FIZIKA B 7 (1998) 2, 105-118

size 221 kBsize 229 kB

CONSTRAINT ON THE TRILINEAR GAUGE COUPLING BY THE
b sg DECAY CONSIDERING THE POSSIBILITY OF THE FOURTH GENERATION OF QUARKS

SURATH KUMAR BISWAS and V. P. GAUTAM1
1e-mail: tpvpg@iacs.ernet.in

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

 

Copyright by The Croatian Physical Society
For problems or questions please contact fizika@fizika.hfd.hr