A measurement of the ZZ production cross section in proton-proton collisions at ????????? = 7 TeV using data recorded by the ATLAS experiment at the Large Hadron Collider is presented. In a data sample corresponding to an integrated luminosity of 4.6 fb-1 collected in 2011, events are selected that are consistent either with two Z bosons decaying to electrons or muons or with one Z boson decaying to electrons or muons and a second Z boson decaying to neutrinos. The ZZ ????????? ????????? + ????????? - ????????? ?????????+ ????????? ?????????- and ZZ ????????? ????????? + ????????? - ?????????v??????v cross sections are measured in restricted phase-space regions. These results are then used to derive the total cross section for ZZ events produced with both Z bosons in the mass range 66 to 116 GeV, ??????ZZ tot = 6.7 ?????? 0.7 (stat.) -0.3 +0.4 (stat.) ?????? 0.3 (lumi.) pb, which is consistent with the Standard Model prediction of 5.89-0.18 +0.22 pb calculated at next-to-leading order in QCD. The normalized differential cross sections in bins of various kinematic variables are presented. Finally, the differential event yield as a function of the transverse momentum of the leading Z boson is used to set limits on anomalous neutral triple gauge boson couplings in ZZ production. ?????? 2013 Cern for the benefit of the ATLAS collaboration.
Measurement of ZZ production in pp collisions at ????????? = 7 TeV and limits on anomalous ZZZ and ZZ?????? couplings with the ATLAS detector / Aad, G.; Aloisio, Alberto; Alviggi, Mariagrazia; Canale, Vincenzo; Cevenini, Francesco; Chiefari, Giovanni; DELLA VOLPE, Domenico; Merola, Leonardo; Patricelli, Sergio; Conventi, Francesco; DELLA PIETRA, Massimo; Giordano, Raffaele; Musto, Elisa; Rossi, Elvira; SANCHEZ PINEDA, ARTURO RODOLFO; Carlino, Gianpaolo; de Asmundis, Riccardo; Di Donato, Camilla; Doria, Alessandra; Iengo, Paolo; Izzo, Vincenzo; Sekhniaidze, Givi; Al, e. t. .. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1126-6708. - 128:(2013), pp. 1-47. [10.1007/JHEP03(2013)128]
Measurement of ZZ production in pp collisions at ????????? = 7 TeV and limits on anomalous ZZZ and ZZ?????? couplings with the ATLAS detector
ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CANALE, VINCENZO;CHIEFARI, GIOVANNI;DELLA VOLPE, DOMENICO;MEROLA, LEONARDO;PATRICELLI, SERGIO;DELLA PIETRA, MASSIMO;GIORDANO, RAFFAELE;Rossi, Elvira;SANCHEZ PINEDA, ARTURO RODOLFO;
2013
Abstract
A measurement of the ZZ production cross section in proton-proton collisions at ????????? = 7 TeV using data recorded by the ATLAS experiment at the Large Hadron Collider is presented. In a data sample corresponding to an integrated luminosity of 4.6 fb-1 collected in 2011, events are selected that are consistent either with two Z bosons decaying to electrons or muons or with one Z boson decaying to electrons or muons and a second Z boson decaying to neutrinos. The ZZ ????????? ????????? + ????????? - ????????? ?????????+ ????????? ?????????- and ZZ ????????? ????????? + ????????? - ?????????v??????v cross sections are measured in restricted phase-space regions. These results are then used to derive the total cross section for ZZ events produced with both Z bosons in the mass range 66 to 116 GeV, ??????ZZ tot = 6.7 ?????? 0.7 (stat.) -0.3 +0.4 (stat.) ?????? 0.3 (lumi.) pb, which is consistent with the Standard Model prediction of 5.89-0.18 +0.22 pb calculated at next-to-leading order in QCD. The normalized differential cross sections in bins of various kinematic variables are presented. Finally, the differential event yield as a function of the transverse momentum of the leading Z boson is used to set limits on anomalous neutral triple gauge boson couplings in ZZ production. ?????? 2013 Cern for the benefit of the ATLAS collaboration.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.