Original scientific paper
Constraint on the trilinear gauge coupling by the b → sγ decay considering the possibility of the fourth generation of quarks
Surath Kumar Biswas
; Theoretical Physics Department, Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700032, India
V. P. Gautam
; Theoretical Physics Department, Indian Association for the Cultivation of Science, Jadavpur, Calcutta 700032, India
Abstract
We examine the indirect effect of the new physics. The virtual effects of the trilinear gauge coupling of the photon to W+W- on the b → sγ decay has been tested considering the possibility of the fourth generation in the quark sector, with corrections up to leading QCD logarithmas, using evolution of the fourth-generation CKM matrix with CP-violation phase equal to zero. Range of mass of the fourth-generation down-type quark b˘ and that of fourth generation up-type quark t˘ have been taken with due observance of the constraint imposed by the present experimental value of the ρ parameter, keeping in view the mass difference of the fourth-generation quark doublet. Strong-interaction coupling constant, however, is taken on matching scale of Z-boson mass.
Keywords
Hrčak ID:
303817
URI
Publication date:
1.4.1998.
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