par Chatrchyan, Serguei;Charaf, Othman 
;Clerbaux, Barbara ;Gay, Arnaud ;Hammad, Grégory ;Hreus, Tomas ;Marage, Pierre ;Raval, Amita ;Thomas, Anne-Laure ;Vander Velde, Catherine ;Vanlaer, Pascal ; [et al.]
Référence Physical review letters, 107, 27, 271802
Publication Publié, 2011
;Clerbaux, Barbara ;Gay, Arnaud ;Hammad, Grégory ;Hreus, Tomas ;Marage, Pierre ;Raval, Amita ;Thomas, Anne-Laure ;Vander Velde, Catherine ;Vanlaer, Pascal ; [et al.]Référence Physical review letters, 107, 27, 271802
Publication Publié, 2011
Article révisé par les pairs
| Résumé : | 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 1.14fb -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 475GeV/c 2 is excluded at the 95% confidence level. |
