Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Structure and Dynamics of Nuclei XI

HK 60.4: Talk

Friday, April 3, 2020, 12:15–12:30, J-HS H

Experimental measurements of total inelastic cross sections of light anti-nuclei up to anti-Helium 3 in ALICE — •Stephan Koenigstorfer, Ivan Vorobyev, and Laura Fabbietti for the ALICE collaboration — Technische Universität München, Physik Department E62

Recent work by the ALICE Collaboration presented the first experimental measurement of the total inelastic cross section for anti-deuterons at low momenta between 0.5GeV/c and 4GeV/c, as well as new measurements of the total inelastic cross section for anti-protons at momenta between 0.3GeV/c and 4GeV/c, in p-Pb collisions. These measurements offer unprecedented constraints on the propagation of light anti-nuclei through matter. In particular, light anti-nuclei from dark matter decays can be separated from secondary anti-nuclei produced in high energy cosmic ray collisions only if their propagation through the interstellar medium can be accurately simulated.

In this contribution we present the studies of the total inelastic cross section of light anti-nuclei in ALICE. They are extended to high multiplicity triggered p-p collisions at √s = 13TeV, and from p and d to anti-Helium 3. The cross sections are extracted by measuring the difference in propagation between particles and anti-particles, and comparing it to Monte Carlo simulations.