{"title":"具有非价态贡献的光前夸克模型中Λc+的半光子衰减","authors":"Chong-Chung Lih, Chao-Qiang Geng","doi":"10.1103/b224-bcrn","DOIUrl":null,"url":null,"abstract":"We investigate the exclusive semilpetonic decays of Λ</a:mi>c</a:mi>+</a:mo></a:msubsup>→</a:mo>(</a:mo>Λ</a:mi>/</a:mo>n</a:mi>)</a:mo>ℓ</a:mo>+</a:mo></a:msup>ν</a:mi>ℓ</a:mo></a:msub>(</a:mo>ℓ</a:mo>=</a:mo>e</a:mi>,</a:mo>μ</a:mi>)</a:mo></a:math> 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 <j:math xmlns:j=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><j:msubsup><j:mi mathvariant=\"normal\">Λ</j:mi><j:mi>c</j:mi><j:mo>+</j:mo></j:msubsup><j:mo stretchy=\"false\">→</j:mo><j:mo stretchy=\"false\">(</j:mo><j:mi mathvariant=\"normal\">Λ</j:mi><j:msup><j:mi>e</j:mi><j:mo>+</j:mo></j:msup><j:msub><j:mi>ν</j:mi><j:mi>e</j:mi></j:msub><j:mo>,</j:mo><j:mi mathvariant=\"normal\">Λ</j:mi><j:msup><j:mi>μ</j:mi><j:mo>+</j:mo></j:msup><j:msub><j:mi>ν</j:mi><j:mi>e</j:mi></j:msub><j:mo>,</j:mo><j:mi>n</j:mi><j:msup><j:mi>e</j:mi><j:mo>+</j:mo></j:msup><j:msub><j:mi>ν</j:mi><j:mi>e</j:mi></j:msub><j:mo>,</j:mo><j:mi>n</j:mi><j:msup><j:mi>μ</j:mi><j:mo>+</j:mo></j:msup><j:msub><j:mi>ν</j:mi><j:mi>e</j:mi></j:msub><j:mo stretchy=\"false\">)</j:mo></j:math> are about <r:math xmlns:r=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><r:mo stretchy=\"false\">(</r:mo><r:mn>3.39</r:mn><r:mo>,</r:mo><r:mn>3.21</r:mn><r:mo>,</r:mo><r:mn>0.36</r:mn><r:mo>,</r:mo><r:mn>0.35</r:mn><r:mo stretchy=\"false\">)</r:mo><r:mo>%</r:mo></r:math> with the nonvalence contributions, which are consistent with the recent experimental measurements at BESIII. Furthermore, we use the experimental data to fit the <v:math xmlns:v=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><v:mi>β</v:mi></v:math> parameters in the baryonic distribution amplitudes under the LFQM, resulting in (<x:math xmlns:x=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><x:msub><x:mi>β</x:mi><x:msub><x:mi mathvariant=\"normal\">Λ</x:mi><x:mi>c</x:mi></x:msub></x:msub><x:mo>,</x:mo><x:msub><x:mi>β</x:mi><x:mi mathvariant=\"normal\">Λ</x:mi></x:msub><x:mo>,</x:mo><x:msub><x:mi>β</x:mi><x:mi>n</x:mi></x:msub><x:mo stretchy=\"false\">)</x:mo><x:mo>=</x:mo><x:mo stretchy=\"false\">(</x:mo><x:mn>0.58</x:mn><x:mo>±</x:mo><x:mn>0.08</x:mn><x:mo>,</x:mo><x:mn>0.52</x:mn><x:mo>±</x:mo><x:mn>0.08</x:mn><x:mo>,</x:mo><x:mn>0.44</x:mn><x:mo>±</x:mo><x:mn>0.04</x:mn><x:mo stretchy=\"false\">)</x:mo></x:math>.","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"35 1","pages":""},"PeriodicalIF":5.3000,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Semileptonic decays of Λc+ in light-front quark model with nonvalence contributions\",\"authors\":\"Chong-Chung Lih, Chao-Qiang Geng\",\"doi\":\"10.1103/b224-bcrn\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We investigate the exclusive semilpetonic decays of Λ</a:mi>c</a:mi>+</a:mo></a:msubsup>→</a:mo>(</a:mo>Λ</a:mi>/</a:mo>n</a:mi>)</a:mo>ℓ</a:mo>+</a:mo></a:msup>ν</a:mi>ℓ</a:mo></a:msub>(</a:mo>ℓ</a:mo>=</a:mo>e</a:mi>,</a:mo>μ</a:mi>)</a:mo></a:math> 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 <j:math xmlns:j=\\\"http://www.w3.org/1998/Math/MathML\\\" display=\\\"inline\\\"><j:msubsup><j:mi mathvariant=\\\"normal\\\">Λ</j:mi><j:mi>c</j:mi><j:mo>+</j:mo></j:msubsup><j:mo stretchy=\\\"false\\\">→</j:mo><j:mo stretchy=\\\"false\\\">(</j:mo><j:mi mathvariant=\\\"normal\\\">Λ</j:mi><j:msup><j:mi>e</j:mi><j:mo>+</j:mo></j:msup><j:msub><j:mi>ν</j:mi><j:mi>e</j:mi></j:msub><j:mo>,</j:mo><j:mi mathvariant=\\\"normal\\\">Λ</j:mi><j:msup><j:mi>μ</j:mi><j:mo>+</j:mo></j:msup><j:msub><j:mi>ν</j:mi><j:mi>e</j:mi></j:msub><j:mo>,</j:mo><j:mi>n</j:mi><j:msup><j:mi>e</j:mi><j:mo>+</j:mo></j:msup><j:msub><j:mi>ν</j:mi><j:mi>e</j:mi></j:msub><j:mo>,</j:mo><j:mi>n</j:mi><j:msup><j:mi>μ</j:mi><j:mo>+</j:mo></j:msup><j:msub><j:mi>ν</j:mi><j:mi>e</j:mi></j:msub><j:mo stretchy=\\\"false\\\">)</j:mo></j:math> are about <r:math xmlns:r=\\\"http://www.w3.org/1998/Math/MathML\\\" display=\\\"inline\\\"><r:mo stretchy=\\\"false\\\">(</r:mo><r:mn>3.39</r:mn><r:mo>,</r:mo><r:mn>3.21</r:mn><r:mo>,</r:mo><r:mn>0.36</r:mn><r:mo>,</r:mo><r:mn>0.35</r:mn><r:mo stretchy=\\\"false\\\">)</r:mo><r:mo>%</r:mo></r:math> with the nonvalence contributions, which are consistent with the recent experimental measurements at BESIII. Furthermore, we use the experimental data to fit the <v:math xmlns:v=\\\"http://www.w3.org/1998/Math/MathML\\\" display=\\\"inline\\\"><v:mi>β</v:mi></v:math> parameters in the baryonic distribution amplitudes under the LFQM, resulting in (<x:math xmlns:x=\\\"http://www.w3.org/1998/Math/MathML\\\" display=\\\"inline\\\"><x:msub><x:mi>β</x:mi><x:msub><x:mi mathvariant=\\\"normal\\\">Λ</x:mi><x:mi>c</x:mi></x:msub></x:msub><x:mo>,</x:mo><x:msub><x:mi>β</x:mi><x:mi mathvariant=\\\"normal\\\">Λ</x:mi></x:msub><x:mo>,</x:mo><x:msub><x:mi>β</x:mi><x:mi>n</x:mi></x:msub><x:mo stretchy=\\\"false\\\">)</x:mo><x:mo>=</x:mo><x:mo stretchy=\\\"false\\\">(</x:mo><x:mn>0.58</x:mn><x:mo>±</x:mo><x:mn>0.08</x:mn><x:mo>,</x:mo><x:mn>0.52</x:mn><x:mo>±</x:mo><x:mn>0.08</x:mn><x:mo>,</x:mo><x:mn>0.44</x:mn><x:mo>±</x:mo><x:mn>0.04</x:mn><x:mo stretchy=\\\"false\\\">)</x:mo></x:math>.\",\"PeriodicalId\":20167,\"journal\":{\"name\":\"Physical Review D\",\"volume\":\"35 1\",\"pages\":\"\"},\"PeriodicalIF\":5.3000,\"publicationDate\":\"2025-10-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physical Review D\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1103/b224-bcrn\",\"RegionNum\":2,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"Physics and Astronomy\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review D","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/b224-bcrn","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Physics and Astronomy","Score":null,"Total":0}
引用次数: 0
摘要
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）。
Semileptonic decays of Λc+ in light-front quark model with nonvalence contributions
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).
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:
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Gravity, cosmology, cosmic rays,
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Formal aspects of field theory, field theory in curved space,
String theory, quantum gravity, gauge/gravity duality.
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