Semileptonic decays of $Λ^{+}_{c}$ in light-front quark model with nonvalence contributions
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| Format: | Preprint |
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2025
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| _version_ | 1866918151925530624 |
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| author | Lih, Chong-Chung Geng, Chao-Qiang |
| author_facet | Lih, Chong-Chung Geng, Chao-Qiang |
| contents | We investigate the exclusive semilpetonic decays of $Λ^{+}_{c}\to (Λ/n) \ell^{+} ν_{\ell}~(\ell=e,μ)$ 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 $Λ^{+}_{c}\to (Λe^{+} ν_{e},\,Λμ^{+} ν_{e} ,\, n e^{+} ν_{e},\, n μ^{+} ν_{e})$ are about $ (3.39,\,3.21,\,0.36,\,0.35)\%$ with the non-valence 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 ($β_{Λ_{c}},β_Λ, β_{n})= (0.58\pm0.08, 0.52\pm0.08,0.44\pm0.04)$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_12398 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Semileptonic decays of $Λ^{+}_{c}$ in light-front quark model with nonvalence contributions Lih, Chong-Chung Geng, Chao-Qiang High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Theory We investigate the exclusive semilpetonic decays of $Λ^{+}_{c}\to (Λ/n) \ell^{+} ν_{\ell}~(\ell=e,μ)$ 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 $Λ^{+}_{c}\to (Λe^{+} ν_{e},\,Λμ^{+} ν_{e} ,\, n e^{+} ν_{e},\, n μ^{+} ν_{e})$ are about $ (3.39,\,3.21,\,0.36,\,0.35)\%$ with the non-valence 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 ($β_{Λ_{c}},β_Λ, β_{n})= (0.58\pm0.08, 0.52\pm0.08,0.44\pm0.04)$. |
| title | Semileptonic decays of $Λ^{+}_{c}$ in light-front quark model with nonvalence contributions |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment High Energy Physics - Theory |
| url | https://arxiv.org/abs/2503.12398 |