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Semileptonic decays of Λc+ in light-front quark model with nonvalence contributions

Chong-Chung Lih* and Chao-Qiang Geng†

  • Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China and School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China

  • *Contact author: cclih123@gmail.com
  • †Contact author: cqgeng@ucas.ac.cn
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Phys. Rev. D 112, 076023 – Published 17 October, 2025

DOI: https://doi.org/10.1103/b224-bcrn

Abstract

We investigate the exclusive semilpetonic decays of Λc+→(Λ/n)ℓ+νℓ(ℓ=e,μ) within the standard model by using the light-front quark model (LFQM). The form factor behaviors are obtained from the effective treatment of nonvalence contributions in addition to the valence ones in the Drell-Yan-West frame due to the Bethe-Salpeter formalism. Based on these form factors, we find that the decay branching ratios of Λc+→(Λe+νe,Λμ+νe,ne+νe,nμ+νe) are about (3.39,3.21,0.36,0.35)% with the nonvalence contributions, which are consistent with the recent experimental measurements at BESIII. Furthermore, we use the experimental data to fit the β parameters in the baryonic distribution amplitudes under the LFQM, resulting in (βΛc,βΛ,βn)=(0.58±0.08,0.52±0.08,0.44±0.04).

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Phys. Rev. D 112, 076023– Published 17 October, 2025
  • Received 23 March 2025
  • Accepted 30 September 2025
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