A model to explain angular distributions of $J/\psi$ and $\psi (2S)$ decays into $\Lambda \overline{\Lambda }$ and ${\Sigma }^0{\overline{\Sigma }}^0$

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.

arXiv comment6 pages, 7 figures, to be published in Chinese Physics C

References in corpus (10)

• Study of e+e- --> Lambda anti-Lambda, Lambda anti-Sigma0, Sigma0 anti-Sigma0 using Initial State Radiation with BABAR
• First Measurements of Timelike Form Factors of the Hyperons, Lambda0, Sigma0, Sigma+, Xi0, Xi-, and Omega-, and Evidence of Diquark Correlations
• Study of $J/\psi$ and $\psi (3686)$ decay to $\Lambda \bar{\Lambda }$ and ${\Sigma }^0{\bar{\Sigma }}^0$ final states
• Study of $J/\psi$ and $\psi (3686)\to \Sigma (1385{)}^0\bar{\Sigma }(1385{)}^0$ and ${\Xi }^0{\bar{\Xi }}^0$
• Determination of the number of ${\psi }^{\prime }$ event at BESIII
• Study of $\psi$ decays to the ${\Xi }^{-}{\bar{\Xi }}^{+}$ and $\Sigma (1385{)}^{\mp }\bar{\Sigma }(1385{)}^{\pm }$ final states
• Branching Fraction Measurements of psi(2S) Decay to Baryon-Antibaryon Final States
• Study of J/psi decays to Lambda Lambdabar and Sigma0 Sigma0bar
• Measurements of psi(2S) decays to octet baryon-antibaryon pairs
• Determination of the relative phase in ψ' and J/ψ decays into baryon and antibaryon

Cited by in corpus (5)

• The effective radius for production of baryon-antibaryon pairs from $\psi$ decays
• Amplitudes separation and strong-electromagnetic relative phase in the $\psi (2S)$ decays into baryons
• Baryon decays $J/\psi \to B\bar{B}$ within the QCD factorisation framework
• Isospin violating decays of vector charmonia
• A description of charmonia decays $J/\psi \to B\bar{B}$ within the QCD factorisation framework