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Dibosons from CMS ArabellaMartelli12,a 1 PhysicsDepartment,Universita´ degliStudidiMilanoBicocca, PiazzadellaScienza3,20156Milano,Italy 2 LaboratoireLeprince-Ringuet,EcolePolytechnique, 91128PalaiseauCedex,France 2 Abstract. Itish√erepresentedthedibosonproductioncrosssectionmeasuredbytheCMScollaborationin pp 1 collisionsdataat s=7TeV.WγandZγresultsfrom2010analyses(36pb−1)arepresentedtogetherwith2011 0 firstmeasurementsofWW,WZandZZfinalstatesobtainedusing1.1fb−1.Resultsobtainedwith2010dataare 2 alsointerpretedintermofanomaloustriplegaugecouplings. n a J 1 Introduction 2 Wγ and Zγ production cross section 2 2 Wγ and Zγ diboson processes are studied with analyses ] The diboson production is a direct probe of the Standard sharing similar strategy and techniques. W bosons are re- x constructedifonlyoneisolatedleptonwith p >20GeV/c Model. Its high sensitivity to the self-interaction between T e is found together with a missing transverse energy above p- gSaUug(2e)b×osUon(1s)isgaaudgierescytmcomnesterqyuoenfcteheofStMheannodn-iasbefulilalny 25GeV/c,whiletheZ candidatesareselectedlookingfor e two isolated leptons with p >20 GeV/c and a dilepton fixedintheSMbythegaugestructureoftheLagrangian. T h invariant mass above 50 GeV/c2. For both analyses, only AnydeviationoftheSMcouplingsisanindicationofnew [ photonswith p >10GeV/careconsidered. physics, manifested as an increased production cross sec- T 1 tionforinstance. M(cid:112)oreoveranangularseparationintermsof∆R(γ,lepton)= v The measurement of triple gauge boson couplings (TGC) (∆η)2+(∆φ)2 >0.7isrequired. 6 isalsoanimportanttestoftheSMasausefulsteptoestab- Themainbackgroundsareduetojetsmisidentifiedaspho- 9 lishmajorbackgroundstotheelectroweaksearches.More- tons and are estimated with data driven techniques. Both 5 over,anumberofextensionsoftheSMcanmanifestthem- W+jetsandZ+jetsbackgroundcontributionsareestimated 4 . selves in processes with multiple bosons in the final state by measuring the probability for a jet to be identified as 1 andameasurementofTGCscanbesensitivetonewphe- a photon candidate in a sample of multi-jet QCD events 0 nomena at high energies, that would require more energy containingatleastonehigh-qualityjetcandidate,andthen 2 orluminositytobedirectlyobserved. folding this probability with the non-isolated photon can- 1 : Within the SM, using the effective Lagrangian approach, didatesobservedintheWγandZγsamples. v gV,kV,λ and hV,hV operators are used to describe the Sinceonlyelectronsandmuonsfinalstatesareconsidered, Xi ch1arg1edV[5] and3neu4tral [6] couplings respectively, which thefractionofWγeventsdecayingintotausaresubtracted are Lorentz and SU(2) × U(1) invariant and conserve C as a background, once estimated from the simulation (or- r a andPseparately.Inthefollowingthe95%CLintervalsfor der3%). anomalousTGCsarepresented,usingtheHISZparametriza- tion.Noform-factorisusedintheinterpretationofthere- The number of events observed in data and estimated sults in order not to make any assumption on the energy forthebackgroundsineachleptonicfinalstateisshownin dependencyofnewphysicsthatwouldensurepartial-wave Table 1 for the Wγ and in Table 2 for the Zγ analysis[1]. unitarity. Noeventisobservedwithmorethanonephotoncandidate inthefinalstate. A complete description of the detector and informa- tionsaboutobjectsreconstructioncanbefoundin[4].The Table 1. Number of events observed in data and background analyses here presented use data from pp collisions at 7 eventyieldineachleptonicfinalstateattheendoftheWγanal- TeVregisteredbytheCMSdetectorin2010(36pb−1)and ysis,for(cid:82) Ldt=36pb−1. 2011(1.1fb−1),focusingonthefullyleptonicfinalstates reconstructedwithhighefficiencyoveraverywideaccep- Finalstate N W+ jet otherrelevantbackgrounds obs. tance. Results are presented in the following, with a brief descriptionofthedibosoneventsselection. eν 452 220±16±14 7.7±0.5 µν 520 261±19±16 16.4±1. a e-mail:[email protected] EPJWebofConferences Table 2. Number of events observed in data and background remaining top background is estimated from data as well eventyieldineachleptonicfinalstateattheendoftheZγanaly- byusing“top-tagged”eventsandapplyingthecorrespond- (cid:82) sis,for Ldt=36pb−1. ingtaggingefficiency,whichismeasuredinadatacontrol 4.3 BackgroundEstimation sample.TheresidualZ bosoncontributiontothee+e7− and Finalstate Nobs. Z+ jet µ+µ− finalstatesareestimatedbynormalizingthesimula- tion to the observed number of events inside the Z mass ee 81 20.5±1.7±1.9 µµ 90 27.3±2.2±2.3 windowindata. Thenumberofexpectedsignalandbackgroundevents, for the processes controlled with the simulation and with Themainsystematicuncertaintyisduetotheestimate data-driventechniquesarereportedinTable3[2]. of backgrounds from data and amounts to ∼6% for Wγ andto∼10%forZγ.Othersignificantsourcesofsystem- atic uncertainties are from the PDF modeling and photon Table3.Numberofeventsobservedindataandexpectedevent energyscale,contributingby∼5%forallfinalstates. yieldforsignalandbackground,estimatedfromdataandsimu- The Wγ cross sections measured in each final state are lationfor(cid:82) Ldt=1.1fb−1,afterapplyingtheWW selectionre- weighted taking intocaccount correlated uncertainties be- qcuir1e5m0ents. tweenthetworesultsV/.Thecom dbatianedc troopssseCcMtiSo npsreilisminary V/ data top CMS preliminary e e G WW WZ/ZZ L = 1.1 fb-1 GSample WW WZ/ZZ Yield L = 1.1 fb-1 σ(pp→W5 γ15+0X)× Z+Bje.tsR.(W W+→jets lν)= 5 Z+jets W+jets s / s / qq→W+W− 349.7±30.3 56.3±5.0(stentrieat.)±5.0(syst.)±2.3(lumi.) entriegWg1+0→0jeWts+W− 1170.62.9±±13.68.9 Thisresultagreesw1e0l0lwiththeNLOprediction[8]of tt¯+tW 63.8±15.9 49.4±3.8pb. Z/γ∗→ll+WZ+ZZ 12.2±5.3 Byfollowingthesameprocedure,thecorrespondingcross Z/γ5∗0→ττ 1.6±0.4 sectionmeasuredforthe50Zγproductionis WZ/ZZnotinZ/γ∗→ll 8.5±0.9 W+γ 8.7±1.7 σ(pp→Zγ+X)×B.R.(Z →ll)= Signal+Background 568.6±52.2 9.4±1.0(stat.)±00.6(syst.)±0.4(lumi.) Data0 626 0 20 40 60 80 100 0 50 100 150 The theoretical NLO prediction [6] is 9.6 ±pl,0m.in4 [GpebV,/c] pl,max [GeV/c] T T whichisinagreementwiththemeasuredvalue. The spectrum of the projected-MET at the end of the (a) eventselectionissh(obw) ninFigure1. 3 WW production cross section 2 V V/c data top CMS preliminary Ge data top CMS preliminary The signature lookedGefo6r0a WW WWevent WcZ/oZZnsists in exL a= c1.t1l fby-1 6 150 WW WZ/ZZ L = 1.1 fb-1 twtwoigothewthpeeTlrlwi>sio2thl0a(at1es0di)glenGpifietntries / 5 oVcna/snc4t0afmmoriosntshi gZne+jegetllseetracadtnrio snWvng+jesetrs(astnreadeilnmineurggo)ynlse(MpotnoElnyT,,) entries / 100 Z+jets W+jets toaccountforthetweoneutrinos. For this purpose a particular variable is used, namely the missingtransverseenergyisprojectedalongthedirection oftheclosestleptonand2i0tsorthogonalcomponentisused 50 asdiscriminatingvariableincasetheangle∆φ(MET,lepton) issmallerthanπ/2.This“projected-MET”isparticularly suitabletorejecteventual0Z →ττdecays,incaseofboosted 0 Z. It is required above 400GeV fo5r0the sam10e0flavo1r5W0 de-200 0 50 100 150 cays(ee,µµ)andabove20GeVfortheeµchannelms. [GeV/c2] projected Emiss [GeV] ll T Somefurthercutsarerequiredtoreducethecontamination from background processes with jets, h(ce)avy hadrons and Fig.(cid:82)1.Projected-MET(ds)pectrumshownfordataandexpectation mis-recoFnisgtruurcete1d:diDboisstornibcuhatinonnesls,.aEfvteenrtsWar+eWrejecsteedleicftion ffoorr 1L.1dft=b1.11fobf−1d,faotrath,eoefvetnhtsesturraviivliinnggthleepWtWonseplection. containing jets with p >30 GeV/c, a further vet−o is ap- − T (a), leading lTepton p (b), dilepton invariant mass (c) and the min(proj ,proj ). Each plied on “top-tagged” jets accouTnting also for soft muons MET trk-MET fromb-qcuoamrkpdoecnaeynst.TinofsuimrthuerlarteidounceisthsecDalreedll-tYoandabatac-kd-rivenesTtihmeamteajso.rsystematicuncertaintyisfromthebackground ground, events with a dilepton e+e−, µ+µ− invariant mass estimationfromdata(order20%),while∼8%accountsfor thesignalefficiency.Thesignalacceptancecorresponding within15GeV/c2 oftheZ arevetoed.Finallytheanglein to the selection described is order 70% of the total phase the transverse plane between the dilepton system and the space. By using the W → lν branching fraction, the WW most energetic jet with p >15 GeV/c is required to be T productioncrosssectionismeasuredtobe smallerthan165degrees,intheee/µµfinalstates,tocope withZeventswherethebosonrecoilsagainstajet. σ(pp→WW+X)=55.3±3.3(stat.)±6.9(syst.)±3.3(lumi.) The main backgrounds are estimated directly from data. The fake rate measured on jets enriched data samples al- ThismeasurementisconsistentwiththeSMexpectationof lows to estimate W+jets and QCD multi-jet events. The 43±2pbatNLO[7]withinonestandarddeviation. 5.2 BackgroundEstimation 11 GeV 103 CMS Preliminary 2011 s = 7 TeV !L dt = 1.09 fb-1 GeV 18CMS Preliminary 2011 s = 7 TeV !L dt = 1.09 fb-1 nts / 2 102 DVZ+aVtJaets WtWt+ZJ#et3sl"Hadronnts / 2 Col11l46iderPhysicsSymposiumDVZ+aVtJ2aet0s11WtWt+ZJ#et3sl" ve 10 ve 12 E E 10 4 W1Z production cross section 8 leptonselectionandthebackgroundcontrol.Inparticulara 6 20%systematicuncertaintyisassignedtoZZ andZγpro- In t1h0-1e WZ → l(cid:48)νl+l− channel, three isolated lepto4ns are cesses,whichareestimatedfromthesimulationbeingmi- loo1k0-e2dforconsideringelectronsandmuonsonly.Le2ptons norbackgrounds,whileasystematicuncertaintyof∼5%is candi6d0ates7f0romZ80deca9y0sare10fi0rsts1e1l0ecte1d20withpT >06200,1070 a80ssign9e0dtot1h00epro11c0esse1s20controlledfromdata. GeV/cforelectronsand pT >15,15meZGe (GeVeV/)cformuonsand ThecrosssectionsmmeZe e(GaesVu)redchannelbychannelwithinthe twGeVhieth1Z0i3nbCtMohSse Porernliamininsgarcye 2h0[o161s0e,n1s a2= s70 T]tehVGeebVe/s!ctL2 id.nt =Tv 1ha.0r9e ifnab-1nattmhiardssGeVlecpatn1o6dnCidMsSaa Pttre-eliminary 20Zb11lebo5ss. =o 7Tn ThemVeaisnscrl!uaL nsdtig =v e1e.0[9W 6fb0-1Z, 1c2r0o]ssGseeVct/ico2narise rceopmoprtuetdedinaTsaa- itpEvents / 2 srTafyn1>i1s0n02v2ge0rtsGiegeheVtn/iecdrgeisnytri(efiaqcbuaoitvrieoedn3aa0sDVZn+aVGdwtJaeteesiVsllo)WtWtala+ZsaJ#tseiatos3slo"nscigcianrtiietfiedcriataEvents / 2 ontatnmh111d024eiswnsieinuthg- Table5.WDVZZ+aVtJaectsrosWtWst+ZsJ#eetc3slt"ionsfor(cid:82) Ldt=1.1fb−1perchannel. trinosotoselecteventscontainingalsoaW boson.Events 1 8 withasecondZcandidatereconstructedarerejected. Finalstate crosssection(pb) 6 The10-d1ileptoninvariantmassdistributionforeventssurviv- 4 eee 0.086±0.022(stat)±0.007(syst)±0.005(lumi) ingthesignalselectionispresentedinFigure2forsimula- 10-2 2 eeµ 0.060±0.017(stat)±0.005(syst)±0.004(lumi) tionanddata. 0 µµe 0.053±0.018(stat)±0.004(syst)±0.003(lumi) 60 70 80 90 100 110 120 60 70 80 90 100 110 120 mµµ (GeV) µµµ 0.06m0µ±µ (G0.e0V1)6(stat)±0.004(syst)±0.004(lumi) Z Z CMS Preliminary 2011 s = 7 TeV CMS Preliminary 2011 s = 7 TeV GeV 103 !L dt = 1.09 fb-1 GeV 35 !L dt = 1.09 fb-1 2 Data W+Jets 2 30 weightedmDeaatantaWk+iJnetgs intoaccountthecorrelatedsystem- nts / 102 VZ+VJets tWtZ#3l" nts / 25 aticuncertaVZin+VJteitsestWatnZ#d3ul"singtheW andZbosonsbranching e e Ev 10 Ev ratios.Itismeasuredtobe 20 1 15 σ(pp→WZ+X)=17.0±2.4(stat.)±1.1(syst.)±1.0(lumi.) 10-1 10 consistentwiththeStandardModelprediction[7]. 5 10-2 0 60 70 80 90 100 110 120 60 70 80 90 100 110 120 m (GeV) m (GeV) Z 5 ZZ productioZn cross section FigureF2ig:.2D.iDleilpeptoto(cid:82)nniinnvvaarirainatnmtamssafosrsthfeoervtehntespeaess(itnogpthreofwull)WaZnd µµ channels (middle row), and for allscehleacntionne,lfsorcomLbditn=e1d.1(fbb−o1t.tom row), for events passing theThfuelZlZsefilnecatlisotnat.eiTshreecolenfsttrauncdtedoutoftwopairsofsame flavor, opposite charge, isolated leptons, using electrons, right columns show the same distributions, but represented in logarithmic and linear scales, muons and taus. To select the first Z candidate electrons respectively. Z+jetsandtt¯areestimatedfromdatawiththe“matrix- and muons only are considered, if having a p >20(10) T method”.Thistechniqueusesatag-and-probeprocedureto GeV/c for the leading(trailing) lepton and invariant mass measuretheleptonselectionefficiencyandtheprobability within[60,120]GeV/c2,whilealsotausaretakenintoac- The observables are the total number of events in these two samples. The Loose-cut sample forajettofakealepton,usingenrichedZ andZ+jetsdata count to look for the second Z. A p >7(5) GeV/c is re- containseventswiththeWcandidatesreconstructedfromeithertrueisolatedleptons(N )or T samples. ZZ and Zγ are backgrounds in case of leptons quiredforelectrons(muonlesp).Differentcriteriaareusedto fromfankoetroenceosnsftrroumctemdiosridpheonttoifinecdonjevtesrs(iNonjest)aonrdfarroemcolnetprotollnesdfromsheeleacvtytafluas,vnoaumredlyecpays>.1H0eGnecVe/cforleptonictaudecays, T thenumwibtherthoefesivmeunltastiionnt.hWisZsaemvepnltescwahnerbeebeoxspornesssdeedcaays:into p >20GeV/cforhadronictausdecays.Moreover,inpres- T tau lepton(s) are considered as background and the frac- enceoftaus,it’sthevisiblemassoftheZ bosontobere- tionofsucheventsasestimatedfromthesimulation(order quiredintherange[30,80]GeV/c2.Leptonsarerequired N = N +N (1) 6%) is subtracted to the same numbloeorseof evenletps obsejertved to be isolated, the isolation being measured based on the indata. combinationoftracker,ECALandHCALmeasurements. ThenumberofeventsintheTight-cutsamplecanbewrittenas: TheeventcountsobservedindataarereportedinTable4 Finally,acutisappliedontheleptonimpactparameterfor together with the estimated background and signal event selectedleptons. N = N +P N , (2) yield[2]. tight tight lep fake jet Leptonsfrommisidentifiedjetsorheavyhadronsdecayare where istheefficiencyfortrueisolatedleptonstopasstheaismolaaintiosonucrcuetsofarnedmPainingisbtahckegrounds.Concerningfinal tight fake stateswithtaus,alsoWZcanbearelevantbackgroundand corresponding efficiency for fake leptons. We will obtain and P from independent Table4.Numberofobservedeventsfortheindividualfinalstates tightit is estfiamkeated from simulations. Zbb in particular and tt¯ intheWZ analysis.Theoverallbackgroundeventyieldandthe areestimatedfromdata,bymeansofacontrolregionde- expectationforthesignalarealsoshown.Numberscorrespondto (cid:82) finedbyrevertingthecutontheleptonsimpactparameter. Ldt=1.1fb−1. Z+ jets is controlled by measuring the rate of jets faking electrons,muonsandtausrespectively.Forthispurposea Finalstate N Nbackg. NWZ obs. est. exp. datasampleenrichedinbackgroundisselected,byrequir- eee 22 2.98±0.78 14.47±0.28 ingaZcandidateasforthesignalplusapairofsameflavor eeµ 20 3.63±0.87 17.4±0.31 samesignleptons,withoutisolationcriteria. µµe 13 2.03±0.58 13.95±0.28 µµµ 10 3.15±0.76 18.56±0.32 The spectrum of the four-lepton invariant mass at the endoftheeventselectionisshowninFigure3forthefinal stateswithelectronsandmuonsonly. The signal acceptance corresponding to the selection InTable6thenumberofeventsobservedindata,esti- describedisorder50%ofthetotalphasespace.Concern- mated for the backgrounds and as expected for the signal ingthesystematicuncertainty,majorsourcesarefromthe arereported[2]. 20 6 ZZ ±∓±∓ (, = e,µorτ) → CMS Preliminary, s=7 TeV, 1.1 fb-1 CMS Preliminary, s=7 TeV, 1.1 fb-1 2 2 c 4 c 4 V/ DATA V/ DATA e e G G ZZ ! 2µ2e ZZ ! 4µ 0 3 0 3 s/5 Z + jets s/5 Z + jets nt nt ve 2 ve 2 E E 1 1 0 0 100 200 300 400 500 600 100 200 300 400 500 600 M (GeV/c2) EPJWebofConferences M (GeV/c2) 2µ2e 4µ CMS Preliminary, s=7 TeV, 1.1 fb-1 CMS Prewlimhiinlearfiy,x isn=g7 tTheeV,r e1m.1 afbin-1ingonestotheSMvalues. 2 2 c 7 c 4 V/ DATA V/ WithintheDWATγAandZγanalysesdescribedinsection2, Ge 6 Ge WWγ, ZZγ and Zγγ were measured, by looking at the 50 5 ZZZ + !je t4sl 50 3 spectrum of thZZZ/eW "pZ h +2o lj2et!otsn transverse energy[1]. The results s/ s/ presentedinTable7alreadyallowforagoodsensitivityto nt 4 nt theneutralanomalouscouplings. ve ve 2 E 3 E 2 1 T√asb=le77T.e9V5,%forC(cid:82).LL. ldimt=i3ts6opnb−W1.WThγe,sZeZaγreacnodmZplγeγmceonutaprlyintgosthaet 1 previousresultsonvectorbosonself-interactionsatlowerenergy. 0 0 100 200 300 400 500 600 100 200 3C0o0upli4n0g0 500 600 Parameters M (GeV/c2) M (GeV/c2) 4l WWγ 2-l21!.11<∆kγ <1.04 -0.18<λγ <0.17 ZZγ -0.07,<hZ <0.07 -0.0005,<hZ <0.0006 Figure3: DFiigs.t3r.ibDuisttriiobuntisonofofththeeffoouur-rle-pletopntroecnonrsetcruocntesdtmruascstefodrtmheassforZtγhγe2e2µ-0a.n05d,<thhe3γ <4µ0.0fi6nal-s0t.a00t0e5s,<h4γ <0.0005 finalstateswithelectronsandmuonsattheendoftheZZ event 3 4 (top). No events were observed in the 4e fi(cid:82)nal state. The bottom left plot represents the sum selection.Dataandexpectationareshownfor Ldt=1.1fb−1. of the three 4 channels. The bottom right plot represents the invariant mass of the 2l2τ final state. ThedatasamplescorrespondtoanintegratedluminosityoAflso=the1W.1Wfban1a.lysisherepresentedwasalreadyper- Table6.Numberofexpectedandobservedeventsfortheindi- − formeLdin2010providinglimitsontheWWγ,WWZ cou- vidual final states in the ZZ analysis, as well as the number of (cid:82) plings. For this purpose the discriminating spectrum used backgroundeventsestimatedfromdata,for Ldt=1.1fb−1. wastheleadingleptonp [3].ResultsareshowninTable8. T ofthevisibleinvariantmassvalue. Finalstate N Nbackg. NZZ obs. est. exp. 6.3 Back4µground2Contr0o.00l4a±n0d.00s4ys3t.e7m±0a.4tics Table 8. 95% C.L. limits on one-dimensional fit results for 4e 0 0.14±0.06 2.5±0.2 (cid:82) anomalousTGCobtainedwithintheWWanalysisfor Ldt=36 2e2µ 6 0.15±0.06 6.3±0.6 pb−1of2010dataat7TeV. 6.3.1 Bac2kl2gτround1estim0a.8te±0.1 1.4±0.1 Coupling Parameters The small number of observed events precludes a precise evaluation of the background, e.g. in a relevantTshiegpnraels-elnikteed mselaescstiownirnedduocwes,thoenlfyullfrsoigmnalthpheasmeeasurWemWeγnt of-0s.i6d1e<-b∆akγn<d0s..65We thus rely on othspearcemtoetohrdoedrs6,0b%asfoerdthoene,eµxapnedritom∼e2n0t%alfdorattaau,cfoharnt-he conWtrWoZl of th-e0.b19ac<kλgZr<ou0.n19d an-0d.2t9h<e∆gZ <0.31 nels respectively. Main sources of uncertainties are from evaluation of the associated systematics. The typical procedure consists of choosing a wide thebackgroundcontrolthroughdatadriventechniquesand backgrounthdesceolencttrioonlorfegthieolnepotountss.iAdseatnheexasmigpnlea,lap3h%assyestsepma-ce which gets populated by relaxing some cutsatiincetrhroeriesvaessnigtnseedletoctthioene,,µarnedconvsetrruicfytioinn,gwthhilaetat6h%e event rates change according to the expectatiotnotfaruos.m Monte Carlo. The control region for any givReenfebraecnkcgerosund must be chosen To include all final states in the cross section calculation carefullysinceanyorbothoftheothertworeduciblebackgrou1n.dTshme ighCtMraSpidlcyolblaebcooramtioend, omM-easurement of a simultaneous constrained fit on the number of observed inant if theeveenvtsenint saellledcetciaoyncihsanrneelalsxwedas, tpherufosrmmeadk,itnakgintgheinetoxtrapolW√atγionatnodthZeγsigpnroadlupchtioanse sinpacpep collisions at s=7 TeV, Phys. Lett. B701, (2011) 535-555, difficult. accountthesystematicuncertaintiesfound,bymeansofa doi:10.1016/j.physletb.2011.06.034 profile likelihood. The resulting ZZ production cross sec- For the mteioansuforerma epnaitroofftZheboZsobnb¯s/icnc¯tahendmatst¯sbraacnkgegr[o60u,n1d2s0,]a fou2r.-lTehpetConMSbaccokllgabrooruatniodn,cMoneatrsuorlermee-ntofWW andob- GeV/c2ismeasuredtobe servation of WZ and ZZ in leptonic modes, CMS-PAS EWK-11-010,(2011) σ(pp→ZZ+X)=3.8+1.5(stat.)±0.2(syst.)±0.2(lumi.) 3. The CMS collaboration, Measurement of W+W− pro- −1.2 duction and search for Higgs boson in pp colli- √ TobecomparedtotheStandardModelNLOpredictionof sion at s=7 TeV, Phys. Lett. B699, (2011) 25-47, 6.4±0.6pb[7]. doi:10.1016/j.physletb.2011.03.96 4. The CMS collaboration, The CMS experiment at the CERN LHC, JINST 3, (2008) S08004, 6 Limits on gauge couplings doi:10.1088/1748-0221/3/08/S08004 5. K.HagiwaraandR.D.PecceiandD.Zeppenfeld,Prob- Limitsontriplegaugecouplingsweresetusing36pb−1of ing the Weak Boson Sector in e+e− → W+W−, Nucl. datafrom2010 ppcollisionsat7TeV. Phys.B282,(1987)253 Tomeasuresuchparameters,profilelikelihoodfitsareper- 6. U.BaurandE.Berger,Probingtheweak-bosonsector formed on a relevant spectrum, taking the SM prediction in Zγ production at hadron colliders, Phys. Rev. D 47, as reference for comparison with the measurement. This (1993)4889 procedureallowstoquantifyeventualanomalouscoupling 7. C.W.JohnCampbellandKeithEllis, MCFM-Monte parameters, which would bring to an enhancement of the CarloforFeMtobarnprocesses dibosonproductioncrosssection,inparticularathighbo- 8. U.BaurandT.Han,andJ.Ohnemus,QCDcorrections son transverse momentum, if introduced in the SM La- tohadronicWγproductionwithnonstandardWWγcou- grangian. The presented 95% C.L. intervals for the mea- plings,Phys.Rev.D48,(1993)5140 suredTGCsareobtainedbyvaryingoneofthecouplings,