Isospin Symmetry Breaking in B->K^* γDecay due to an Extra Generation of Vector Quarks

Details Isospin Symmetry Breaking in B->K^* γDecay due to an Extra Generation of Vector Quarks Isospin Symmetry Breaking in B->K^* γDecay due to an Extra Generation of Vector Quarks

2005-08-09

arxiv.org/abs/hep-ph/0508105v1

Int.J.Mod.Phys. A20 (2005) 6229-6240

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 8 figures, To appear in the proceedings of the MRST 2005 conference

Scientific paper

10.1142/S0217751X05029253

The extra contributions due to an extra generation of vector-like quarks to the isospin symmetry breaking observable associated with the radiative B->K^* \gamma decay is obtained. It is shown that this additional contribution is sensitive to the nonunitarity parameter U^{sb}, which is a measure of the the strength of the non-zero tree-level flavor changing neutral current in this model. The significance of this result is that, once accurate experimental resultson the isospin asymmetry becomes available, one can constrain the U^{sb} independent of the mass of the extra quarks and so a much more stringent acceptablemodel parameter space could be obtained.

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