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Semileptonic decays of Λ→pℓ−ν¯ℓ in light-front dynamics

Chong-Chung Lih* and Chao-Qiang Geng†

  • *Contact author: cclih123@gmail.com
  • †Contact author: cqgeng@ucas.ac.cn
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Phys. Rev. C 114, 045206 – Published 21 October, 2026

DOI: https://doi.org/10.1103/f668-vzjw

Abstract

We investigate the exclusive semileptonic decays of Λ→pℓ−ν¯ℓ(ℓ=e,μ) within the standard model using the light-front quark model. The transition form factor behaviors of Λ→p 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 obtain that the branching ratios of Λ→pe−ν¯e and pμ−ν¯μ, including nonvalence contributions, are around 8.32×10−4 and 1.31×10−4, which are consistent with the latest measurements from the BESIII Collaboration, respectively. Our results indicate that nonvalence contributions can play a non-negligible role in the semileptonic baryon decays within the light-front framework.

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Phys. Rev. C 114, 045206– Published 21 October, 2026
  • Received 9 June 2026
  • Revised 15 August 2026
  • Accepted 21 September 2026
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