Izvorni znanstveni članak
Study of radiative B decay considering two-Higgs-doublet models and the fourth generation in quark sector
Haraprasad Roy
; Theoretical Physics Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, Indi
Surath Kumar Biswas
; Theoretical Physics Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, Indi
Vinod P. Gautam
; Theoretical Physics Department, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, Indi
Sažetak
Considering the nonstandard indirect effect of Yukawa couplings of the Higgs doublet to the quarks, we examine strong-interaction effects in weak radiative B-meson decay. The virtual effects of the Model I and Model II in the penguin-type diagram on the b → sγ decay have been tested considering the possibility of the fourth generation in quark sector, with corrections up to the leading QCD logarithms, using evolution of the fourth-generation CKM matrix, with CP violation phase equal to zero. Range of the masses of the fourth-generation down-type quark b0 and up-type quark t 0 have been taken with due consideration 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. As a by-product, it is observed that the CLEO bound clearly sets the lower bound on the Higgs boson mass at 220 GeV, which is above the top quark mass.
Ključne riječi
weak radiative B-meson decay; fourth generation; Higgs boson mass
Hrčak ID:
304071
URI
Datum izdavanja:
2.5.2002.
Posjeta: 126 *