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Correlations of High-pT Hadrons and Jets in ALICE

by Filip Krizek on Behalf of the ALICE Collaboration
Department of Nuclear Spectroscopy, Nuclear Physics Institute of CAS, 25068 Husinec-Rez, Czech Republic
This paper is based on the talk at the 18th Zimányi School, Budapest, Hungary, 3–7 December 2018.
Universe 2019, 5(5), 124; https://doi.org/10.3390/universe5050124
Received: 21 March 2019 / Revised: 17 May 2019 / Accepted: 20 May 2019 / Published: 22 May 2019
(This article belongs to the Special Issue The Zimányi School and Analytic Hydrodynamics in High Energy Physics)
There are two prominent experimental signatures of quark–gluon plasma creation in ultra-relativistic heavy-ion collisions: the jet quenching phenomenon and the azimuthal-momentum space-anisotropy of final-state particle emission. Recently, the latter signature was also observed in lighter collision systems such as p–Pb or pp. This raises a natural question of whether in these systems, the observed collectivity is also accompanied by jet quenching. In this paper, we overview ALICE measurements of the jet quenching phenomenon studied using semi-inclusive distributions of track-based jets recoiling from a high-transverse momentum ( p T ) hadron trigger in Pb–Pb and p–Pb collisions at LHC energies. The constructed coincidence observable, the per trigger normalized yield of associated recoil jets, is corrected for the complex uncorrelated jet background, including multi-partonic interactions, using a data-driven statistical subtraction method. In the p–Pb data, the observable was measured in events with different underlying event activity and was utilized to set an upper limit on the average medium-induced out-of-cone energy transport for jets with resolution parameter R = 0.4 . The associated jet momentum shift was found to be less than 0.4 GeV/c at 90% confidence. View Full-Text
Keywords: jet quenching; QGP; event activity; small systems jet quenching; QGP; event activity; small systems
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Krizek, F., on Behalf of the ALICE Collaboration; Correlations of High-pT Hadrons and Jets in ALICE. Universe 2019, 5, 124.

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