First measurement of $\Lambda N$ inelastic scattering with $\Lambda$ from $e^{+}{e}^{-}\to J/\psi \to \Lambda \bar{\Lambda }$

Abstract

Using an $e^{+}{e}^{-}$ collision data sample of $(10087\pm 44)\times 10^{6}J/\psi$ events taken at the center-of-mass energy of $3.097\mathrm{GeV}$ by the BESIII detector at the BEPCII collider, the process $\Lambda +N\to {\Sigma }^{+}+X$ is studied for the first time employing a novel method. The ${\Sigma }^{+}$ hyperons are produced by the collisions of $\Lambda$ hyperons from $J/\psi$ decays with nuclei in the material of the BESIII detector. The total cross section of $\Lambda {+}^9\mathrm{Be}\to {\Sigma }^{+}+X$ is measured to be $\sigma =(37.3\pm 4.7\pm 3.5)\mathrm{mb}$ at $\Lambda$ beam momenta within $[1.057,1.091]\mathrm{GeV}/c$, where the uncertainties are statistical and systematic, respectively. This analysis is the first study of $\Lambda$-nucleon interactions at an $e^{+}{e}^{-}$ collider, providing information and constraints relevant for the strong-interaction potential, the origin of color confinement, the unified model for baryon-baryon interactions, and the internal structure of neutron stars.

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Cited by in corpus (4)

• Prospects to study hyperon-nucleon interactions at BESIII
• Understanding of the BESIII measurement of (anti)hyperon-nucleon scattering
• 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
• Observation of $\bar{\Lambda }p\to K^{+}{\pi }^{+}{\pi }^{-}{\pi }^0$ and $\bar{\Lambda }p\to K^{+}{\pi }^{+}{\pi }^{-}2{\pi }^0$