Study of $e^{+}{e}^{-}\to {\Sigma }^0\overline{\Sigma }{}^0$ and ${\Sigma }^{+}\overline{\Sigma }{}^{-}$ by Initial State Radiation Method at Belle

Abstract

The processes $e^{+}{e}^{-}\to {\Sigma }^0\overline{\Sigma }{}^0$ and $e^{+}{e}^{-}\to {\Sigma }^{+}\overline{\Sigma }{}^{-}$ are studied using initial-state-radiation events in a sample of 980 $\,\mbox{fb}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. The cross sections from the mass threshold to $3\mathrm{Ge}\mathrm{V}/c^2$ and the effective form factors of ${\Sigma }^0$ and ${\Sigma }^{+}$ are measured. In the charmonium region, we observe the decays $J/\psi \to {\Sigma }^0\overline{\Sigma }{}^0$ and $J/\psi \to {\Sigma }^{+}\overline{\Sigma }{}^{-}$ and determine the respective branching fractions.

arXiv commentaccepted by Phys. Rev. D

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• Chiral-odd generalized parton distributions for the low-lying octet baryons
• Accessing baryon-antibaryon generalized distribution amplitudes in $e^{\pm }\gamma \to e^{\pm }B\bar{B}$