Nonperturbative O(m-2c) effects in B → Xsγ from heavy quark effective theory

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The nonperturbative contribution, suppressed by powers of the charm quark mass mc, in the inclusive decay B → Xsγ is analyzed in the context of heavy quark effective field theory (HQEFT). According to previous analyses, the leading effects of O(1/m2c) arise from an external gluon attached to a charm quark loop and can be expressed in terms of the chromomagnetic interaction of the b quark inside the B meson. This is also true at leading order in the HQEFT approach. However the structure of higher-dimensional operators is different because the effects of external gluons alone do not give a complete set of operators. A systematic method to derive all the high-dimensional operators can be obtained in the HQEFT scheme using the operator product expansion.

Original languageEnglish
Pages (from-to)165-170
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
Publication statusPublished - 1998 Oct 29


  • Heavy quark effective theory
  • Nonperturbative effects
  • Operator product expansion

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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