M. P. Khanna

Hadronic Weak Decays of Λb Baryon in the Covariant Oscillator Quark Model

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 ρ 2 + η 2 , where η is the CP phase, can be determined from the ratio of the widths Λb → Λ ¯ D 0 and Λb → ΛJ/ψ, independent of the QCD parameter. The value of (ρ 2 + η 2 ) 1/2 calculated in our model agrees very well with the value recently predicted by Rosner.

Charmless two-body hadronic decays of

Using a theoretical framework based on the next-to-leading order QCD improved effective Hamiltonian, we have estimated the branching ratios and asymmetry parameters for the two body charmless nonleptonic decay modes of

\Lambda_b

\Lambda_b

baryon

baryon i.e.

Possibility of extracting the weak phase gamma from Lambda(b) ---> Lambda D0 decays

\Lambda_b \to p (\pi/\rho),~p(K/K^*)

Weak Radiative Decay Λb →Λ γ and Quark-Confined Effects in the Covariant Oscillator Quark Model

and

BEAUTY-CONSERVING STRANGENESS-CHANGING TWO-BODY HADRONIC DECAYS OF BEAUTY BARYONS

\Lambda (\pi/\rho)

B-meson weak decays into baryon-antibaryon pairs in SU(3)

, within the framework of generalized factorization. The nonfactorizable contributions are parametrized in terms of the effective number of colors,

Magnetic moments of baryons in higher symmetry schemes including charm

N_c^{eff}

Smearing effects of and a1 meson widths on heavy-hadron decays

. So in addition to the naive factorization approach (