Precision Global Determination of the B→Xsγ Decay Rate
Name
PhysRevLett.127.102001.pdf
Description
Published version
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636.38 KB
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Checksum (MD5)
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Author(s)
Bernlochner, Florian U
Lacker, Heiko
Ligeti, Zoltan
Stewart, Iain W
Tackmann, Frank J
Tackmann, Kerstin
Date Issued
2021
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Bernlochner, Florian U, Lacker, Heiko, Ligeti, Zoltan, Stewart, Iain W, Tackmann, Frank J et al. 2021. "Precision Global Determination of the B→Xsγ Decay Rate." Physical Review Letters, 127 (10).
Version
Final published version
Abstract
We perform the first global fit to inclusive B→X_{s}γ measurements using a model-independent treatment of the nonperturbative b-quark distribution function, with next-to-next-to-leading logarithmic resummation and O(α_{s}^{2}) fixed-order contributions. The normalization of the B→X_{s}γ decay rate, given by |C_{7}^{incl}V_{tb}V_{ts}^{*}|^{2}, is sensitive to physics beyond the standard model (SM). We determine |C_{7}^{incl}V_{tb}V_{ts}^{*}|=(14.77±0.51_{fit}±0.59_{theory}±0.08_{param})×10^{-3}, in good agreement with the SM prediction, and the b-quark mass m_{b}^{1S}=(4.750±0.027_{fit}±0.033_{theory}±0.003_{param}) GeV. Our results suggest that the uncertainties in the extracted B→X_{s}γ rate have been underestimated by up to a factor of 2, leaving more room for beyond-SM contributions.
MIT Department
Massachusetts Institute of Technology. Center for Theoretical Physics
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.127.102001
