The study of the Cabibbo-favored semileptonic decay Λc+→Λe+νe is reported using a 4.5 fb-1 data sample of e+e- annihilations collected at center-of-mass energies ranging from 4.600 GeV to 4.699 GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be B(Λc+→Λe+νe)=(3.56±0.11stat±0.07syst)%, which is the most precise measurement to date. Furthermore, we perform an investigation of the internal dynamics in Λc+→Λe+νe. We provide the first direct comparisons of the differential decay rate and form factors with those predicted from lattice quantum chromodynamics (LQCD) calculations. Combining the measured branching fraction with a q2-integrated rate predicted by LQCD, we determine |Vcs|=0.936±0.017B±0.024LQCD±0.007τΛc.

Study of the Semileptonic Decay Λ_{c}^{+}→Λe^{+}ν_{e}

Amoroso, A;Bianchi, F;Bortone, A;Destefanis, M;De Mori, F;Fava, L;Felici, G;Greco, M;Lavezzi, L;Maggiora, M;Marcello, S;Sosio, S;Spataro, S;
2022-01-01

Abstract

The study of the Cabibbo-favored semileptonic decay Λc+→Λe+νe is reported using a 4.5 fb-1 data sample of e+e- annihilations collected at center-of-mass energies ranging from 4.600 GeV to 4.699 GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be B(Λc+→Λe+νe)=(3.56±0.11stat±0.07syst)%, which is the most precise measurement to date. Furthermore, we perform an investigation of the internal dynamics in Λc+→Λe+νe. We provide the first direct comparisons of the differential decay rate and form factors with those predicted from lattice quantum chromodynamics (LQCD) calculations. Combining the measured branching fraction with a q2-integrated rate predicted by LQCD, we determine |Vcs|=0.936±0.017B±0.024LQCD±0.007τΛc.
2022
129
23
231803-1
231803-9
Ablikim, M; Achasov, M N; Adlarson, P; Albrecht, M; Aliberti, R; Amoroso, A; An, M R; An, Q; Bai, X H; Bai, Y; Bakina, O; Baldini Ferroli, R; Balossin...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1887622
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