Abstract
We consider two-loop QCD corrections to the element \( {\Gamma}_{12}^q \) of the decay matrix in Bq − \( {\overline{B}}_q \) 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 ∆Γs matching the precise experimental data. We present compact analytic results for all matching coefficients in an expansion in mc/mb up to second order. Our new corrections are comparable in size to the current experimental error and slightly increase ∆Γs.
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Gerlach, M., Nierste, U., Shtabovenko, V. et al. Two-loop QCD penguin contribution to the width difference in Bs − \( {\overline{B}}_s \) mixing. J. High Energ. Phys. 2021, 43 (2021). https://doi.org/10.1007/JHEP07(2021)043
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DOI: https://doi.org/10.1007/JHEP07(2021)043