München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Heavy-Ion Collisions and QCD Phases III

HK 19.4: Vortrag

Dienstag, 19. März 2019, 15:00–15:15, HS 15

Anti-helium production in pp collisions mesured with ALICE — Michael Habib and •Alberto Caliva for the ALICE collaboration — GSI, Planckstraße 1, 64291 Darmstadt

Cosmic-ray anti-helium (He) have been long suggested as dark matter probe, since their production from collisions of high-energetic cosmic-rays with the interstellar medium seems to be extremely rare. However, due to the lack of He measurements at comparable energies and system sizes, the astrophysical background is still poorly known.

ALICE has collected ∼ 1.5 billion pp events at a center-of-mass energy of √s = 13 TeV. This constitutes a sufficient sample to measure the rare processes of anti- ³ He production and contribute to a more precise estimate of the astrophysical background.

In this talk, we present the transverse-momentum ( p_T ) spectra of (anti-) ³ He in pp collisions and the corresponding coalescence parameter ( B₃ ) for different event multiplicities.