The inclusive B̅ → Xs γ decay rate with higher precision
Abstract
We present a new and upgraded analysis of the inclusive weak radiative decay of the B meson in the standard model and beyond. The 𝒪(αs) perturbative corrections are included in a formally complete manner. At the order αs2, exact dependence on the charm quark mass is calculated for the dominant corrections, which removes a sizeable uncertainty that was present in all the previous analyses. The global normalization factor and many of the non-perturbative contributions are expressed in terms of the kinetic-scheme mass of the b-quark and the heavy-quark-expansion matrix elements. These parameters are adopted from the most recent semileptonic fits that include 𝒪(αs3) corrections and up-to-date experimental results. We find ℬsγSM = (3.54 ± 0.14)× 10−4 for the CP- and isospin-averaged branching ratio of the considered decay in the standard model, with a lower cut on the photon energy Eγ> 1.6 GeV. It agrees with the current experimental average ℬsγexp = (3.49 ± 0.19)× 10−4, which provides constraints on beyond standard model physics. In particular, we find MH± > 670 GeV at 95% C.L. for the charged Higgs boson mass in the two-Higgs-doublet model~II.
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BibTeX
@misc{misiak2026inclusive,
title = {{The inclusive $\bar B \to X_s γ$ decay rate with higher precision}},
author = {M. Misiak and H. M. Asatrian and K. Brune and M. Czaja and M. Czakon and M. Fael and C. Greub and T. Huber and F. Lange and L. T. Moos and M. Niggetiedt and A. Rehman and K. Schönwald and M. Steinhauser},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.29863},
eprint = {2608.29863},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.29863},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - The inclusive B̅ → X_s γ decay rate with higher precision
AU - M. Misiak
AU - H. M. Asatrian
AU - K. Brune
AU - M. Czaja
AU - M. Czakon
AU - M. Fael
AU - C. Greub
AU - T. Huber
AU - F. Lange
AU - L. T. Moos
AU - M. Niggetiedt
AU - A. Rehman
AU - K. Schönwald
AU - M. Steinhauser
PY - 2026
DA - 2026/08/30
PB - arXiv
DO - 10.48550/arxiv.2608.29863
UR - https://arxiv.org/abs/2608.29863
AB - We present a new and upgraded analysis of the inclusive weak radiative decay of the B meson in the standard model and beyond. The 𝒪(α_s) perturbative corrections are included in a formally complete manner. At the order α_s^2, exact dependence on the charm quark mass is calculated for the dominant corrections, which removes a sizeable uncertainty that was present in all the previous analyses. The global normalization factor and many of the non-perturbative contributions are expressed in terms of the kinetic-scheme mass of the b-quark and the heavy-quark-expansion matrix elements. These parameters are adopted from the most recent semileptonic fits that include 𝒪(α_s^3) corrections and up-to-date experimental results. We find ℬ_sγ^SM = (3.54 ± 0.14)× 10^−4 for the CP- and isospin-averaged branching ratio of the considered decay in the standard model, with a lower cut on the photon energy E_γ> 1.6 GeV. It agrees with the current experimental average ℬ_sγ^exp = (3.49 ± 0.19)× 10^−4, which provides constraints on beyond standard model physics. In particular, we find M_H^± > 670 GeV at 95% C.L. for the charged Higgs boson mass in the two-Higgs-doublet model~II.
ER -