A measurement of the ZZ production cross section in the âââ+ââ² âââ² + and âââ+νν¯ channels (â = e, μ) in proton-proton collisions at s=8TeV at the Large Hadron Collider at CERN, using data corresponding to an integrated luminosity of 20.3 fbâ1 collected by the ATLAS experiment in 2012 is presented. The fiducial cross sections for ZZ â âââ+ââ² âââ² + and ZZâ âââ+νν¯ are measured in selected phase-space regions. The total cross section for ZZ events produced with both Z bosons in the mass range 66 to 116 GeV is measured from the combination of the two channels to be 7.3 ± 0.4(stat) ± 0.3(syst)â 0.1â 0.2(lumi)âpb, which is consistent with the Standard Model prediction of 6. 6â 0.6+ 0.7 pb. The differential cross sections in bins of various kinematic variables are presented. 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.[Figure not available: see fulltext.]
Measurement of the ZZ production cross section in proton-proton collisions at sqrt(s)=8 TeV using the ZZ -> l-l+l-l+ and ZZ-> l-l+ nu nubar decay channels with the ATLAS detector
BARBERIS, DARIO;FAVARETO, ANDREA;FERRETTO PARODI, ANDREA;GAGLIARDI, GUIDO;GAUDIELLO, ANDREA;GUIDO, ELISA;MIGLIORANZI, SILVIA;OSCULATI, BIANCA MARIA;PARODI, FABRIZIO;SANNINO, MARIO;SCHIAVI, CARLO;Sforza, F.;
2017-01-01
Abstract
A measurement of the ZZ production cross section in the âââ+ââ² âââ² + and âââ+νν¯ channels (â = e, μ) in proton-proton collisions at s=8TeV at the Large Hadron Collider at CERN, using data corresponding to an integrated luminosity of 20.3 fbâ1 collected by the ATLAS experiment in 2012 is presented. The fiducial cross sections for ZZ â âââ+ââ² âââ² + and ZZâ âââ+νν¯ are measured in selected phase-space regions. The total cross section for ZZ events produced with both Z bosons in the mass range 66 to 116 GeV is measured from the combination of the two channels to be 7.3 ± 0.4(stat) ± 0.3(syst)â 0.1â 0.2(lumi)âpb, which is consistent with the Standard Model prediction of 6. 6â 0.6+ 0.7 pb. The differential cross sections in bins of various kinematic variables are presented. 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.[Figure not available: see fulltext.]I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.