Measurements of four-lepton (4, =e,��) production cross sections at the Z resonance in pp collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant mass regions m+->5GeV and 80<m4<100GeV, the measured cross sections are 76��18(stat) ��4(syst)��1.4(lumi)fb and 107��9(stat)��4(syst) ��3.0(lumi)fb at s=7 and 8 TeV, respectively. By subtracting the nonresonant 4 production contributions and normalizing with Z�����+��- events, the branching fraction for the Z boson decay to 4 is determined to be (3.20��0.25(stat)��0.13(syst))��10-6, consistent with the standard model prediction. �� 2014 CERN, for the ATLAS Collaboration.
Measurements of four-lepton production at the Z resonance in pp collisions at s =7 and 8 TeV with ATLAS / Aad, G; Aloisio, Alberto; Alviggi, Mariagrazia; Canale, Vincenzo; Chiefari, Giovanni; DELLA VOLPE, Domenico; Merola, Leonardo; Conventi, Francesco; DELLA PIETRA, Massimo; Giordano, Raffaele; Rossi, Elvira; SANCHEZ PINEDA, ARTURO RODOLFO; Carlino, Gianpaolo; de Asmundis, Riccardo; Di Donato, Camilla; Doria, Alessandra; Iengo, Paolo; Izzo, Vincenzo; Sekhniaidze, Givi; Et, Al. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 112:231806(2014), pp. 1-18. [10.1103/PhysRevLett.112.231806]
Measurements of four-lepton production at the Z resonance in pp collisions at s =7 and 8 TeV with ATLAS
ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CANALE, VINCENZO;CHIEFARI, GIOVANNI;DELLA VOLPE, DOMENICO;MEROLA, LEONARDO;CONVENTI, FRANCESCO;DELLA PIETRA, MASSIMO;GIORDANO, RAFFAELE;Rossi, Elvira;SANCHEZ PINEDA, ARTURO RODOLFO;
2014
Abstract
Measurements of four-lepton (4, =e,��) production cross sections at the Z resonance in pp collisions at the LHC with the ATLAS detector are presented. For dilepton and four-lepton invariant mass regions m+->5GeV and 80I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
