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

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Abstract

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/m2 c) 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
Volume439
Issue number1-2
Publication statusPublished - 1998 Oct 29

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quarks
operators
gluons
mesons
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decay
products
interactions

Keywords

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

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title = "Nonperturbative O(m-2 c) effects in B → Xsγ from heavy quark effective theory",
abstract = "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/m2 c) 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.",
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T1 - Nonperturbative O(m-2 c) effects in B → Xsγ from heavy quark effective theory

AU - Chay, Junegone

PY - 1998/10/29

Y1 - 1998/10/29

N2 - 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/m2 c) 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.

AB - 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/m2 c) 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.

KW - Heavy quark effective theory

KW - Nonperturbative effects

KW - Operator product expansion

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VL - 439

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

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