München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster

HK 54.5: Poster

Thursday, March 21, 2019, 16:30–19:00, Foyer Theresanium

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

In the quest of understanding heavy neutron stars the equation of state for dense fermionic systems is investigated under the hypothesis of hyperons as additional degrees of freedom. A necessary condition to allow for a systematic exploration of this ansatz is an in depth understanding of the Hyperon-Nucleon interaction. In reality, however, for the majority of hyperons experimental constraints of the interaction are scarce. Complementing the canonical methods of studying these interactions via means of hypernuclei decays and scattering data, femtoscopy could allow to probe some interactions for the very first time.

As a first step, the production of the Σ⁰ baryon at an unprecedented energy of √s = 13 TeV in minimum bias and high multiplicity triggered pp collisions is measured. 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 albeit sharing the quark content differ in isospin.

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