1. A model to explain the angular distribution of $ {{{J /\psi}}} $ and $ {{\psi(2S)}} $ decay into $ {\Lambda \overline{\Lambda}} $ and ${\Sigma^0 \overline{\Sigma^0}} $
- Author
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G. Mezzadri, I. Garzia, L. Lavezzi, J. Chai, Chongyang Leng, S. Sosio, R. Farinelli, L. Fava, S. Spataro, M. Da Rocha Rolo, R. Baldini Ferroli, F. Cossio, M. Bertani, L. Yan, I. Balossino, A. Mangoni, D. Bettoni, G. Cibinetto, A. Amoroso, M. Destefanis, A. Rivetti, M. Alekseev, S. Marcello, F. Bianchi, P. Patteri, F. De Mori, G. Felici, M. Maggiora, M. Greco, M. Savrie, and S. Pacetti
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Overline ,81V05 ,Meson ,Mathematics::Complex Variables ,010308 nuclear & particles physics ,Computer Science::Information Retrieval ,High Energy Physics::Phenomenology ,Hyperon ,Sigma ,Astronomy and Astrophysics ,Lambda ,01 natural sciences ,High Energy Physics - Phenomenology ,Angular distribution ,0103 physical sciences ,High Energy Physics::Experiment ,010306 general physics ,Instrumentation - Abstract
BESIII data show a particular angular distribution for the decay of the $J/\psi$ and $\psi(2S)$ mesons into the hyperons $\Lambda\overline{\Lambda}$ and $\Sigma^0\overline{\Sigma}^0$. More in details the angular distribution of the decay $\psi(2S) \to \Sigma^0\overline{\Sigma}^0$ exhibits an opposite trend with respect to that of the other three channels: $J/\psi \to \Lambda\overline{\Lambda}$, $J/\psi \to \Sigma^0\overline{\Sigma}^0$ and $\psi(2S) \to \Lambda\overline{\Lambda}$. We define a model to explain the origin of this phenomenon., Comment: 6 pages, 7 figures, to be published in Chinese Physics C
- Published
- 2019