München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Heavy-Ion Collisions and QCD Phases X
HK 58.4: Talk
Friday, March 22, 2019, 15:00–15:15, HS 15
Net-Λ fluctuations in Pb-Pb collisions at ALICE at the LHC — •Alice Ohlson for the ALICE collaboration — Physikalisches Institut, Universität Heidelberg
The fluctuations of conserved charges – such as electric charge, strangeness, and baryon number – in ultrarelativistic heavy-ion collisions provide insight into the properties of the quark-gluon plasma and the QCD phase diagram. They can be related to the higher moments of the multiplicity distributions of identified particles such as pions, kaons, and protons. The Λ baryon carries both strangeness and baryon number and is thus of particular interest. We present the first measurement of net-Λ fluctuations in Pb–Pb collisions at √sNN = 5.02 TeV with the ALICE detector. The results are obtained with the Identity Method, which is applied in a novel way to account for the combinatoric background in the invariant mass distribution. The second moments of the net-Λ multiplicity distribution as a function of centrality and pseudorapidity acceptance are compared with the net-proton and net-kaon results measured by ALICE, as well as with model calculations.
Supported by BMBF and the Alexander von Humboldt Foundation.