Implications of the non-universal Z boson in FCNC mediated rare decays

Details Implications of the non-universal Z boson in FCNC mediated rare decays Implications of the non-universal Z boson in FCNC mediated rare decays

2005-03-23

arxiv.org/abs/hep-ph/0503225v2

Phys.Rev. D71 (2005) 114013

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures, minor changes in the text, references added, to appear in PRD

Scientific paper

10.1103/PhysRevD.71.114013

We analyze the effect of the non-universal $Z$ boson in the rare decays $B_s \to l^+ l^- $, $B_s \to l^+ l^- \gamma $ and $Z \to b \bar s$ decays. These decays involve the FCNC mediated $ b \to s $ transitions, and are found to be very small in the standard model. The smallness of these decays in the standard model makes them sensitive probe for new physics. We find an enhancement of at least an order in these branching ratios because of the non-universal $Zbs$ coupling.

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