Measurements of new physics in top quark decay at LHC

5th International Workshop on Top Quark Physics

Pagano, Davide^1

Université Catholique de Louvain, Belgium^1

关键词: Baryon number;    Flavor changing neutral currents;    Measurements of;    New physics;    Pp collisions;    Top quarks;    Upper limits;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/452/1/012011/pdf
DOI  :  10.1088/1742-6596/452/1/012011

来源: IOP

【 摘 要 】

A summary of ATLAS and CMS results on searches for new physics in top quark decay is presented. Three analysis are reported: the ATLAS and CMS searches for flavor changing neutral currents (FCNC) in top-quark decays and the CMS search for baryon number violation (BNV) in top-quark decays. ATLAS and CMS provided exclusion limits (at 95% CL) on the FCNC decay t → Zq, using respectively 2.1 fb-1and 5.0 fb-1of pp collisions at = 7 TeV collected in 2011. Upper limits on B(t → Zq) are respectively 0.73% and 0.24%. CMS has also set an exclusion limit (at 95% CL) on the BNV decay t → lbq using 5.0 fb-1of data. Upper limit on B(t → lbq) is 0.67%.