PoS(EPS-HEP 2013)215 http://pos.sissa.it/ is measured for the first time. Also ) Z − W ( σ / ) Z + W ( σ (on behalf of CMS collaboration) ∗ jorge.duarte.campderros@.ch Speaker. new world leading sensitivity constrains onmode. anomalous triple gauge couplings are set on the ZZ We present the WW, WZanomalous and triple-gauge ZZ boson production couplings crossproton performed sections collisions by produced measurements at the and a CMS constraints centre-of-massments energy collaborations have on of been using updated 7 using and - the 8 fullparticular TeV available at WZ luminosity at LHC. for 7 the Several TeV 7 measure- and TeV and ZZis 8 at presented TeV 8 runnings, and TeV. A in the CMS’s new cross WZ section cross-section measurement ratio at 8 TeV ∗ Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. c The European Physical Society Conference on18-24 High July, Energy 2013 Physics Stockholm, Sweden Jordi DUARTE CAMPDERROS WW, WZ, and ZZ production at CMS Universidad de Cantabria/CSIC E-mail: PoS(EPS-HEP 2013)215 . , ] ± 3 ) and miss T WW E channel syst. miss T → ( E ν 5 H . ` 4 ν ` ± ) → . The measurement stat. ( j j WW 0 . ν 2 ` . This selection require- ± 5 miss T . E Jordi DUARTE CAMPDERROS integrated luminosity of data. The 1 − are expected to take place at the LHC and 0 pb. The measured cross section at 8 TeV . 2 WZ ± 0 . In addition a jet veto is applied to reduced the . and 2 o , selects the signal region by requiring exactly two decaying semileptonically 1 ] using 3.5 fb ZZ − 2 165 , pb is compared with the predicted one at NLO with the WZ > ) 15 GeV and the two-lepton system are almost back-to- + ) WW jet > lumi. WW pb. The measurements are slightly higher than the prediction in ( ``, T 1 6 4 ( , and a binned maximum-likelihood fit to the dijet invariant mass . . . E 1 2 1 φ 3 − + ∆ and at 8 TeV [ 3 ± . ) 1 − production cross section has been measured in the syst. X ( 6 + . 5 ± WW ) → ] using 4.9 fb ] performed in CMS using 5.0 fb stat. pb. The theoretical prediction at next-to-leading (NLO) order provided by MCFM [ 1 ( 4 pp ) 8 . jets and one isolated lepton in addition to high amount of 2 t p ± The measurement of a diboson production using a hadronic decay for one boson can exploits The diboson production processes In this note, we present the 7 TeV and 8 TeV measurements of WW, WZ and ZZ diboson The lumi. 9 ( . 2 . and MSTW08 parton distribution functions is 47 high- has been used to extract the signal yield and measures the cross section. 69 both cases. Notice that the expected contribution of the decay product of the SM Higgs, the higher branching ratio withIn respect return, to the the jet resolution full doesmeasure leptonic not the decay, allow total which to cross is separate section around the for 6 W and times Z lower. mass, however it is possible to signal region is selectedThe by QCD requiring and two isolate W+Jetston leptons production producing with can a opposite fake mimictight charge lepton. the requirement and signal This in large when background isolationods. a is and rejected jet identification The by and is Drell-Yan defining estimated background mis-identifiedby the is using as requiring lepton reduced standard a than objects by data-driven lep- any with applying meth- a a jet Z-veto with and high amount of same MCFM+MSTW08, 57 is around 4% and it is not included in the theoretical prediction. at 7 TeV [ ments mitigate the Drell-Yan, QCD andcompared top to backgrounds, signal, but see the Figure W+jets background is still huge WW, WZ, and ZZ production at CMS 1. Introduction at 7 TeV [ back in the transverse plane, production based in the proton-protonand collision 2012. data We collected present also by searches CMS for detectors aTGC at using LHC the WW, in WZ 2011 and ZZ2. channels. Cross section measurements their cross sections, as well asin detailed the kinematic framework differential of distributions, the aretests Standard precisely of Model predicted the (SM). Quantum The Cromodynamics crossdeviation (QCD) from section the and measurement SM the predictions provide of Electroweak excellent theindicate (EW) diboson the sectors. production presence of rates anomalous or Any triple-gauge kinematic measured boson distributions couplingsbeyond would (aTGC) the or other SM. physics Furthermore, processes theSM diboson Higgs processes searches, are themselves as sources wellprecise of diboson as background production searches to cross for section the new measurementspredictions as phenomena. of well these as Therefore, processes. reliable it and is accurate theoretical mandatory to have top background. The cross1 section at 7 TeV was measured to be 52 PoS(EPS-HEP 2013)215 ) → syst. pp ( ( σ 04 . / 0 ) . The 8 TeV X ± ) + 006 003 pb. Both mea- . . and at 8 TeV us- 0 0 Z 2 8 . . + − 1 + 1 0 stat. 003. Both reported − ( . + − W 0 0 776 . 25 . . ± → 0 ± pp 724 . ( for the undetected neutrino. 94 σ . Jordi DUARTE CAMPDERROS TeV = 7s = TeV miss T E (GeV) jj , -1 (a) pb to be compared with the NLO pre- has been performed in the full leptonic m fb dt = 5.0L dt = fb ) X + lumi. ( ZZ and the prediction 1 5 . ) 3 0 ∫ → pb. The 8 TeV measurement was obtained to be ]. The leptonic channel is a clean signature which ± 5 ) syst. pp 5 7 . . ( pb and the NLO prediction is 22 0 0 has been measured to be 1 − + ) 03 ) . 8 syst. . ( 0 W+jets top QCD Z+jets data WW/WZ X 1 . ± + lumi. 1 50 100 150 channel [ ) ( Z 1 CMS ± , when a lepton was lost due to detector acceptance. The Fig- . − 0 `` ) 1 0 ` stat. ν W 2 (

` ± `

500 ) Events / GeV / Events 2 stat. 12 → 1500 1000 . ( → 0 3 . → cross section has been measured at 7 TeV using 4.9 fb pp isolated leptons and high amount of 1 syst. ± ( ( X t WZ σ ± 1 ZZ p . 81 / + . 8 1 ) . X ± show the invariant mass of the Z dilepton system for 7 and 8 TeV, respectively; WZ ) in the + Figure 1: Dijet invariant mass for the WW+WZ cross section analysis 1 Z 2b → − + stat. . The observable takes advantage of the cancelation for the luminosity uncertainty and ( ) pp 8 W . and X 0 → + 2a ± The same signal definition but split into two regions regarding the charge of the W-lepton can- The cross section measurement of the The Z 7 pp . − ( didate, has been used to evaluated the production cross section ratio surements are slightly higher than the SM predictions. ing 19.6 fb 24 of the high reduction of somesource systematics of related systematic with has the to background be estimation.charged introduced However, leptons, to a take although new into the account effect the inratio efficiency is the ratio sensitive between ratio to opposite measurement the parton is distribution smallin function (around the ratio 3%). of proton positive with The versus increased negatively expected charged sensitivityσ quark to the sea quark contributions at higher energies. The ratio results are in good agreement with the SM predictions. it can be appreciatedmeasured the to be high 20 signal over background ratio. The cross section at 7 TeV was at 7 TeV and the SMmeasurement prediction was at 1 NLO using using MCFM+MSTW08 is 1 WW, WZ, and ZZ production at CMS requires three high- diction with MCFM+MSTW08 of 17 ures Furthermore, there is smallmis-identified backgrounds as due leptons. toisolation instrumental These criteria. effects: fakes leptons Although particles are isis (jets rejected small coming especially) by compared from requiring with the tight the identification signal, and the only irreducible background W PoS(EPS-HEP 2013)215 , 1 ± − ) . leading stat . In this ( ) 1 5 . W 0 θ -1 ( 2 ± 110 and 19.6 fb 110 [GeV] 7 ll 1 . m tan − γ κ ∆ 100 100 − = 8 TeV, L = 19.6 fb L TeV, = 8 s Z 1 , opposite charged, same (7) γ t g ZZ (15) Z VVV (38) WV (3) p ∆ 90 90 Jordi DUARTE CAMPDERROS = Z pb and the NLO prediction using (b) 8 TeV κ ) ∆ 80 80 . ZZ ZZ WW data (1480) all (1395) WZ (1184) data-driven (149) 4 pb. Both measurements are in good . WW,WZ and lumi 0 ( CMS Preliminary Z ] with parameters given in Table 70 70 1 ± λ 1 . 0 2 0 8 Z 1

2.5 1.5 0.5 0 7

200 100 300 g

entries / 1 GeV 1 / entries .

= data / prediction / data ∆ γ ± Z γ γ 5 5 , κ f f ) λ Z . ∆ , , 4 , κ γ Z 4 γ 4 ∆ sys ( , 120 4 3 Z . . 0 0 [GeV] λ Z + − M ) . ] using an integrated luminosity of 5.0 fb all channels 7 γ Est. backgrounds Z stat 100 γ λ ( 8 9 . . Z f 0 0 WZ ZZ Data γ − + Coupling Parameters Channels ZZZ f Z TeV WW WWZ 2 7 4 pb. The 8 TeV cross section was measured to be 7 . . decay mode. The main source of background is instrumental, due -1 0 80 gauge respecting of aTGCs [ ± ττ ] and 8 TeV [ (a) 7 TeV ) 3 6 Table 1: List of aTGC parameters used for searches . 1 , and the NLO SM predicts 7 ( ) → . L dt = 4.9 fb U ∫ ZZ × CMS Preliminary CMS Preliminary 60 lumi ) ( Figure 2: Dilepton invariant mass for the WZ cross section analysis 2 0 1 3

3 2 0 (

50 .

100 exp / data

0 Events / 2 [GeV] 2 / Events SU ± ) . Any deviation from the triple- couplings fixed in the SM by the gauge structure syst ( 6 . of the EW theory indicatessuch new anoumalous physics. triple-gauge boson It couplings (aTGC) isWe and use possible be an to compared deduce to the a experimental effective data. lagrangian featuring agreement with the SM predictions. 3. Anomalous triple-gauge boson couplings 0 MCFM+MSTW08 is 6 channel both in 7 TeV [ parametrization the following relationships exist to three independent parameters. All these parameters are equal to zero in the SM. WW, WZ, and ZZ production at CMS respectively. The signal region selection requires two pairs of high- to particles mis-identified as leptons,This background mimicking is the highly signal reduced mainlycross using section in tight at WZ+jets identification 7 or and TeV isolation Z+jets was criteria. 6 events. The measured flavor and isolated leptons compatibles withby two on-shell including Z the bosons. The signal region is expanded PoS(EPS-HEP 2013)215 ) ver- W , Z = have found no V ( ZZZ ZZ , whereas the 8 TeV and 1 WWV − ) has been tested using and Z γ γ , modes have been used to Z Z WZ cross section at 8 TeV using ZZ = , Jordi DUARTE CAMPDERROS V ZZ ( and ] at 1.1 fb WW 9 has been measured at 7 and 8 TeV ) ZVZ WZ (b) Limits on Z , − W cross section, among other SM productions, ( WW σ analysis at 7 TeV has been released with the / ZZ ) Z 5 + WZ and summarizes the diboson production measurements and the transverse momentum of the leading lepton W cross section production have been presented for the 4 ( WZ σ WZ ZZ + + ] modes have been used to probe the 4 and [ at 95% of confidence level. WW WW , , updating the previous one [ WWW 1 3b WZ WZ − , + WW and shows the limits obtained at 95% confidence level together with pre- , for the WW WW 3a j j t WWZ p ] and data from the 8 TeV run, considerably improving previous limits in the related 2 1 ][ − 1 [ Figure 3: Anomalous triple-gauge bosons limits at 95% confidence level case. Figure (a) Limits on of integrated luminosity. Figure WW 1 − WW Measurements of the The aTGC are expected to modify the total production rates as well as kinematics distributions, The 4. Summary performed at CMS to date, the tex, setting limits on the respective parametersof . the The diboson limits system, was set using the transverse momentum the full 19.6 fb parameters. The limits haveThese limits been are extracted shown in using Figure the invariant mass of the four lepton system. is a new measurement at CMS. The ratio are compared with to their theoreticalperform searches prediction. for The aTGC, obtaining noin deviations these from channels. SM predictions. Limits on aTGC are set vious results from LEP, D0 and ATLAS. The neutral vertex in the 7 TeV and 8 TeVfull center available of luminosity, 4.9 mass energy. fb The in particular, the boson transverse momentumThe and expected the number diboson of signal invariant mass, events canaTGC both be at parameters. written high as values. function The of searches the SM for cross aTGC section plus using some the channels WW, WZ, and ZZ production at CMS deviation from the SM values, and inhave absence been of set. deviations, upper limmits on the aTGC parameters for the first time. Also, this19.6 note fb shows the updated results for the PoS(EPS-HEP 2013)215 , TeV and 7 = s , Physics Analysis √ ] , -1 γ CMS ] WV (2013) 063, 19.3 fb ] SMP-013-009 , submitted to -1 -1 Nucl.Phys.Proc.Suppl. ZZ , 1301 Jordi DUARTE CAMPDERROS 4.9 fb 19.6 fb WZ -1 -1 JHEP , 4.9 fb 3.5 fb WW 7 TeV CMS measurement TeV 7 CMS measurement TeV 8 Theory prediction TeV 7 Theory prediction TeV 8 limitCMS 95%CL CMS-PAS-SMP-12-006 Probing the Weak Boson Sector in -1 TeV , hep-ex/1210.7544 7 EPJC C13 2283 (2013) (WV) 5.0 fb WW+WZ = hep-ex/1301.4698 s γ SMP-12-006 (WZ), 12-005 (WW7), 13-005(ZZ8) Z -1 hep-ex/1301.4698 hep-ex/1306.1126 √ JHEP 1301 063 (2013) (ZZ7), PLB 721 190 (2013) (WW8) , ] ,l) > 0.7 6 γ γ 5.0 fb > 15 GeV EWK-11-009 γ R( T W ∆ E (2013) 2283, [ 4j ≥ 3j ≥ Z C73 (1987) 253 2j ≥ -1 1j (2013) 190-211, [ ≥ | < 2.4 (2013) 190-211, [ 4j MCFM for the Tevatron and the LHC > 30 GeV jet B282 ≥ η 36, 19 pb jet T , | 721 3j JHEP 10 132 (2011) JHEP 01 010 (2012) E ≥ SMP-12-011 (W/ZTeV) SMP-12-011 8 and WWZ couplings 721 W 2j , γ ≥ Eur.Phys.J. ] , 1j hep-ph/1007.3492 , Physics Analysis Summary, ≥ July 2013 Measurement of the WW, WZ and ZZ cross sections at CMS Measurement of the sum WW and WZ production with W+dijet events in pp Measurement of W+W- and ZZ production cross sections in pp collisions at Measurement of the W+W- Cross section in pp Collisions at Measurement of W+W- and ZZ production cross sections in pp collisions at Measurement of WZ production rate Measurement of the ZZ production cross section and search for anomalous TeV 3 2 5 4 1 -1 Nucl.Phys. 7 , 10

10 10 10 10 10

− = Phys. Lett. B

tot

Production Cross Section, Section, Cross Production [pb] , s σ W Phys. Lett. B √ , + http://cds.cern.ch/record/1564318 W (2010) 10-15, [ =8 TeV Figure 4: Cross section measurements at CMS and their theoretical predictions − → ) ∗ s e ( + hep-ex/1211.4890 CMS-PAS-EWK-11-010 http://cds.cern.ch/record/1370067 collisions at sqrt(s) = 8 TeV 205-206 [ e p couplings in 2 l2l ’ final states in pp collisions at Eur. Phys. J. C Summary, Limits on Anomalous WW [9] CMS Collaboration, [8] K. Hagiwara, R. D. Peccei, D. Zeppenfeld and K. Hikasa, [7] CMS Collaboration, [1] CMS Collaboration, [5] CMS Collaboration, [6] CMS Collaboration, [4] CMS Collaboration, [3] J. M. Campbell and R. K. Ellis, [2] CMS Collaboration, References WW, WZ, and ZZ production at CMS