PreprintCC BY 4.0arXiv
Update of the Standard-Model prediction for B̅ → Xs γ
Abstract
We report on two recent calculations on the inclusive radiative decay B̅→ Xs γ, notably multi-parton contributions at NLO and the Q1,2−Q7 interference at NNLO for the physical value of the charm-quark mass. The former calculation formally completes B̅ → Xs γ at NLO in QCD at leading power, the latter removes a long-standing ± 3% uncertainty arising from interpolation in mc. The updated Standard-Model prediction for the CP- and isospin-averaged branching ratio reads ℬs γSM = (3.54 ± 0.14)× 10−4 for photon energies Eγ> 1.6 GeV in the B-meson rest frame. This value is in good agreement with the current experimental average ℬs γexp = (3.49 ± 0.19)× 10−4.
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BibTeX
@misc{huber2026update,
title = {{Update of the Standard-Model prediction for $\bar B \to X_s γ$}},
author = {Tobias Huber},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.01005},
eprint = {2609.01005},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.01005},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Update of the Standard-Model prediction for B̅ → X_s γ
AU - Tobias Huber
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.01005
UR - https://arxiv.org/abs/2609.01005
AB - We report on two recent calculations on the inclusive radiative decay B̅→ X_s γ, notably multi-parton contributions at NLO and the Q_1,2−Q_7 interference at NNLO for the physical value of the charm-quark mass. The former calculation formally completes B̅ → X_s γ at NLO in QCD at leading power, the latter removes a long-standing ± 3% uncertainty arising from interpolation in m_c. The updated Standard-Model prediction for the CP- and isospin-averaged branching ratio reads ℬ_s γ^SM = (3.54 ± 0.14)× 10^−4 for photon energies E_γ> 1.6 GeV in the B-meson rest frame. This value is in good agreement with the current experimental average ℬ_s γ^exp = (3.49 ± 0.19)× 10^−4.
ER -