Study of J/ψ and ψ(3686) decay to ΛΛ¯ and Σ0Σ¯0 final states

M. Ablikim, M. N. Achasov, S. Ahmed, M. Albrecht, A. Amoroso, F. F. An, Q. An, J. Z. Bai, Y. Bai, O. Bakina, R. Baldini Ferroli, Y. Ban, D. W. Bennett, J. V. Bennett, N. Berger, M. Bertani, D. Bettoni, J. M. Bian, F. Bianchi, E. BogerI. Boyko, R. A. Briere, H. Cai, X. Cai, O. Cakir, A. Calcaterra, G. F. Cao, S. A. Cetin, J. Chai, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. J. Chen, X. R. Chen, Y. B. Chen, X. K. Chu, G. Cibinetto, H. L. Dai, J. P. Dai, A. Dbeyssi, D. Dedovich, Z. Y. Deng, A. Denig, I. Denysenko, M. Destefanis, H. Muramatsu, R. Poling, (BESIII Collaboration)

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Abstract

Using 1310.6×106 J/ψ and 447.9×106 ψ(3686) events collected with the BESIII detector at the BEPCII e+e- collider, the branching fractions and the angular distributions of J/ψ and ψ(3686) decays to ΛΛand Σ0Σ-0 final states are measured. The branching fractions are determined, with much improved precision, to be 19.43±0.03±0.33, 11.64±0.04±0.23, 3.97±0.02±0.12 and 2.44±0.03±0.11 for J/ψ→ΛΛ-, J/ψ→Σ0Σ-0, ψ(3686)→ΛΛand ψ(3686)→Σ0Σ-0, respectively. The polar angular distributions of ψ(3686) decays are measured for the first time, while those of J/ψ decays are measured with much improved precision. In addition, the ratios of branching fractions B(ψ(3686)→ΛΛ-)B(J/ψ→ΛΛ-) and B(ψ(3686)→Σ0Σ-0)B(J/ψ→Σ0Σ-0) are determined to test the "12% rule."

Original languageEnglish (US)
Article number052003
JournalPhysical Review D
Volume95
Issue number5
DOIs
StatePublished - Mar 2017

Bibliographical note

Publisher Copyright:
© 2017 American Physical Society.

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