Charmless two body hadronic decays of ${\Lambda }_b$ baryon

Abstract

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 ${\Lambda }_b$ baryon i.e. ${\Lambda }_b\to p(\pi /\rho ),p(K/K^{\ast })$ and $\Lambda (\pi /\rho )$, within the framework of generalized factorization. The nonfactorizable contributions are parametrized in terms of the effective number of colors, $N_c^{eff}$. So in addition to the naive factorization approach ($N_c^{eff}=3$), here we have taken two more values for $N_c^{eff}$ i.e., $N_c^{eff}=2$ and $\infty$. The baryonic form factors at maximum momentum transfer ($q_m^2$) are evaluated using the nonrelativistic quark model and the extrapolation of the form factors from $q_m^2$ to the required $q^2$ value is done by assuming the pole dominance. The obtained branching ratios for ${\Lambda }_b\to p\pi ,pK$ processes lie within the present experimental upper limit .

arXiv commentLatex, 16 pages

References in corpus (17)

• Weak Decays Beyond Leading Logarithms
• Weak Radiative B-Meson Decay Beyond Leading Logarithms
• Experimental Tests of Factorization in Charmless Non-Leptonic Two-Body B Decays
• Updated Estimate of Running Quark Masses
• An analysis of two-body non-leptonic B decays involving light mesons in the standard model
• Charmless Hadronic Two-body Decays of B_u and B_d Mesons
• Nonleptonic Weak Decays of Bottom Baryons
• CP-Violating Asymmetries in Charmless Non-Leptonic Decays $B\to PP,PV,VV$ in the Factorization Approach
• 1/M Corrections to Baryonic Form Factors in the Quark Model
• An Upgraded Analysis of $\epsilon \prime /\epsilon$ at the Next-to-Leading Order
• CP Violation and Strong Phases from Penguins in ${\mathbf{B}}^{\pm }\to \mathbf{PP}$ and ${\mathbf{B}}^{\pm }\to \mathbf{VP}$ Decays
• Updated Analysis of a_1 and a_2 in Hadronic Two-body Decays of B Mesons
• Charmless Hadronic Two-body Decays of the B_s Mesons
• Measurements of the B^0_s and Λ_b Lifetimes
• Penguin decays of B mesons
• Space-like Penguin Effects in $B\to PP$ Decays
• Effect of the Space-like Penguin Diagrams on CP Asymmetries in Exclusive B Decays

Cited by in corpus (12)

• Anatomy of the pQCD Approach to the Baryonic Decays ${\Lambda }_b\to p\pi ,pK$
• Measurement of $b$-hadron branching fractions for two-body decays into charmless charged hadrons
• Measurements of Direct CP Violating Asymmetries in Charmless Decays of Strange Bottom Mesons and Bottom Baryons
• Observation of New Charmless Decays of Bottom Hadrons
• Measurements of Direct CP-Violating Asymmetries in Charmless Decays of Bottom Baryons
• ${\Lambda }_b\to p$ transition form factors in perturbative QCD
• Branching fractions and direct CP asymmetries of charmless decay modes at the Tevatron
• Fourth generation effect on ${\Lambda }_b$ decays
• Estimates of exchange topological contributions and $CP$-violating observables in ${\Lambda }_b\to \Lambda \varphi$ decay
• Analysis of ${\Lambda }_b\to$ $p{K}^{-}$ and $p{\pi }^{-}$ decays in a flavor changing $Z^{\prime }$ model
• Search for Lambda_b -> p pi and Lambda_b -> p K decays in p-pbar collisions at sqrt(s) = 1.96 TeV
• Beauty physics with B(s) and Lambda(b)