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.
|Number of pages
|Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
|Published - 1998 Oct 29
Bibliographical noteFunding 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.
- Heavy quark effective theory
- Nonperturbative effects
- Operator product expansion
ASJC Scopus subject areas
- Nuclear and High Energy Physics