Evidence for the semileptonic decays Λ c + → Σ ± π ∓ e + ν e

M. Ablikim; Mikhail N. Achasov; P. Adlarson; Xi‐Cheng Ai; R. Aliberti; A. Amoroso; Qinchen An; Yu Bai; O. Bakina; Y. Ban; H. -R. Bao; V. Batozskaya; K. Begzsuren; N. Berger; M. Berlowski; M. Bertani; D. Bettoni; F. Bianchi; E. Bianco; A. Bortone; I. Boyko; Roy A. Briere; A. Brueggemann; Hao Cai; Minghui Cai; X. Cai; A. Calcaterra; G. F. Cao; N. Cao; S. A. Cetin; X. Y. Chai; J. F. Chang; G. R. Che; Y. Che; G. Chelkov; Chao Chen; C. Chen; G. Chen; H. Y. Chen; H. S. Chen; M. L. Chen; S. M. Chen; S. J. Chen; S. L. Chen; T. Chen; X. T. Chen; X. R. Chen; Y. Q. Chen; Y. B. Chen; Z. K. Chen; Z. J. Chen; S.-K. Choi; X. Chu; G. Cibinetto; F. Cossio; J. J. Cui; H. L. Dai; J. P. Dai; A. Dbeyssi; R. E. de Boer; D. Dedovich; C. Q. Deng; Z. Y. Deng; A. Denig; I. Denysenko; M. Destefanis; F. De Mori; B. Ding; X. X. Ding; Y. Ding; Y. Ding; Y. X. Ding; J. Dong; L. Y. Dong; M. Y. Dong; Xiangyang Dong; Minghui Du; S. X. Du; S. X. Du; Y. Y. Duan; Z. H. Duan; P. Egorov; Gaofeng Fan; J. J. Fan; Y. H. Fan; Jieping Fang; Jian Fang; S. S. Fang; W. X. Fang; Yong Fang; R. Farinelli; L. Fava; F. Feldbauer; G. Felici; C. Q. Feng; J. H. Feng; Y. T. Feng; M. Fritsch; C. D. Fu; J. Fu

doi:10.1103/xk1n-14dk

Evidence for the semileptonic decays Λ c + → Σ ± π ∓ e + ν e

Physical review. D/Physical review. D. 2026 Open access

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Authors: M. Ablikim, Mikhail N. Achasov, P. Adlarson, Xi‐Cheng Ai, R. Aliberti, A. Amoroso, Qinchen An, Yu Bai, O. Bakina, Y. Ban, H. -R. Bao, V. Batozskaya

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K. Begzsuren, N. Berger, M. Berlowski, M. Bertani, D. Bettoni, F. Bianchi, E. Bianco, A. Bortone, I. Boyko, Roy A. Briere, A. Brueggemann, Hao Cai, Minghui Cai, X. Cai, A. Calcaterra, G. F. Cao, N. Cao, S. A. Cetin, X. Y. Chai, J. F. Chang, G. R. Che, Y. Che, G. Chelkov, Chao Chen, C. Chen, G. Chen, H. Y. Chen, H. S. Chen, M. L. Chen, S. M. Chen, S. J. Chen, S. L. Chen, T. Chen, X. T. Chen, X. R. Chen, Y. Q. Chen, Y. B. Chen, Z. K. Chen, Z. J. Chen, S.-K. Choi, X. Chu, G. Cibinetto, F. Cossio, J. J. Cui, H. L. Dai, J. P. Dai, A. Dbeyssi, R. E. de Boer, D. Dedovich, C. Q. Deng, Z. Y. Deng, A. Denig, I. Denysenko, M. Destefanis, F. De Mori, B. Ding, X. X. Ding, Y. Ding, Y. Ding, Y. X. Ding, J. Dong, L. Y. Dong, M. Y. Dong, Xiangyang Dong, Minghui Du, S. X. Du, S. X. Du, Y. Y. Duan, Z. H. Duan, P. Egorov, Gaofeng Fan, J. J. Fan, Y. H. Fan, Jieping Fang, Jian Fang, S. S. Fang, W. X. Fang, Yong Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Q. Feng, J. H. Feng, Y. T. Feng, M. Fritsch, C. D. Fu, J. Fu

DOI: 10.1103/xk1n-14dk

Cited by: 1

References: 33

Abstract

Using 4.5 fb − 1 of e + e − collision data collected by the BESIII detector at center-of-mass energies between 4.600 and 4.699 GeV, we search for the semileptonic decays Λ c + → Σ + π − e + ν e and Λ c + → Σ − π + e + ν e for the first time. Assuming their branching fractions are equal under isospin symmetry, evidence for Λ c + → Σ ± π ∓ e + ν e is reported with a significance of 3.6 σ . The corresponding branching fraction is measured to be B ( Λ c + → Σ ± π ∓ e + ν e ) = ( 7.7 − 2.3 stat + 2.5 ± 1.3 syst ) × 10 − 4 , which is consistent with quark model predictions within two standard deviations.

Fields of Study & Subjects

Particle physics theoretical and experimental studies Quantum Chromodynamics and Particle Interactions High-Energy Particle Collisions Research

Publication details

Journal / source: Physical review. D/Physical review. D.
Publisher: American Physical Society (APS)
Volume: 113
Issue: 7
Publication date: 20 March 2026
Language: EN

References 33