The decay b -> s g at NLL in the Standard Model

Details The decay b -> s g at NLL in the Standard Model The decay b -> s g at NLL in the Standard Model

2000-11-07

arxiv.org/abs/hep-ph/0011093v1

J.Phys.G27:1193-1198,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages including 5 postscript figures; uses epsfig

Scientific paper

10.1088/0954-3899/27/6/315

I present the Standard Model calculation of the decay rate for b -> s g (g denotes a gluon) at next-to-leading logarithms (NLL). In order to get a meaningful physical result, the decay b -> s g g and certain contributions of b -> s \bar{f} f (where f are the light quark flavours u, d and s) have to be included as well. Numerically we get BR^(NLL) = (5.0 +/- 1.0) * 10^{-3} which is more than a factor 2 larger than the leading logarithmic result BR^(LL) = (2.2 +/- 0.8) * 10^{-3}. Further, I consider the impact of this contribution on the charmless hadronic branching ratio BRc, which could be used to extract the CKM-ratio |V_(ub)/V_(cb)| with more accuracy. Finally, I have a short look at BRc in scenarios where the Wilson coefficient C_8 is enhanced by new physics.

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