Proton-Λ correlations in central Au+Au collisions at sNN=200 GeV

Le résumé fourni par la source

We report on $p\text{\ensuremath{-}}\ensuremath{\Lambda},p\text{\ensuremath{-}}\overline{\ensuremath{\Lambda}},\overline{p}\text{\ensuremath{-}}\ensuremath{\Lambda}$, and $\overline{p}\text{\ensuremath{-}}\overline{\ensuremath{\Lambda}}$ correlation functions constructed in central Au-Au collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV by the STAR experiment at RHIC. The proton and lambda source size is inferred from the $p\text{\ensuremath{-}}\ensuremath{\Lambda}$ and $\overline{p}\text{\ensuremath{-}}\overline{\ensuremath{\Lambda}}$ correlation functions. It is found to be smaller than the pion source size also measured by the STAR experiment at smaller transverse masses, in agreement with a scenario of a strong universal collective flow. The $p\text{\ensuremath{-}}\overline{\ensuremath{\Lambda}}$ and $\overline{p}\text{\ensuremath{-}}\ensuremath{\Lambda}$ correlation functions, which are measured for the first time, exhibit a large anticorrelation. Annihilation channels and/or a negative real part of the spin-averaged scattering length must be included in the final-state interactions calculation to reproduce the measured correlation function.

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