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Measurement of the absolute branching fraction for Λc+ → Λe+νe M. Ablikim, M. N. Achasov, X. C. Ai [et.al.]

Contributor(s): Ablikim, M | Ai, X. C | Chelkov, G. A | Achasov, M. N | Томский государственный университет Радиофизический факультет Научные подразделения РФФMaterial type: ArticleArticleSubject(s): BESIII, детектор | BEPCII, коллайдер | электроныGenre/Form: статьи в журналах Online resources: Click here to access online In: Physical Review Letters Vol. 115, № 22. P. 221805 (1-7)-Abstract: We report the first measurement of the absolute branching fraction for Λ+c→Λe+νe. This measurement is based on 567  pb−1 of e+e− annihilation data produced at s√=4.599  GeV, which is just above the Λ+cΛ¯−c threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Λ+c→Λe+νe)=[3.63±0.38(stat)±0.20(syst)]%, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Λ+c→Λe+νe is the benchmark for those of other Λ+c semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.
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We report the first measurement of the absolute branching fraction for Λ+c→Λe+νe. This measurement is based on 567  pb−1 of e+e− annihilation data produced at s√=4.599  GeV, which is just above the Λ+cΛ¯−c threshold. The data were collected with the BESIII detector at the BEPCII storage rings. The branching fraction is determined to be B(Λ+c→Λe+νe)=[3.63±0.38(stat)±0.20(syst)]%, representing a significant improvement in precision over the current indirect determination. As the branching fraction for Λ+c→Λe+νe is the benchmark for those of other Λ+c semileptonic channels, our result provides a unique test of different theoretical models, which is the most stringent to date.

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