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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Heavy-Ion Collisions and QCD Phases VIII

HK 36.2: Vortrag

Mittwoch, 30. März 2022, 14:30–14:45, HK-H2

Charged-particle production in pp collisions at √s = 900 GeV with LHC Run 3 ALICE data — •Peter Stratmann for the ALICE collaboration — Westfälische Wilhelms-Universität Münster, Germany

The ALICE experiment at the Large Hadron Collider (LHC) is designed to investigate properties of the quark-gluon plasma (QGP) created in high-energy heavy-ion collisions. Medium effects can be investigated by comparing to the charged-particle production in pp collisions, where no QGP is expected. In the upcoming LHC Run 3, the ALICE collaboration prepares to collect Pb–Pb data at unprecedented peak-collision rates of about 50 kHz. To accomplish this, the main tracking detectors underwent fundamental upgrades and a brand new reconstruction and analysis framework was developed.

In this talk, we present one of the first measurements performed with these new detectors and software. We investigate the bulk particle production in pp collisions at √s = 900  GeV observed in data taken during a five day pilot beam in the end of October 2021. We discuss the tracking performance and show the correlation of p_T spectra with multiplicity for inclusive charged particles obtained with a 2d unfolding procedure that was already used in a comprehensive analysis of Run 1 and Run 2 data. These first results are compared to minimum bias spectra of inclusive charged particles at the same energy, which were among the first measurements when ALICE started taking data.

Supported by BMBF within the ERuM framework and the Helmholtz Association.