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Semileptonic B¯c*→(P,V)ℓ−ν¯ℓ decays within the self-consistent light-front quark model

Qin Chang1,2, Jianying Qian1, Liting Wang1,*, Xiaolin Wang1, Shuai Xu3, and Jie Zhu4

  • *Contact author: wanglt@htu.edu.cn
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Phys. Rev. D 114, 073001 – Published 6 October, 2026

DOI: https://doi.org/10.1103/hbx2-djvf

Abstract

Motivated by the recent observation of the Bc* meson by the ATLAS Collaboration and its promising discovery potential at future high-luminosity colliders, we investigate the semileptonic decays B¯c*→(P,V)ℓ−ν¯ℓ (P=D, Bd,s, ηc(1S,2S,3S); V=D*, Bd,s*, ψ(1S,2S,3S)) in the Standard Model. Using the relevant form factors obtained in the self-consistent covariant light-front quark model, we present theoretical predictions for several physical observables, including the branching fraction, the ratios of branching fractions R(L), the longitudinal polarization fraction of the daughter vector meson, the τ lepton spin asymmetry, and the forward-backward asymmetry. It is found that the branching fractions for the Cabibbo-favored B¯c*→B¯s*e−ν¯e and B¯s*μ−ν¯μ decays reach the order of O(10−6), which might be firstly observed at the future high-luminosity Large Hadron Collider.

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Phys. Rev. D 114, 073001– Published 6 October, 2026
  • Received 24 June 2026
  • Accepted 22 September 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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