This paper presents a search for a new heavy particle produced in association with a top or antitop quark. Two models in which the new heavy particle is a color singlet or a color triplet are considered, decaying, respectively, to tq or tq, leading to a resonance within the tt þ jets signature. The full 2011 ATLAS pp collision data set from the LHC (4:7 fb1) is used to search for tt events produced in association with jets, in which one of the W bosons from the top quarks decays leptonically and the other decays hadronically. The data are consistent with the Standard Model expectation, and a new particle with mass below 430 Gev for both W0 boson and color triplet models is excluded at 95% confidence level, assuming unit right-handed coupling.
Search for resonant top quark plus jet production in tt[over ¯]+jets events with the ATLAS detector in pp collisions at √s=7 TeV
CONTA, CLAUDIO;FRANCHINO, SILVIA;FRATERNALI, MARCO;LIVAN, MICHELE;NEGRI, ANDREA;REBUZZI, DANIELA MARCELLA;RIMOLDI, ADELE;USLENGHI, MASSIMILIANO;
2012-01-01
Abstract
This paper presents a search for a new heavy particle produced in association with a top or antitop quark. Two models in which the new heavy particle is a color singlet or a color triplet are considered, decaying, respectively, to tq or tq, leading to a resonance within the tt þ jets signature. The full 2011 ATLAS pp collision data set from the LHC (4:7 fb1) is used to search for tt events produced in association with jets, in which one of the W bosons from the top quarks decays leptonically and the other decays hadronically. The data are consistent with the Standard Model expectation, and a new particle with mass below 430 Gev for both W0 boson and color triplet models is excluded at 95% confidence level, assuming unit right-handed coupling.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
