Work

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

Year: 2025

Type: article

Abstract: We investigate the exclusive semilpetonic decays of Λ c + → ( Λ / n ) ℓ + ν ℓ ( 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 Λ c + → ( Λ e + ν e , Λ μ + ν e , n e + ν e , n μ + ν e ) 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 ( β Λ c , β Λ , β n ) = ( 0.58 ± 0.08 , 0.52 ± 0.08 , 0.44 ± 0.04 ) .

Source: Physical review. D/Physical review. D.

DOI: 10.1103/b224-bcrn

Authors: Chong-Chung Lih, Chao-Qiang Geng

Institutions: Hunan Normal University, University of Chinese Academy of Sciences

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Funders: National Natural Science Foundation of China, National Key Research and Development Program of China

Awards: G3289481219, G5847793060