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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster

HK 52.5: Poster

Donnerstag, 1. März 2018, 16:30–18:45, Audimax Foyer

Σ⁰ Baryon Production in pp Collisions at √s = 13 TeV measured with the ALICE experiment — •Andreas Mathis for the ALICE collaboration — TU München, Physik Department E62, Excellence Cluster ’Universe’, Garching

Even though it has been recently demonstrated that gravitational wave observations of binary neutron star mergers are a powerful tool to determine the neutron star equation of state (EOS), the latter still remains a puzzle. In particular, for the description of such a system in the presence of Hyperons a thorough understanding of the Hyperon-Nucleon interaction is mandatory. Recently much progress has been made for the case of the Λ-N interaction, by employing femtoscopy as a complementary method compared to scattering data. For other Hyperons, however, the knowledge of the interaction is rather poor. In particular, since Σ hypernuclei have not been observed so far and since also scattering data for Σ hyperon beams are scarce, the Σ -Nucleon interaction remains to be probed.

As a first step, we measure the production of the Σ⁰ baryon at an unprecedented energy of √s = 13 TeV in pp collisions. The Σ⁰ baryon is reconstructed via the decay Σ⁰→Λγ with subsequent decays Λ → pπ in coincidence with a dielectron pair stemming from photon conversions employing the unique capability of the ALICE detector to measure low energy photons. The yield of the Σ⁰ is compared to that of Λ baryons, which have the same quark content but different isospin.

This research was supported by the DFG cluster of excellence ’Origin and Structure of the Universe’ and the SFB 1258.