SCHEME INDEPENDENCE OF THE EFFECTIVE HAMILTONIAN FOR B-]S-GAMMA AND B-]SG DECAYS

Citation
M. Ciuchini et al., SCHEME INDEPENDENCE OF THE EFFECTIVE HAMILTONIAN FOR B-]S-GAMMA AND B-]SG DECAYS, Physics letters. Section B, 316(1), 1993, pp. 127-136
Citations number
25
Categorie Soggetti
Physics
Journal title
ISSN journal
03702693
Volume
316
Issue
1
Year of publication
1993
Pages
127 - 136
Database
ISI
SICI code
0370-2693(1993)316:1<127:SIOTEH>2.0.ZU;2-B
Abstract
We present a calculation of the effective weak Hamiltonian which gover ns b --> sgamma and b --> sg transitions in two different renormalizat ion schemes (NDR and HV). In the leading logarithmic approximation, we show that the coefficients of the effective Hamiltonian are scheme in dependent only when one takes correctly into account the scheme depend ence of one- and two- loop diagrams. We demonstrate that in NDR there are contributions which were missed in previous calculations. These co ntributions are necessary to obtain scheme independent coefficients in the final results.