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Effects of a fourth family on b→sγ and a useful parametrization of quark mixing for rare B decays

1987; Elsevier BV; Volume: 192; Issue: 3-4 Linguagem: Inglês

10.1016/0370-2693(87)90135-3

1873-2445

W.-S. Hou, A. Soni, H. Steger,

High-Energy Particle Collisions Research

The effects of a fourth family on the decays b→s(d)γ are reported. The BR(b→sγ) can become ∼10−3, i.e., a gain from the three-generation result by an order of magnitude. For very massive t′ (mt > 200GeV) the four-generation result is not sensitive to mt, making the reaction usuful for probing the new mixing angles of the fourth generation. We emphasize that combined information from b→sγ, sℓ+ℓ− and the hadronic b→s transition without charmed particles would be useful for constraining mass scales and mixing parameters of a fourth generation. In view of the importance of B decays we present a new parametrization of the 4×4 mixing matrix that appears to be better suited for the study of B physics.