Flavor changing Z-decays from scalar interactions at a Giga-Z Linear Collider

Details Flavor changing Z-decays from scalar interactions at a Giga-Z Linear Collider Flavor changing Z-decays from scalar interactions at a Giga-Z Linear Collider

2002-03-20

arxiv.org/abs/hep-ph/0203200v2

Phys.Rev.D66:093005,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 15 figures, REVTeX4. A new section added and a few minor corrections were made in the text

Scientific paper

10.1103/PhysRevD.66.093005

The flavor changing decay Z -> d_I \bar{d}_J is investigated with special emphasis on the b \bar{s} final state. Various models for flavor violation are considered: two Higgs doublet models (2HDM's), supersymmetry (SUSY) with flavor violation in the up and down-type squark mass matrices and SUSY with flavor violation mediated by R-parity-violating interaction. We find that, within the SUSY scenarios for flavor violation, the branching ratio for the decay Z -> b \bar{s} can reach 10^{-6} for large \tan\beta values, while the typical size for this branching ratio in the 2HDM's considered is about two orders of magnitudes smaller at best. Thus, flavor changing SUSY signatures in radiative Z decays such as Z -> b \bar{s} may be accessible to future ``Z factories'' such as a Giga-Z version of the TESLA design.

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