Measurements of jet quenching via hadron+jet correlations in Pb-Pb and high-particle multiplicity pp collisions with ALICE

0557397 - ÚJF 2023 RIV IT eng C - Konferenční příspěvek (zahraniční konf.)
Kotliarov, Artem
Measurements of jet quenching via hadron+jet correlations in Pb-Pb and high-particle multiplicity pp collisions with ALICE.
Proceedings of Science. Vol. 398. Trieste: Sissa Medialab srl, 2022, č. článku 293. ISSN 1824-8039.
[The European Physical Society Conference on High Energy Physics (EPS-HEP 2021). online (DE), 26.07.2021-30.07.2021]
Grant CEP: GA MŠMT(CZ) LTT17018
Výzkumná infrastruktura: CERN-CZ II - 90104
Institucionální podpora: RVO:61389005
Klíčová slova: ALICE collaboration * p nucleus interactions * jet quenching
Obor OECD: Particles and field physics

Semi-inclusive measurements of hadron-jet acoplanarity are utilized to search for jet quenching effects in the 0-10% most central Pb-Pb collisions at vsNN = 5.02 TeV and the high-multiplicity pp collisions at vs = 13 TeV. In the Pb-Pb system, where quark-gluon plasma formation is established, a narrowing and suppression of the acoplanarity is observed relative to the PYTHIA-simulated pp reference. In contrast, the acoplanarity distributions that were measured in the high-multiplicity pp events exhibit a marked broadening and suppression with respect to the analogous distributions obtained from the minimum bias events. The observed features are, however, qualitatively reproduced by the PYTHIA 8 Monte Carlo event generator, which does not incorporate jet quenching. The PYTHIA simulations reveal that the observed suppression and broadening are the consequence of a bias induced by the ALICE high-multiplicity trigger, which increases the probability to observe a high-pT recoil jet in the acceptance of the forward trigger detectors and which biases toward multi-jet final states.
Trvalý link: http://hdl.handle.net/11104/0331431