2008/07/29 by K. Zeynali, V. Bashiry
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.78.033001
published as Phys.Rev.D78:033001,2008 · 17 pages, 7 figures
arxiv created 2008/07/29 · openalex publication_date 2008/08/05 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We investigate the influence of the fourth generation of quarks on the branching ratio, the CP asymmetry, and the polarization asymmetries in B\ensuremath→\ensuremathρ\ensuremathℓ+\ensuremathℓ^\ensuremath- decay. Taking |V_t^\ensuremath'dV_t^\ensuremath'b|\ensuremath∼0.001 with phase about 10\ifmmode^∘\else\textdegree\fi, which is consistent with the sin2\ensuremathφ1 of the Cabibbo-Kobayashi-Maskawa matrix and the Bd mixing parameter \ensuremathΔm_Bd, we obtain that for both (\ensuremathμ,\ensuremathτ) channels the branching ratio is increased and the magnitude of CP asymmetry and polarization asymmetries decreased by the mass and mixing parameters of the 4th generation of quarks. These results can serve as a good tool to search for new physics effects, precisely, to search for the fourth generation of quarks (t^\ensuremath',b^\ensuremath') via its indirect manifestations in loop diagrams.