First measurement of ΛN inelastic scattering with Λ from e+e−→J/ψ→ΛΛ¯

Le résumé fourni par la source

Using an ${e}^{+}{e}^{\ensuremath{-}}$ collision data sample of $(10\phantom{\rule{0.16em}{0ex}}087\ifmmode\pm\else\textpm\fi{}44)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $J/\ensuremath{\psi}$ events taken at the center-of-mass energy of 3.097 GeV by the BESIII detector at the BEPCII collider, the process $\mathrm{\ensuremath{\Lambda}}+N\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{+}+X$ is studied for the first time employing a novel method. The ${\mathrm{\ensuremath{\Sigma}}}^{+}$ hyperons are produced by the collisions of $\mathrm{\ensuremath{\Lambda}}$ hyperons from $J/\ensuremath{\psi}$ decays with nuclei in the material of the BESIII detector. The total cross section of $\mathrm{\ensuremath{\Lambda}}+^{9}\mathrm{Be}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Sigma}}}^{+}+X$ is measured to be $\ensuremath{\sigma}=(37.3\ifmmode\pm\else\textpm\fi{}4.7\ifmmode\pm\else\textpm\fi{}3.5)$ mb with $\mathrm{\ensuremath{\Lambda}}$ momenta within $[1.057,1.091]$ GeV/$c$, where the uncertainties are statistical and systematic, respectively. This analysis is the first study of $\mathrm{\ensuremath{\Lambda}}$-nucleon interactions at an ${e}^{+}{e}^{\ensuremath{-}}$ 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.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.