Fourth generation effects in rare $B_s \rightarrow \ell^+ \ell^-$ and $B_s \rightarrow \ell^+ \ell^- \gamma$ decays

T.M. Aliev; A. Özpineci; M. Savcı

doi:doi:10.1140/epjc/s2002-01110-6

EPJ

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2022 Impact factor 4.4

Particles and Fields

Eur. Phys. J. C 27, 405-410 (2003)
DOI: 10.1140/epjc/s2002-01110-6

Fourth generation effects in rare $B_s \rightarrow \ell^+ \ell^-$ and $B_s \rightarrow \ell^+ \ell^- \gamma$ decays

T.M. Aliev, A. Özpineci and M. Savci

Physics Department, Middle East Technical University, 06531 Ankara, Turkey

(Received: 31 July 2002 / Revised version: 12 November 2002 / Published online: 19 February 2003 )

Abstract
The contribution of the fourth generation quarks to the rare $B_s \rightarrow \ell^+ \ell^-$ and $B_s \rightarrow \ell^+ \ell^- \gamma$ decays are studied. Constraints on the extended Cabibbo-Kobayashi-Maskawa matrix elements $\left\vert V_{tb} V_{ts}^\ast \right\vert$ and $\left\vert V_{t^\prime b} V_{t^\prime s}^\ast \right\vert$ are obtained from the existing experimental result for the branching ratio of the $B \rightarrow X_s \gamma$ decay. The branching ratios of the above-mentioned decays, as well as the photon spectrum in the $B_s \rightarrow \ell^+ \ell^- \gamma$ decay, are studied. It is found that the results are sensitive to the existence of the fourth generation.