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Peer-reviewedCC BY 4.0Journal of High Energy Physics

The photon-energy spectrum in B → Xsγ to N3LO: light-fermion and large-Nc corrections

  • Matteo Fael1,2
  • Fabian Lange3,4
  • Kay Schönwald5
  • Matthias Steinhauser6
6 affiliations
  1. 1Dipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova
  2. 2Istituto Nazionale di Fisica Nucleare, Sezione di Padova
  3. 3Universität Zürich
  4. 4PSI Center for Neutron and Muon Sciences
  5. 5Theoretical Physics Department, CERN
  6. 6Karlsruhe Institute of Technology (KIT)
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Abstract

A bstract : We consider the photon-energy spectrum of the inclusive radiative decay B → X s γ , induced by the electromagnetic dipole operator O ₇ , to next-to-next-to-next-to-leading order and calculate the complete corrections for light fermions, for the contributions with two closed massive fermion loops, and for the limit of large QCD colour factors N c in the remaining part. We discuss the integrated decay rate both without and with a cut on the photon energy. In addition to the on-shell renormalization of the bottom-quark mass, we also consider the kinetic mass and the MSR mass schemes. The latter two lead to an improved perturbative behaviour of the decay rate.

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Cite

BibTeXRIS
BibTeX
@article{fael2026photonenergy,
  title = {{The photon-energy spectrum in B → Xsγ to N3LO: light-fermion and large-Nc corrections}},
  author = {Matteo Fael and Fabian Lange and Kay Schönwald and Matthias Steinhauser},
  journal = {Journal of High Energy Physics},
  year = {2026},
  month = oct,
  doi = {10.1007/jhep10(2026)114},
  url = {https://link.springer.com/article/10.1007/JHEP10(2026)114},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - The photon-energy spectrum in B → Xsγ to N3LO: light-fermion and large-Nc corrections
AU  - Matteo Fael
AU  - Fabian Lange
AU  - Kay Schönwald
AU  - Matthias Steinhauser
PY  - 2026
DA  - 2026/10/09
JO  - Journal of High Energy Physics
DO  - 10.1007/jhep10(2026)114
UR  - https://link.springer.com/article/10.1007/JHEP10(2026)114
AB  - A bstract : We consider the photon-energy spectrum of the inclusive radiative decay B → X s γ , induced by the electromagnetic dipole operator O ₇ , to next-to-next-to-next-to-leading order and calculate the complete corrections for light fermions, for the contributions with two closed massive fermion loops, and for the limit of large QCD colour factors N c in the remaining part. We discuss the integrated decay rate both without and with a cut on the photon energy. In addition to the on-shell renormalization of the bottom-quark mass, we also consider the kinetic mass and the MSR mass schemes. The latter two lead to an improved perturbative behaviour of the decay rate.
SN  - 1029-8479
ER  -