Observation of the decay ψ(3686)→ Σ- (Σ)over-bar+ and measurement of its angular distribution

作者：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.; Ferroli, R. Baldini; Balossino, I.; Ban, Y.; Batozskaya, V.; Becker, D.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bloms, J.; Bortone, A.; Boyko, I.; Briere, R. A.; Brueggemann, A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, W. L.; Chelkov, G.; Chen, C.; Chen, Chao; Chen, G.; Chen, H. S.

来源：JOURNAL OF HIGH ENERGY PHYSICS, 2022, (12): 016.

DOI：10.1007/JHEP12(2022)016

• Branching fraction
• e(+)-e(-)
• Experiments
• Particle and Resonance Production
• Spectroscopy

Using (448.1 +/- 2.9) x 10(6) psi(3686) events collected with the BESIII detector at the BEPCII collider, the decay psi(3686) -> Sigma(-) (Sigma) over bar (+) is observed for the first time with a branching fraction of (2.82 +/- 0.04(stat). +/- 0.08(syst).) x 10(-4), and the angular parameter alpha(Sigma)- is measured to be 0.96 +/- 0.09(stat). +/- 0.03(syst.).