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

IF 5.3 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review D Pub Date : 2025-10-17 DOI:10.1103/b224-bcrn
Chong-Chung Lih, Chao-Qiang Geng
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引用次数: 0

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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具有非价态贡献的光前夸克模型中Λc+的半光子衰减
利用光前夸克模型（LFQM）研究了标准模型中Λc+→（Λ/n） r +ν r （r =e,μ）的排他半振子衰变。形式因子行为是通过有效处理Drell-Yan-West框架中由于Bethe-Salpeter形式主义导致的价态贡献之外的非价态贡献而得到的。基于这些形式因子，我们发现Λc+→（Λe+νe，Λμ+νe,ne+νe,nμ+νe）的衰变分支比约为（3.39,3.21,0.36,0.35）%，其中非价态贡献与BESIII最近的实验测量结果一致。利用实验数据拟合LFQM下重子分布幅值中的β参数，得到（βΛc,βΛ，βn）=（0.58±0.08,0.52±0.08,0.44±0.04）。
本文章由计算机程序翻译，如有差异，请以英文原文为准。
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来源期刊
Physical Review D
Physical Review D 物理-天文与天体物理
CiteScore
9.20
自引率
36.00%
发文量
0
审稿时长
2 months
期刊介绍： Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics. PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including: Particle physics experiments, Electroweak interactions, Strong interactions, Lattice field theories, lattice QCD, Beyond the standard model physics, Phenomenological aspects of field theory, general methods, Gravity, cosmology, cosmic rays, Astrophysics and astroparticle physics, General relativity, Formal aspects of field theory, field theory in curved space, String theory, quantum gravity, gauge/gravity duality.
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