Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 38: Hadron Structure and Spectroscopy VII

HK 38.3: Talk

Wednesday, February 28, 2018, 17:15–17:30, HZO 80

Femtoscopic studies of baryonic interactions with the ALICE detector — •Bernhard Hohlweger for the ALICE collaboration — Technische Universität München — Excellence Cluster Universe

The two body interaction of baryons with one partner containing strangeness is not well constrained, especially in the region of low momentum. Therefore data is usually obtained by conducting scattering experiments but recently a new method was proposed using femtoscopy. Here the observable is the correlation function of particle pairs, whereas in order to study the interaction of particles, the emission of the pairs needs to be constrained. In this analysis pp and pPb data recorded by the ALICE detector was used to study the proton-Λ interaction and Λ-Λ interaction. The source was constrained by simultaneously fitting the proton-proton correlation function, where the interaction of pairs is well understood. The formalism of λ-parameters was used to separate background contributions from the genuine correlation arising from the baryon-baryon interaction. The results are used to discuss the sensitivity to different potentials of the proton-Λ interaction obtained by LO and NLO calculations. Additionally a comparison of the Λ-Λ correlation to a previous measurement of the STAR collaboration is presented.