Strangeness in Quark Matter 2019

Femtoscopic studies on proton-Ξ− and proton-Ω− correlations in p-Pb and pp collisions with ALICE

11 Jun 2019, 18:45

2h

Sala B1+C1 (Giulia Center) (Villa Romanazzi Carducci)

Poster Poster session with "aperitivo"

Speaker

Oton Vazquez Doce (Technische Universitaet Muenchen (DE))

Description

Two-particle correlations can be used to probe the strong interaction between nucleons and multi-strange baryons. We will show measurements of correlation functions of proton-${\mathrm{\Xi }}^{-}$ pairs in p-Pb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$ = 5.02 TeV, and proton-${\mathrm{\Omega }}^{-}$ pairs produced in high-multiplicity pp collisions at $\sqrt{s}$ = 13 TeV. Utilising newly developed femtoscopic techniques, we will demonstrate how these measurements can be compared to Lattice QCD and phenomenological model predictions for the strong potentials between protons and multi-strange baryons. Using the measured proton-proton correlation function to constrain the size and shape of the baryon-emitting source, and the excellent precision of the ALICE data, we will demonstrate that our measurements are highly discriminating with respect to these predictions. The measured proton-${\mathrm{\Xi }}^{-}$ correlation function indicates the corresponding strong interaction is attractive, while the proton-${\mathrm{\Omega }}^{-}$ correlation function will be compared to models predicting a bound nucleon-${\mathrm{\Omega }}^{-}$ di-baryon state. A precise evaluation of these models of the nucleon-hyperon interaction is crucial for the modelling of the core of neutron stars. We will discuss the consequences of our measurements for the equation of state of neutron-rich matter including hyperons.

Presentation materials

SQM19_POSTER_pXi_pOmega_a0 (3).pdf