A search is reported for the pair production of a new quark b??? with at least one b??? decaying to a Z boson and a bottom quark. The data, corresponding to 2.0??????fb-1 of integrated luminosity, were collected from pp collisions at ???s=7??????TeV with the ATLAS detector at the CERN Large Hadron Collider. Using events with a b-tagged jet and a Z boson reconstructed from opposite-charge electrons, the mass distribution of large transverse momentum b??? candidates is tested for an enhancement. No evidence for a b??? signal is detected in the observed mass distribution, resulting in the exclusion at a 95% confidence level of b??? quarks with masses mb???<400??????GeV that decay entirely via b??????Z+b. In the case of a vectorlike singlet b??? mixing solely with the third standard model generation, masses mb???<358??????GeV are excluded.
Search for pair production of a new b??? quark that decays into a Z boson and a bottom quark 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: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 109:(2012), pp. 1-19. [10.1103/PhysRevLett.109.071801]
Search for pair production of a new b??? quark that decays into a Z boson and a bottom quark 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;
2012
Abstract
A search is reported for the pair production of a new quark b??? with at least one b??? decaying to a Z boson and a bottom quark. The data, corresponding to 2.0??????fb-1 of integrated luminosity, were collected from pp collisions at ???s=7??????TeV with the ATLAS detector at the CERN Large Hadron Collider. Using events with a b-tagged jet and a Z boson reconstructed from opposite-charge electrons, the mass distribution of large transverse momentum b??? candidates is tested for an enhancement. No evidence for a b??? signal is detected in the observed mass distribution, resulting in the exclusion at a 95% confidence level of b??? quarks with masses mb???<400??????GeV that decay entirely via b??????Z+b. In the case of a vectorlike singlet b??? mixing solely with the third standard model generation, masses mb???<358??????GeV are excluded.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
