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arXiv · 2512.08902

Update of the nonlocal sub-leading ${O}_1$-${O}_7$ contribution to $\bar B \to X_s γ$ at LO

Michael Benzke·Maria Vittoria Garzelli·Tobias Hurth
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Abstract

In all previous calculations of the non-local sub-leading contribution to the inclusive penguin decay $\bar B \to X_s γ$ due to the interference of the electroweak operators ${O}_1^c$ - ${O}_{7γ}$ the local Voloshin term was subtracted. In view of the ongoing analysis at order $α_s$, we present a calculation of the complete non-local contribution which takes into account the high correlation between the uncertainties of the local Voloshin and the non-local term of the previous analyses. The new calculation has a high impact on the range of the non-local contribution.

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Michael Benzke, Maria Vittoria Garzelli, Tobias Hurth. 2026-03-05. Update of the nonlocal sub-leading ${O}_1$-${O}_7$ contribution to $\bar B \to X_s γ$ at LO. https://doi.org/10.1103/g6ds-ldx4

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