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FIZIKA B 7 (1998) 2, 105-118
 
CONSTRAINT ON THE TRILINEAR GAUGE COUPLING BY THE
b ® sg DECAY CONSIDERING THE
POSSIBILITY OF THE FOURTH GENERATION OF QUARKS
Theoretical Physics Department, Indian Association for the
Cultivation of Science, Jadavpur, Calcutta 700032, India
Received 3 April 1998; Accepted 24 June 1998
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 ® sg 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 r 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.
PACS numbers: 12.60.-i
UDC 539.126
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