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Two-loop QCD penguin contribution to the width difference in B s − B ¯ s B̅_(s) mixing
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Two-loop QCD penguin contribution to the width difference in B s − B ¯ s B̅_(s) mixing
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Journal Article
Two-loop QCD penguin contribution to the width difference in B s − B ¯ s B̅_(s) mixing
2021
Overview
Abstract We consider two-loop QCD corrections to the element Γ 12 q Γ₁₂^(q) of the decay matrix in B q − B ¯ q B̅_(q) mixing, q = d, s, in the leading power of the Heavy Quark Expansion. The calculated contributions involve one current-current and one penguin operator and constitute the next step towards a theory prediction for the width difference ∆Γ s matching the precise experimental data. We present compact analytic results for all matching coefficients in an expansion in m c /m b up to second order. Our new corrections are comparable in size to the current experimental error and slightly increase ∆Γ s .
Publisher
SpringerOpen
Subject
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