Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 17: Heavy Ion Collision and QCD Phases IV

HK 17.3: Talk

Tuesday, March 15, 2016, 14:45–15:00, S1/01 A01

Production of strange hadrons in charged jets in Pb–Pb collisions measured with ALICE at the LHC — •Alice Zimmermann for the ALICE collaboration — Physikalisches Institut, Universität Heidelberg

Studies of jet production characterize the properties of the hot and dense strongly interacting matter created in ultra-relativistic heavy-ion collisions. Specifically, measurements of strange hadrons in jets may clarify the role of fragmentation processes in the anomalous baryon to meson ratio at intermediate particle p_T, firstly observed in A-A collisions at RHIC and later confirmed in lead-lead (Pb–Pb) collisions at the LHC. Surprisingly, also measurements in proton-lead (p–Pb) collisions at the LHC showed this anomaly, although to a lesser extent.

In this contribution, we present measurements of the p_T spectra of Λ(Λ) baryons and K_S⁰ mesons produced in association with charged jets in Pb–Pb collisions at √s_NN=2.76 TeV. The analysis is based on data recorded by ALICE at the LHC, exploiting its excellent particle identification capabilities. The baryon to meson ratios of strange particles associated with jets are studied in the 10 % most central events. A comparison is shown to the ratios obtained for inclusive particle production and for particles stemming from the underlying event as well as to PYTHIA proton-proton (pp) simulations. It is furthermore compared to the results obtained from charged jets in p–Pb collisions at √s_NN=5.02 TeV.