Constraints on jet quenching in p-Pb collisions at √sNN = 5.02 TeV measured by the event-activity dependence of semi-inclusive hadron-jet distributions
| Autor: | Acharya, S., Antičić, Tome, Erhardt, Filip, Gotovac, Sven, Jerčić, Marko, Lončar, Petra, Mudnić, Eugen, Planinić, Mirko, Poljak, Nikola, Simatović, Goran, Utrobičić, Antonija, Vicković, Linda, Zou, S. |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Astrophysics::High Energy Astrophysical Phenomena
High Energy Physics::Experiment Nuclear Experiment jet: quenching charged particle: jet jet: transverse momentum jet: background jet: recoil jet: yield charged particle: multiplicity charged particle: tracks hadron: trigger heavy ion: scattering semi-inclusive reaction CERN LHC Coll Brookhaven RHIC Coll statistical resolution geometry ALICE |
| Popis: | The ALICE Collaboration reports the measurement of semi- inclusive distributions of charged-particle jets recoiling from a high-transverse momentum trigger hadron in p–Pb collisions at sNN=5.02 TeV. Jets are reconstructed from charged-particle tracks using the anti- kT algorithm with resolution parameter R=0.2 and 0.4. A data-driven statistical approach is used to correct the uncorrelated background jet yield. Recoil jet distributions are reported for jet transverse momentum pT, jetchGeV/c and are compared in various intervals of p–Pb event activity, based on charged-particle multiplicity and zero-degree neutral energy in the forward (Pb-going) direction. The semi- inclusive observable is self-normalized and such comparisons do not require the interpretation of p–Pb event activity in terms of collision geometry, in contrast to inclusive jet observables. These measurements provide new constraints on the magnitude of jet quenching in small systems at the LHC. In p–Pb collisions with high event activity, the average medium-induced out-of-cone energy transport for jets with R=0.4 and pT, jetch GeV/c is measured to be less than 0.4 GeV/c at 90% confidence, which is over an order of magnitude smaller than a similar measurement for central Pb–Pb collisions at sNN=2.76TeV . Comparison is made to theoretical calculations of jet quenching in small systems, and to inclusive jet measurements in p–Pb collisions selected by event activity at the LHC and in d–Au collisions at RHIC. |
| Databáze: | OpenAIRE |
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