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Search for jet quenching effects in high-multiplicity proton-proton collisions at root s = 13TeV
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SYSNO ASEP 0546394 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Search for jet quenching effects in high-multiplicity proton-proton collisions at root s = 13TeV Author(s) Křížek, Filip (UJF-V) RID, ORCID, SAI Number of authors 1 Article number 156 Source Title Proceedings of Science, 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, 387. - Trieste : Sissa Medialab Srl, 2021 - ISSN 1824-8039 Number of pages 5 s. Publication form Online - E Action 10th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (HardProbes 2020) Event date 01.06.2020 - 06.06.2020 VEvent location Austin Country US - United States Event type WRD Language eng - English Country IT - Italy Keywords ALICE collaboration ; charged particle multiplicities Subject RIV BG - Nuclear, Atomic and Molecular Physics, Colliders OECD category Nuclear physics R&D Projects LTT17018 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Research Infrastructure CERN-CZ II - 90104 - Fyzikální ústav AV ČR, v. v. i. Institutional support UJF-V - RVO:61389005 EID SCOPUS 85116031321 DOI 10.22323/1.387.0156 Annotation The ALICE Collaboration reports results of a novel approach to jet-quenching measurements in high-multiplicity pp collisions at roots = 13 TeV, searching for broadening of the acoplanarity distribution measured by the semi-inclusive distribution of jets recoiling from a high-pT hadron. Charged-particle jet reconstruction is carried out using the anti-kT algorithm with R = 0.4. A data-driven statistical method is used to correct the recoil jet yield for uncorrelated background, including multi-partonic interactions. High-multiplicity (HM) pp events are selected based on charged-particle multiplicity registered in forward scintillator detectors, and their acoplanarity distributions are compared to those for Minimum Bias (MB) events. Significant broadening is observed in the acoplanarity distribution of HM events, consistent with jet quenching. However, qualitatively similar features are also seen in a simulated population of pp collisions generated by PYTHIA 8 Monash, which does not incorporate jet quenching. We utilize these PYTHIA simulations to explore the origin of the observed effect. The PYTHIA simulations suggest that the enhanced acoplanarity results from the bias induced by the HM selection towards multi-jet final states. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2022
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