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Precision Global Determination of the B→Xsγ Decay Rate

Author(s)
Bernlochner, Florian U; Lacker, Heiko; Ligeti, Zoltan; Stewart, Iain W; Tackmann, Frank J; Tackmann, Kerstin; ... Show more Show less
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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.
Date issued
2021
URI
https://hdl.handle.net/1721.1/142229
Department
Massachusetts Institute of Technology. Center for Theoretical Physics
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

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