First measurement of ${\Sigma }^{+}n\to \Lambda p$ and ${\Sigma }^{+}n\to {\Sigma }^{0}p$ cross sections via ${\Sigma }^{+}$-nucleus scattering at an electron-positron collider

Abstract

Using $(1.0087\pm 0.0044)\times 10^{10}$ $J/\psi$ events collected with the BESIII detector at the BEPCII storage ring, the reactions ${\Sigma }^{+}n\to \Lambda p$ and ${\Sigma }^{+}n\to {\Sigma }^{0}p$ are studied, where the ${\Sigma }^{+}$ baryon is produced in the process $J/\psi \to {\Sigma }^{+}{\bar{\Sigma }}^{-}$ and the neutron is a component of the ${}^9\mathrm{Be}$, ${}^{12}\mathrm{C}$ and ${}^{197}\mathrm{Au}$ nuclei in the beam pipe. Clear signals of these two reactions are observed for the first time. Their cross sections are measured to be $\sigma ({\Sigma }^{+}+{}^9\mathrm{Be}\to \Lambda +p+X)=(45.2\pm 12.1_{\mathrm{stat}}\pm 7.2_{\mathrm{sys}})$ mb and $\sigma ({\Sigma }^{+}+{}^9\mathrm{Be}\to {\Sigma }^0+p+X)=(29.8\pm 9.7_{\mathrm{stat}}\pm 6.9_{\mathrm{sys}})$ mb for a ${\Sigma }^{+}$ average momentum of $0.992$ GeV/$c$, within a range of $\pm 0.015$ GeV/$c$, where $X$ represents the residual nucleus. This is the first study of ${\Sigma }^{+}$-nucleon scattering at an electron-positron collider.

9 pages, 2 figures

References in corpus (14)

• Strangeness in Nuclei and Neutron Stars
• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
• Method for detector description transformation to Unity and application in BESIII
• Estimation of the effect of hyperonic three-body forces on the maximum mass of neutron stars
• Number of $J/\psi$ events at BESIII
• ${\Sigma }^{+}$ and ${\bar{\Sigma }}^{-}$ polarization in the $J/\psi$ and $\psi (3686)$ decays
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• Test of the hyperon-nucleon interaction within leading order covariant chiral effective field theory
• Hints of Entanglement Suppression in Hyperon-Nucleon Scattering
• Exploring the ${\Sigma }^{+}p$ interaction by measurements of the correlation function
• Search for the hyperon semileptonic decay ${\Xi }^{-}\to {\Xi }^0{e}^{-}\overline{{\nu }_e}$
• First measurement of $\Lambda N$ inelastic scattering with $\Lambda$ from $e^{+}{e}^{-}\to J/\psi \to \Lambda \bar{\Lambda }$

Cited by in corpus (1)

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