NNLO fermionic corrections to the charm quark mass dependent matrix elements in B̄ → Xsγ

Radja Boughezal*, Micha Czakon, Thomas Schutzmeier

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

We compute the virtual (αs2) fermionic contributions to the charm quark mass dependent matrix elements of the X sγ decay. In the case of a massless quark loop insertion into the gluon propagator, our result obtained as an expansion in z ≤ m c2/mb2 and an exact expression in terms of multi-fold MB integrals, confirms the findings of Bieri, Greub and Steinhauser [22]. In the case of a b-quark loop insertion, we observe large differences between the actual massive case and the massless approximation. These turn out, as expected, to be less pronounced for the charm quark.

Original languageEnglish (US)
Article number072
JournalJournal of High Energy Physics
Volume2007
Issue number9
DOIs
StatePublished - Sep 1 2007

Keywords

  • B-physics
  • QCD
  • Rare decays

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint

Dive into the research topics of 'NNLO fermionic corrections to the charm quark mass dependent matrix elements in B̄ → Xsγ'. Together they form a unique fingerprint.

Cite this