La icciaa,b, A. Luca onia,b,1, G. Man o ania,b, M. Menichellia, A. Nappia,b, F. Romeoa,b, A. San occhiaa,b, S. Ta onia,b,1, M. Valda aa,b 18 A The CMS Collabo a ion INFN Sezione di Pisa a, Uni e si `a di Pisa b, Scuola No male Supe io e di Pisa c, Pisa, I aly P. Azzu ia,c, G. Bagliesia, J. Be na dinia,b, T. Boccalia,1, G. B occoloa,c, R. Cas aldia, R.T. D’Agnoloa,c, R. Dell’O soa, F. Fio ia,b, L. Fo` aa,c, A. Giassia, A. K aana, F. Ligabuea,c, T. Lom adzea, L. Ma inia,22, A. Messineoa,b, F. Pallaa, G. Segne ia, A.T. Se bana, P. Spagnoloa, R. Tenchinia, G. Tonellia,b,1, A. Ven u ia,1, P.G. Ve dinia INFN Sezione di Roma a, Uni e si `a di Roma ”La Sapienza” b, Roma, I aly L. Ba onea,b, F. Ca alla ia, D. Del Rea,b, E. Di Ma coa,b, M. Diemoza, D. F ancia,b, M. G assia,1, E. Longoa,b, S. Nou bakhsha, G. O gan inia,b, F. Pandol ia,b,1, R. Pa ama ia, S. Raha loua,b, C. Ro elli1 INFN Sezione di To ino a, Uni e si `a di To ino b, Uni e si `a del Piemon e O ien ale (No- a a) c, To ino, I aly N. Amapanea,b, R. A cidiaconoa,c, S. A gi oa,b, M. A neodoa,c, C. Biinoa, C. Bo aa,b,1, N. Ca igliaa, R. Cas elloa,b, M. Cos aa,b, N. Dema iaa, A. G azianoa,b,1, C. Ma io ia, M. Ma onea,b, S. Masellia, E. Miglio ea,b, G. Milaa,b, V. Monacoa,b, M. Musicha,b, M.M. Obe inoa,c, N. Pas onea, M. Pelliccionia,b, A. Rome oa,b, M. Ruspaa,c, R. Sacchia,b, V. Solaa,b, A. Solanoa,b, A. S aianoa, A. Vilela Pe ei aa INFN Sezione di T ies e a, Uni e si `a di T ies e b, T ies e, I aly S. Bel o ea, F. Cossu ia, G. Della Riccaa,b, B. Gobboa, D. Mon aninoa,b, A. Penzoa Kangwon Na ional Uni e si y, Chunchon, Ko ea S.G. Heo, S.K. Nam Kyungpook Na ional Uni e si y, Daegu, Ko ea S. Chang, J. Chung, D.H. Kim, G.N. Kim, J.E. Kim, D.J. Kong, H. Pa k, S.R. Ro, D. Son, D.C. Son, T. Son Chonnam Na ional Uni e si y, Ins i u e o Uni e se and Elemen a y Pa icles, Kwangju, Ko ea Ze o Kim, J.Y. Kim, S. Song Ko ea Uni e si y, Seoul, Ko ea S. Choi, B. Hong, M.S. Jeong, M. Jo, H. Kim, J.H. Kim, T.J. Kim, K.S. Lee, D.H. Moon, S.K. Pa k, H.B. Rhee, E. Seo, S. Shin, K.S. Sim Uni e si y o Seoul, Seoul, Ko ea M. Choi, S. Kang, H. Kim, C. Pa k, I.C. Pa k, S. Pa k, G. Ryu Sungkyunkwan Uni e si y, Suwon, Ko ea Y. Choi, Y.K. Choi, J. Goh, M.S. Kim, E. Kwon, J. Lee, S. Lee, H. Seo, I. Yu Vilnius Uni e si y, Vilnius, Li huania M.J. Bilinskas, I. G igelionis, M. Janulis, D. Ma isiu e, P. Pe o , T. Sabonis Cen o de In es igacion y de Es udios A anzados del IPN, Mexico Ci y, Mexico H. Cas illa-Valdez, E. De La C uz-Bu elo, I. He edia-de La C uz, R. Lopez-Fe nandez, R. Maga˜ na Villalba, A. S´ anchez-He n´ andez, L.M. Villaseno -Cendejas 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 H.A. Salaza Iba guen 19 Uni e sidad Au ´onoma de San Luis Po os´ı, San Luis Po os´ı, Mexico E. Casimi o Lina es, A. Mo elos Pineda, M.A. Reyes-San os Uni e si y o Auckland, Auckland, New Zealand D. K o check, J. Tam Uni e si y o Can e bu y, Ch is chu ch, New Zealand P.H. Bu le , R. Doesbu g, H. Sil e wood Na ional Cen e o Physics, Quaid-I-Azam Uni e si y, Islamabad, Pakis an M. Ahmad, I. Ahmed, M.I. Asgha , H.R. Hoo ani, W.A. Khan, T. Khu shid, S. Qazi Ins i u e o Expe imen al Physics, Facul y o Physics, Uni e si y o Wa saw, Wa saw, Poland G. B ona, M. Cwiok, W. Dominik, K. Do oba, A. Kalinowski, M. Konecki, J. K olikowski Sol an Ins i u e o Nuclea S udies, Wa saw, Poland T. F ueboes, R. Gokieli, M. G´ o ski, M. Kazana, K. Naw ocki, K. Romanowska-Rybinska, M. Szlepe , G. W ochna, P. Zalewski Labo a ´o io de Ins umen a¸c˜ao e F´ısica Expe imen al de Pa ´ıculas, Lisboa, Po ugal N. Almeida, P. Ba gassa, A. Da id, P. Faccioli, P.G. Fe ei a Pa acho, M. Gallina o, P. Musella, A. Nayak, P.Q. Ribei o, J. Seixas, J. Va ela Join Ins i u e o Nuclea Resea ch, Dubna, Russia I. Belo elo , P. Bunin, I. Golu in, A. Kamene , V. Ka ja in, G. Kozlo , A. Lane , P. Moisenz, V. Palichik, V. Pe elygin, M. Sa ina, S. Shma o , V. Smi no , A. Volodko, A. Za ubin Pe e sbu g Nuclea Physics Ins i u e, Ga china (S Pe e sbu g), Russia V. Golo so , Y. I ano , V. Kim, P. Le chenko, V. Mu zin, V. O eshkin, I. Smi no , V. Sulimo , L. U a o , S. Va ilo , A. Vo obye , A. Vo obye Ins i u e o Nuclea Resea ch, Moscow, Russia Yu. And ee , A. De mene , S. Gninenko, N. Golube , M. Ki sano , N. K asniko , V. Ma ee , A. Pashenko , A. To opin, S. T oi sky Ins i u e o Theo e ical and Expe imen al Physics, Moscow, Russia V. Epsh eyn, V. Ga ilo , V. Ka ano †, M. Kosso 1, A. K okho in, N. Lychko skaya, V. Popo , G. Sa ono , S. Semeno , V. S olin, E. Vlaso , A. Zhokin Moscow S a e Uni e si y, Moscow, Russia E. Boos, M. Dubinin23, L. Dudko, A. E sho , A. G ibushin, O. Kodolo a, I. Lokh in, A. Ma kina, S. Ob az so , M. Pe ilo , S. Pe ushanko, L. Sa yche a, V. Sa in, A. Snigi e P.N. Lebede Physical Ins i u e, Moscow, Russia V. And ee , M. Aza kin, I. D emin, M. Ki akosyan, A. Leonido , S.V. Rusako , A. Vinog ado S a e Resea ch Cen e o Russian Fede a ion, Ins i u e o High Ene gy Physics, P o ino, Russia I. Azhgi ey, S. Bi iouko , V. G ishin1, V. Kachano , D. Kons an ino , A. Ko able , V. K ychkine, V. Pe o , R. Ryu in, S. Slabospi sky, A. Sobol, L. Tou chano i ch, S. T oshin, N. Tyu in, A. Uzunian, A. Volko Uni e si y o Belg ade, Facul y o Physics and Vinca Ins i u e o Nuclea Sciences, Belg ade, Se bia P. Adzic24, M. Djo dje ic, D. K pic24, J. Milose ic 20 A The CMS Collabo a ion Cen o de In es igaciones Ene g´e icas Medioambien ales y Tecnol´ogicas (CIEMAT), Mad id, Spain M. Aguila -Beni ez, J. Alca az Maes e, P. A ce, C. Ba ilana, E. Cal o, M. Cepeda, M. Ce ada, M. Chamizo Lla as, N. Colino, B. De La C uz, A. Delgado Pe is, C. Diez Pa dos, D. Dom´ ınguez V´ azquez, C. Fe nandez Bedoya, J.P. Fe n´ andez Ramos, A. Fe ando, J. Flix, M.C. Fouz, P. Ga cia-Abia, O. Gonzalez Lopez, S. Goy Lopez, J.M. He nandez, M.I. Josa, G. Me ino, J. Pue a Pelayo, I. Redondo, L. Rome o, J. San aolalla, M.S. Soa es, C. Willmo Uni e sidad Au ´onoma de Mad id, Mad id, Spain C. Albaja , G. Codispo i, J.F. de T oc´ oniz Uni e sidad de O iedo, O iedo, Spain J. Cue as, J. Fe nandez Menendez, S. Folgue as, I. Gonzalez Caballe o, L. Llo e Iglesias, J.M. Vizan Ga cia Ins i u o de F´ısica de Can ab ia (IFCA), CSIC-Uni e sidad de Can ab ia, San ande , Spain J.A. B oche o Ci uen es, I.J. Cab illo, A. Calde on, S.H. Chuang, J. Dua e Campde os, M. Felcini25, M. Fe nandez, G. Gomez, J. Gonzalez Sanchez, C. Jo da, P. Lobelle Pa do, A. Lopez Vi o, J. Ma co, R. Ma co, C. Ma inez Ri e o, F. Ma o as, F.J. Munoz Sanchez, J. Pied a Gomez26, T. Rod igo, A.Y. Rod ´ ıguez-Ma e o, A. Ruiz-Jimeno, L. Scodella o, M. Sob on Sanudo, I. Vila, R. Vila Co abi a e CERN, Eu opean O ganiza ion o Nuclea Resea ch, Gene a, Swi ze land D. Abbaneo, E. Au ay, G. Auzinge , P. Baillon, A.H. Ball, D. 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