Semileptonic Decays of Λ→ p ℓ− ν̅ℓ in the Light-Front Dynamics
Abstract
We investigate the exclusive semileptonic decays of Λ→ p ℓ− ν̅ℓ (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→ p e− ν̅e and p μ− ν̅μ, 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.
Versions
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BibTeX
@misc{lih2026semileptonic,
title = {{Semileptonic Decays of $Λ\to p \ell^- \barν_\ell$ in the Light-Front Dynamics}},
author = {Chong-Chung Lih and Chao-Qiang Geng},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.01768},
eprint = {2606.01768},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.01768},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Semileptonic Decays of Λ→ p ℓ^− ν̅_ℓ in the Light-Front Dynamics
AU - Chong-Chung Lih
AU - Chao-Qiang Geng
PY - 2026
DA - 2026/10/21
PB - arXiv
DO - 10.48550/arxiv.2606.01768
UR - https://arxiv.org/abs/2606.01768
AB - We investigate the exclusive semileptonic decays of Λ→ p ℓ^− ν̅_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→ p e^− ν̅_e and p μ^− ν̅_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.
ER -