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.

arXiv comment9 pages, 2 figures

References in corpus (28)

• Design and Construction of the BESIII Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Coherent Exclusive Exponentiation For Precision Monte Carlo Calculations
• Soft-core hyperon-nucleon potentials
• Soft-core baryon-baryon potentials for the complete baryon octet
• Do hyperons exist in the interior of neutron stars ?
• Strangeness in Nuclei and Neutron Stars
• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
• The Juelich hyperon-nucleon model revisited
• 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
• Hyperon-nucleon interaction within chiral effective field theory revisited
• Number of $J/\psi$ events at BESIII
• Observation of Spin-Dependent Charge Symmetry Breaking in $\Lambda N$ Interaction: Gamma-Ray Spectroscopy of ${}_{\Lambda }^4$He
• Measurement of the Xi-p Scattering Cross Sections at Low Energy
• ${\Sigma }^{+}$ and ${\bar{\Sigma }}^{-}$ polarization in the $J/\psi$ and $\psi (3686)$ decays
• Ab-initio calculations of charge symmetry breaking in the A=4 hypernuclei
• Hyperons: the strange ingredients of the nuclear equation of state
• Hyperon-nucleon interaction in chiral effective field theory at next-to-next-to-leading order
• First study of reaction ${\Xi }^{0}n\to {\Xi }^{-}p$ using ${\Xi }^0$-nucleus scattering at an electron-positron collider
• Constraints on the $\Lambda$-neutron interaction from charge symmetry breaking in the ${}_{\mathbf{\Lambda }}^4\mathbf{He}$--${}_{\mathbf{\Lambda }}^4\mathbf{H}$ hypernuclei
• 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
• Optical model potential analysis of $\bar{n}A$ and $nA$ interactions
• Search for the hyperon semileptonic decay ${\Xi }^{-}\to {\Xi }^0{e}^{-}\overline{{\nu }_e}$
• First measurement of $\Lambda N$ inelastic scattering with $\Lambda$ from $e^{+}{e}^{-}\to J/\psi \to \Lambda \bar{\Lambda }$
• ${\Xi }^{-}$ and $\Omega$ Distributions in Hadron-Nucleus Interactions

Cited by in corpus (1)

• Observation of $\bar{\Lambda }p\to K^{+}{\pi }^{+}{\pi }^{-}{\pi }^0$ and $\bar{\Lambda }p\to K^{+}{\pi }^{+}{\pi }^{-}2{\pi }^0$