Weak decays of B_s meson in self-consistent covariant light-front approach

2025/07/07 by Thejus Mary S., S., Thejus Mary, Rohit Dhir +1
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2507.05104

openalex publication_date 2025/07/07 · openalex created_date 2025/10/20 · openalex updated_date 2026/07/28

Abstract

We present a comprehensive study of weak transition form factors and decay observables of the B_s meson in transitions to pseudoscalar (P) and vector (V) mesons. The B_s → P(V) form factors are calculated using the self-consistent covariant light-front quark model, with a model-independent z-series expansion calibrated to lattice QCD and phenomenological inputs for quark masses and β parameters. This enables reliable q²-resolved predictions across the full kinematic range. Based on these form factors, we predict branching ratios and angular observables, including forward-backward asymmetries, polarization fractions, and leptonic convexity parameters for semileptonic decays. Nonleptonic two-body decay rates for B_s → PP and B_s → PV modes are also computed within the standard factorization framework using the same dynamical input. Comparisons with results from lattice QCD, light-cone sum rules, and other approaches are presented, highlighting both theoretical consistency and persistent tensions with experiment.

Citations

• B_(s)→ D_(s)^(*)M decays in the presence of final-state interaction
• Weak decays of \pmbB_c involving vector mesons in self-consistent covariant light-front approach
• A guide to the QCD light-cone sum rule for b-quark decays
• Bayesian inference for form-factor fits regulated by unitarity and analyticity
• Lattice QCD (focus on Charm and Beauty form factors, R(D^*), b- & c-quark masses)
• Angular distributions of B → D^(∗)ℓ ν_ℓ decays and search of New Physics
• Heavy-Quark Effective Theory

Related

• Weak decays of \pmbB_c involving vector mesons in self-consistent covariant light-front approach
• Semileptonic and nonleptonic B_s→ D_sJ decays in covariant light-front approach
• B→ S Transition Form Factors in the PQCD approach
• B decays into light mesons
• Weak form factors for heavy meson decays