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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Heavy Ion Collisions and QCD Phases IV

HK 20.2: Talk

Tuesday, March 28, 2017, 14:30–14:45, F 1

Measurement of Identified Hadron Production in Charged Jets from Proton-Lead Collisions with ALICE at the LHC — •Martin Schmidt for the ALICE collaboration — Physikalisches Institut, Universität Tübingen

The spectra of identified hadrons in jets offer possibilities to investigate the fragmentation of partons in detail. By comparing the results for proton-proton (pp) and proton-lead (p-Pb) collisions we can test hypotheses about cold nuclear matter effects.

The ALICE experiment at the LHC has excellent particle identification capabilities for tracks with transverse momentum ranging from 150 MeV/c to above 20 GeV/c. It therefore can measure identified hadrons in a way that is unique at the LHC.

In p-Pb collisions the underlying event, coming from soft interactions, cannot be neglected and spoils the jet measurements. We present methods to measure the individual contributions of π/K/p to the underlying event and discuss how to properly subtract it from the particle production inside the jet area. The study of the underlying event in p-Pb collisions also serves as a proof of principle to adapt the methods later on for lead-lead (Pb-Pb) collisions where the underlying event is huge.

We show the corrected jet constituent spectra from p-Pb collisions with systematic uncertainties as a function of pTtrack,charged and z=pTtrack, charged/pTjet, charged.

Work supported by grant BMBF-05P15VTCA1.

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