The exclusive Lambda(b)->Lambda l(+)l(-) decay with the fourth generation

Turan G.

JOURNAL OF HIGH ENERGY PHYSICS, no.5, 2005 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Publication Date: 2005
  • Journal Name: JOURNAL OF HIGH ENERGY PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Middle East Technical University Affiliated: Yes

Abstract

The exclusive Lambda(b)->Lambda l(+)l(-) decay is analyzed in the fourth generation model. We studied the sensitivity of the physical observables such as the branching ratio and the forward-backward asymmetry of this process to the model parameters, namely, the mass of the fourth generation up-type quark t' and the fourth generation CKM matrix element V-t's*V-t'b by using two possible solutions of the latter and the experimental results on branching ratios for B-s -> X-s gamma and Bs -> X(c)l nu overbar. It has been found that these observables are almost the same as the SM predictions when V-t's*V-t'b is positive. However, when it is negative, they are essentially very sensitive to the fourth generation model and can serve as efficient tools in search of the fourth generation.