Study on the rare radiative decay {ital B}{sub {ital c}}{r_arrow}{ital D}{sub {ital s}}{sup {asterisk}}{gamma} in the standard model and multiscale walking technicolor model
- Physics Department of Henan Normal University, Xinxiang, Henan, 453002, People`s Republic of (China)
Applying the perturbative QCD method, we study the decay {ital B}{sub {ital c}}{r_arrow}{ital D}{sub {ital s}}{sup {asterisk}}{gamma} in the standard model (SM) and multiscale walking technicolor model (MWTCM). In the SM, we find that the contribution of weak annihilation is more important than that of the electromagnetic penguin diagram. The presence of pseudo Goldstone bosons in the MWTCM leads to a large enhancement in the rate of {ital B}{sub {ital c}}{r_arrow}{ital D}{sub {ital s}}{sup {asterisk}}{gamma}, but this model is in conflict with the branching ratio of {ital Z}{r_arrow}{ital b{bar b}}({ital R}{sub {ital b}}) and the CLEO data on the branching ratio {ital B}({ital b}{r_arrow}{ital s}{gamma}). If top-color is further introduced, the calculated results in the top-color-assisted MWTCM can be suppressed and be in agreement with the CLEO data for a certain range of parameters. {copyright}{ital 1996 The American Physical Society.}
- OSTI ID:
- 388454
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 9 Vol. 54; ISSN 0556-2821; ISSN PRVDAQ
- Country of Publication:
- United States
- Language:
- English
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