First measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi mathvariant="normal">Σ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>n</mml:mi> <mml:mo>→</mml:mo> <mml:mi mathvariant="normal">Λ</mml:mi> <mml:mi>p</mml:mi> </mml:mrow> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi mathvariant="normal">Σ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>n</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi mathvariant="normal">Σ</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>p</mml:mi> </mml:mrow> </mml:math> cross sections via <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi mathvariant="normal">Σ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math> -nucleus scattering at an electron-positron collider

Anonymous; M. N. Achasov; P. Adlarson; X. C. Ai; R. Aliberti; A. Amoroso; Q. An; Y. 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; R. A. Briere; A. Brueggemann; H. Cai; M. H. Cai; X. Cai; A. Calcaterra; G. F. Cao; N. Cao; S. A. Cetin; X. Y. Chai; J. F. Chang; G. R. Che; Y. Z. Che; G. Chelkov; C. Chen; C. H. Chen; Chao Chen; G. Chen; H. S. Chen; H. Y. Chen; M. L. Chen; S. J. Chen; S. L. Chen; S. M. Chen; T. Chen; X. R. Chen; X. T. Chen; Y. B. Chen; Y. Q. Chen; Z. J. Chen; Z. K. 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; X. Dong; M. C. Du; S. X. Du; Y. Y. Duan; Z. H. Duan; P. Egorov; G. F. Fan; J. J. Fan; Y. H. Fan; J. Fang; J. Fang; S. S. Fang; W. X. Fang; Y. Q. Fang; R. Farinelli; L. Fava; F. Feldbauer; G. Felici; C. Q. Feng; J. H. Feng; Y. T. Feng; M. Fritsch; C. D. Fu; J. L. Fu

doi:10.1103/nzzh-4f6y

First measurement of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi mathvariant="normal">Σ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>n</mml:mi> <mml:mo>→</mml:mo> <mml:mi mathvariant="normal">Λ</mml:mi> <mml:mi>p</mml:mi> </mml:mrow> </mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi mathvariant="normal">Σ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>n</mml:mi> <mml:mo>→</mml:mo> <mml:msup> <mml:mi mathvariant="normal">Σ</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>p</mml:mi> </mml:mrow> </mml:math> cross sections via <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi mathvariant="normal">Σ</mml:mi> <mml:mo>+</mml:mo> </mml:msup> </mml:math> -nucleus scattering at an electron-positron collider

Physical review. C 2026 Open access

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Authors: Anonymous, M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. 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, R. A. Briere, A. Brueggemann, H. Cai, M. H. Cai, X. Cai, A. Calcaterra, G. F. Cao, N. Cao, S. A. Cetin, X. Y. Chai, J. F. Chang, G. R. Che, Y. Z. Che, G. Chelkov, C. Chen, C. H. Chen, Chao Chen, G. Chen, H. S. Chen, H. Y. Chen, M. L. Chen, S. J. Chen, S. L. Chen, S. M. Chen, T. Chen, X. R. Chen, X. T. Chen, Y. B. Chen, Y. Q. Chen, Z. J. Chen, Z. K. 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, X. Dong, M. C. Du, S. X. Du, Y. Y. Duan, Z. H. Duan, P. Egorov, G. F. Fan, J. J. Fan, Y. H. Fan, J. Fang, J. Fang, S. S. Fang, W. X. Fang, Y. Q. Fang, R. Farinelli, L. Fava, F. Feldbauer, G. Felici, C. Q. Feng, J. H. Feng, Y. T. Feng, M. Fritsch, C. D. Fu, J. L. Fu

DOI: 10.1103/nzzh-4f6y

Cited by: 0

References: 64

Abstract

Using ( 1.0087 ± 0.0044 ) × 10 10 J / ψ events collected with the BESIII detector at the BEPCII storage ring, the reactions Σ + n → Λ p and Σ + n → Σ 0 p are studied, where the Σ + baryon is produced in the process J / ψ → Σ + Σ ¯ − and the neutron is a component of the Be 9 , C 12 , and Au 197 nuclei in the beam pipe. Clear signals of these two reactions are observed for the first time. Their cross sections are measured to be σ ( Σ + + Be 9 → Λ + p + X ) = ( 45.2 ± 12 . 1 stat ± 7 . 2 sys ) mb and σ ( Σ + + Be 9 → Σ 0 + p + X ) = ( 29.8 ± 9 . 7 stat ± 6 . 9 sys ) mb for a Σ + average momentum of 0.992 GeV / c , within a range of ± 0.015 GeV / c , where X represents the residual nucleus. This is the first study of

Fields of Study & Subjects

Quantum Chromodynamics and Particle Interactions Muon and positron interactions and applications Particle physics theoretical and experimental studies

Publication details

Journal / source: Physical review. C
Volume: 113
Issue: 3
Publication date: 7 January 2026
Language: EN

References 64