Abstract
We provide a systematic treatment of the previously discovered power- enhanced QED corrections to the leptonic decay Bq→ μ+μ− (q = d, s) in the frame- work of soft-collinear effective theory (SCET). Employing two-step matching on SCETI and SCETII, and the respective renormalization group equations, we sum the leading- logarithmic QED corrections and the mixed QED-QCD corrections to all orders in the couplings for the matrix element of the semileptonic weak effective operator Q9. We pro- pose a treatment of the B-meson decay constant and light-cone distribution amplitude in the presence of process-specific QED corrections. Finally we include ultrasoft photon radiation and provide updated values of the non-radiative and radiative branching fractions of Bq→ μ+μ− decay that include the double-logarithmic QED and QCD corrections.
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16 November 2022
An Erratum to this paper has been published: https://doi.org/10.1007/JHEP11(2022)099
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Beneke, M., Bobeth, C. & Szafron, R. Power-enhanced leading-logarithmic QED corrections to Bq→ μ+μ−. J. High Energ. Phys. 2019, 232 (2019). https://doi.org/10.1007/JHEP10(2019)232
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DOI: https://doi.org/10.1007/JHEP10(2019)232