1999/04/01 by Rukmani Mohanta, A K Giri, Anjan K. Giri +6 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1143/ptp.101.959
published as Prog.Theor.Phys.101:959-969,1999 · 10 pages, uses ptptex.sty
openalex publication_date 1999/04/01 · arxiv created 1999/04/14 · arxiv updated 2011/03/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Cabibbo allowed two-body hadronic weak decays of Λb baryons are analyzed in the factorization approximation. We use the covariant oscillator quark model to evaluate the heavy → heavy and heavy → light form factors. When applied in the heavy quark limit, our form factors satisfy all the constraints imposed by heavy quark symmetry. The decay rates and up-down asymmetries for Λb baryon decaying into Λc + P(V) are calculated. It is found that the up-down asymmetry is negative in all these decay modes. Furthermore, the prediction Br(Λb → Λ + J/ψ) = 2.49 × 10−4 is consistent with the recent experimental data. Finally it is pointed out that the CKM-Wolfenstein parameter p2 + η2 , where η is the CP phase, can be determined from the ratio of the widths and Λb → ΛJ/ψ, independent of the QCD parameter. The value of (p2 + η2)1/2 calculated in our model agrees very well with the value recently predicted by Rosner.