PKU HEP Seminar and Workshop (北京大学高能物理组)
Inclusive radiative B meson decays: an update
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Asia/Shanghai
B105 (CHEP)
B105
CHEP
West Building, School of Physics, PKU
Description
The inclusive radiative decay of the B meson is known to provide strong constraints on new particles and their interactions. The current experimental world average for its branching ratio is (3.32 +- 0.15) * 10^-4 which agrees within one sigma with the recently updated SM prediction (3.36 +- 0.23) * 10^-4. Some of the NNLO QCD corrections are included with the help of interpolation in the charm quark mass, which causes about 3 percent uncertainty in present SM prediction. Efforts towards removing this uncertainty are the main topic of my talk. I will present the counterterm contributions to the dominant charm quark mass dependent NNLO correction, for an arbitrary value of the m_c/m_b quark mass ratio. Next, I will talk about our work in progress on bare NNLO QCD corrections for arbitrary above quark mass ratio. Such contributions are amount to evaluate two scale four-loop propagator diagrams with unitarity cuts.