Form Factors for B_c^*→ η_c+lν_l at NLO in QCD

2025/05/27 by Tao Wei, Tao, Wei, Ya-Hui Zhao +7
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Particle physics theoretical and experimental studies #Black Holes and Theoretical Physics

paper · pdf · doi:10.48550/arxiv.2505.20682

Abstract

We present the Non-Relativistic QCD (NRQCD) calculations at the next-to-leading order (NLO) of α_s for B_c^*→ η_c vector, axial-vector, tensor and axial-tensor form factors, and obtain complete analytical expressions for the form factors, along with their asymptotic forms in the hierarchical heavy quark limit. Our results show that the NLO corrections are both sizable and well-behaved in the low squared transfer momentum (q²) region. Using the NRQCD + lattice + z-series method, we further provide theoretical predictions for B_c^*→ η_c form factors across the full physical q² range. Based on these predicted form factors, we finally compute the decay widths and branching fractions for the semileptonic decays B_c^*→ η_c+lν_l.

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