TY - JOUR
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
UR - http://www.scopus.com/inward/record.url?scp=0347024585&partnerID=8YFLogxK
U2 - 10.1016/S0370-2693(98)01011-9
DO - 10.1016/S0370-2693(98)01011-9
M3 - Article
AN - SCOPUS:0347024585
SN - 0370-2693
VL - 439
SP - 165
EP - 170
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -