Study of FCNC mediated Z boson effect in the semileptonic rare baryonic decays $Λ_b \to Λl^+ l^- $

Details Study of FCNC mediated Z boson effect in the semileptonic rare baryonic decays $Λ_b \to Λl^+ l^- $ Study of FCNC mediated Z boson effect in the semileptonic rare baryonic decays $Λ_b \to Λl^+ l^- $

2005-10-13

arxiv.org/abs/hep-ph/0510171v1

Eur.Phys.J.C45:151-158,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 8 figures, to appear in EPJC

Scientific paper

10.1140/epjc/s2005-02407-6

We study the effect of the FCNC mediated $Z$ boson in the rare semileptonic baryonic decays $\Lambda_b \to \Lambda l^+ l^-$. We consider the model where the standard model fermion sector is extended by an extra vector like down quark, as a consequence of which it allows CP violating Z mediated flavor changing neutral current at the tree level. We find that due to this non-universal $Zbs $ coupling, branching ratios of the rare semileptonic $\Lambda_b$ decays are enhanced reasonably from their corresponding standard model values and the zero point of the forward backward asymmetry for $\Lambda_b \to \Lambda \mu^+ \mu^-$ is shifted to the left.

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