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, A., Alviggi, M., Canale, V., Cevenini, F., Chiefari, G., DELLA VOLPE, D., Merola, L., Patricelli, S., Conventi, F., DELLA PIETRA, M., Giordano, R., Musto, E., Rossi, E., SANCHEZ PINEDA, A.R., Carlino, G., de Asmundis, R., Di Donato, C., Doria, A., Iengo, P., et al.. - 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.
