A search for pair-produced heavy vectorlike charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14  fb-1, the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T→tZ, a T quark with a mass less than 475  GeV/c2 is excluded at the 95% confidence level.

S. CHATRCHYAN, V. KHACHATRYAN, A.M. SIRUNYAN, A. TUMASYAN, W. ADAM, T. BERGAUER, et al. (2011). Search for a Vectorlike Quark with Charge 2/3 in t + Z Events from pp Collisions at sqrt(s)=7 TeV. PHYSICAL REVIEW LETTERS, 107, 271802-1-271802-15 [10.1103/PhysRevLett.107.271802].

Search for a Vectorlike Quark with Charge 2/3 in t + Z Events from pp Collisions at sqrt(s)=7 TeV

BONACORSI, DANIELE;BRAIBANT, SYLVIE;BRIGLIADORI, LUCA;CAPILUPPI, PAOLO;CASTRO, ANDREA;CUFFIANI, MARCO;FANFANI, ALESSANDRA;FASANELLA, DANIELE;MENEGHELLI, MARCO;NAVARRIA, FRANCESCO LUIGI;PRIMAVERA, FEDERICA;ROVELLI, TIZIANO;SIROLI, GIAN PIERO;C. BATTILANA;GUIDUCCI, LUIGI;
2011

Abstract

A search for pair-produced heavy vectorlike charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14  fb-1, the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T→tZ, a T quark with a mass less than 475  GeV/c2 is excluded at the 95% confidence level.
2011
S. CHATRCHYAN, V. KHACHATRYAN, A.M. SIRUNYAN, A. TUMASYAN, W. ADAM, T. BERGAUER, et al. (2011). Search for a Vectorlike Quark with Charge 2/3 in t + Z Events from pp Collisions at sqrt(s)=7 TeV. PHYSICAL REVIEW LETTERS, 107, 271802-1-271802-15 [10.1103/PhysRevLett.107.271802].
S. CHATRCHYAN; V. KHACHATRYAN; A.M. SIRUNYAN; A. TUMASYAN; W. ADAM; T. BERGAUER; M. DRAGICEVIC; J. ER N(O; C. FABJAN; M. FRIEDL; R. FRUHWIRTH; V.M. GH...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/118042
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