Results are presented from a search for the production of a heavy gauge boson Wâ² decaying into a top and a bottom quark, using a data set collected by the CMS experiment at âs = 8TeV and corresponding to an integrated luminosity of 19.5 fbâ1. Various models of Wâ²-boson production are studied by allowing for an arbitrary combination of left-and right-handed couplings. The analysis is based on the detection of events with a lepton (e, μ), jets, and missing transverse energy in the final state. No evidence for Wâ²-boson production is found and 95% confidence level upper limits on the production cross section times branching fraction are obtained. For Wâ² bosons with purely right-handed couplings, and for those with left-handed couplings assuming no interference effects, the observed 95% confidence level limit is M(Wâ²) > 2.05TeV. For Wâ² bosons with purely left handed couplings, including interference effects, the observed 95% confidence level limit is M(Wâ²) > 1.84TeV. The results presented in this paper are the most stringent limits published to date.
Search for Wâ²âtb decays in the lepton + jets final state in pp collisions at âs = 8TeV
ALBERGO, Sebastiano Francesco;CAPPELLO, GIGI;CHIORBOLI, MASSIMILIANO;COSTA, Salvatore;GIORDANO, FERDINANDO;POTENZA, Renato Carlo;TRICOMI, Alessia Rita;TUVE', Cristina Natalina;
2014-01-01
Abstract
Results are presented from a search for the production of a heavy gauge boson Wâ² decaying into a top and a bottom quark, using a data set collected by the CMS experiment at âs = 8TeV and corresponding to an integrated luminosity of 19.5 fbâ1. Various models of Wâ²-boson production are studied by allowing for an arbitrary combination of left-and right-handed couplings. The analysis is based on the detection of events with a lepton (e, μ), jets, and missing transverse energy in the final state. No evidence for Wâ²-boson production is found and 95% confidence level upper limits on the production cross section times branching fraction are obtained. For Wâ² bosons with purely right-handed couplings, and for those with left-handed couplings assuming no interference effects, the observed 95% confidence level limit is M(Wâ²) > 2.05TeV. For Wâ² bosons with purely left handed couplings, including interference effects, the observed 95% confidence level limit is M(Wâ²) > 1.84TeV. The results presented in this paper are the most stringent limits published to date.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.