This Letter presents a search for pair production of heavy down-type quarks decaying via b??????Wt in the lepton+jets channel, as b???b?? ??????W-tW+t?? ???bb?? W+W-W+W-???l±??bb?? qq?? qq?? qq?? . In addition to requiring exactly one lepton, large missing transverse momentum, and at least six jets, the invariant mass of nearby jet pairs is used to identify high transverse momentum W bosons. In data corresponding to an integrated luminosity of 1.04??????fb-1 from pp collisions at ???s=7??????TeV recorded with the ATLAS detector, a heavy down-type quark with mass less than 480 GeV can be excluded at the 95% confidence level.
Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons / 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.109.032001]
Search for down-type fourth generation quarks with the ATLAS detector in events with one lepton and hadronically decaying W bosons
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
This Letter presents a search for pair production of heavy down-type quarks decaying via b??????Wt in the lepton+jets channel, as b???b?? ??????W-tW+t?? ???bb?? W+W-W+W-???l±??bb?? qq?? qq?? qq?? . In addition to requiring exactly one lepton, large missing transverse momentum, and at least six jets, the invariant mass of nearby jet pairs is used to identify high transverse momentum W bosons. In data corresponding to an integrated luminosity of 1.04??????fb-1 from pp collisions at ???s=7??????TeV recorded with the ATLAS detector, a heavy down-type quark with mass less than 480 GeV can be excluded at the 95% confidence level.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
