Abstract
We compute three-loop vertex corrections to b → sγ induced by current-current operators. The results are presented as expansions in mc/mb with numerical coefficients which allow to cover all relevant values for the heavy quark masses in different renormalization schemes. Moreover we provide for the first time analytic results for the next-to-leading order contribution. Our results present an important building block to the next-to-next-to-leading order interference contributions of the current-current operators Q1 and Q2 with the electric dipole operator Q7.
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Acknowledgments
We thank Mikolaj Misiak for useful comments to the manuscript. This research was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under grant 396021762 — TRR 257 “Particle Physics Phenomenology after the Higgs Discovery” and has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme grant agreement 101019620 (ERC Advanced Grant TOPUP). The work of M.F. was supported by the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 101065445 — PHOBIDE. We have used the program FeynGame [85] to draw the Feynman diagrams.
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Fael, M., Lange, F., Schönwald, K. et al. Three-loop b → sγ vertex with current-current operators. J. High Energ. Phys. 2023, 166 (2023). https://doi.org/10.1007/JHEP11(2023)166
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DOI: https://doi.org/10.1007/JHEP11(2023)166