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

Junegone Chay

doi:10.1016/S0370-2693(98)01011-9

Nonperturbative O(m^-2_c) effects in B → X_sγ from heavy quark effective theory

Junegone Chay

Department of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The nonperturbative contribution, suppressed by powers of the charm quark mass m_c, in the inclusive decay B → X_sγ 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 language	English
Pages (from-to)	165-170
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	439
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(98)01011-9
Publication status	Published - 1998 Oct 29

Keywords

Heavy quark effective theory
Nonperturbative effects
Operator product expansion

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/S0370-2693(98)01011-9

Cite this

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title = "Nonperturbative O(m-2c) 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/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.",

keywords = "Heavy quark effective theory, Nonperturbative effects, Operator product expansion",

author = "Junegone Chay",

note = "Funding Information: The author is grateful to Adam Falk, Seyong Kim, Pyungwon Ko, Soo-Jong Rey for helpful discussion. This work is supported in part by the Ministry of Education grants BSRI 97-2408, the Korea Science and Engineering Foundation (KOSEF) through the SRC program of SNU-CTP, the Distinguished Scholar Exchange Program of Korea Research Foundation and the German-Korean scientific exchange program DFG-446-KOR-113/72/0.",

year = "1998",

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doi = "10.1016/S0370-2693(98)01011-9",

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T1 - Nonperturbative O(m-2c) effects in B → Xsγ from heavy quark effective theory

AU - Chay, Junegone

N1 - Funding Information: The author is grateful to Adam Falk, Seyong Kim, Pyungwon Ko, Soo-Jong Rey for helpful discussion. This work is supported in part by the Ministry of Education grants BSRI 97-2408, the Korea Science and Engineering Foundation (KOSEF) through the SRC program of SNU-CTP, the Distinguished Scholar Exchange Program of Korea Research Foundation and the German-Korean scientific exchange program DFG-446-KOR-113/72/0.

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/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.

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/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.

KW - Heavy quark effective theory

KW - Nonperturbative effects

KW - Operator product expansion

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