2011/07/28 by Ishtiaq Ahmed, M. Ali Paracha, Ahmed, Ishtiaq +9
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.1107.5694
openalex publication_date 2011/07/28 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
The weak decays of Bc --> Ds*l+l- (l=mu,tau) are investigated in the Standard Model with fourth generation (SM4). Taking fourth generation quark mass mt' of about 300 to 600 GeV with the CKM matrix elements Vt'b*Vt's in the range (0.03-1.2)*10-2 and using the new CP odd phase (phisb) to be 90o the analysis of decay rates, forward-backward asymmetries, lepton polarization asymmetries and the helicity fractions of Ds* meson in Bc --> Ds*l+l- (l=mu,tau) is made. It is shown that the values of these physical observables are greatly influenced by the effects of extra sequential quark generation in the SM. It is found that the zero position of the forward-backward asymmetry in Bc --> Ds* mu+ mu- deviates significantly from that of the SM value while the effects in the decay rate, helicity fractions of Ds* meson and the lepton polarization asymmetries are also quite promising. In Bc --> Ds* tau+ tau- decay, the SM4 the NP effects are somewhat mild in the decay rate and forward-backward asymmetry but they have shown them up in the longitudinal and transverse lepton polarization and also in the helicity fractions of the Ds* meson which differ distinctively from the SM values. Thus the study of these physical observables will provide us useful information to probe new physics and helps us to search for the fourth generation of quarks (t',b') in an indirect way.