6533b7cffe1ef96bd12587eb

RESEARCH PRODUCT

Measurement of jet suppression in central Pb–Pb collisions at √sNN = 2.76 TeV

Alice Collaboration

subject

Pb–Pb collisionsAstrophysics::High Energy Astrophysical PhenomenaHigh Energy Physics::Experimentjet suppressionjet spectraNuclear Experiment

description

The transverse momentum (pT) spectrum and nuclear modification factor (RAA) of reconstructed jets in 0–10% and 10–30% central Pb–Pb collisions at √sNN = 2.76 TeV were measured. Jets were reconstructed using the anti-kT jet algorithm with a resolution parameter of R = 0.2 from charged and neutral particles, utilizing the ALICE tracking detectors and Electromagnetic Calorimeter (EMCal). The jet pT spectra are reported in the pseudorapidity interval of |ηjet| 5 GeV/c to suppress jets constructed from the combinatorial background in Pb–Pb collisions. The leading charged particle requirement applied to jet spectra both in pp and Pb– Pb collisions had a negligible effect on the RAA. The nuclear modification factor RAA was found to be 0.28 ± 0.04 in 0–10% and 0.35 ± 0.04 in 10–30% collisions, independent of pT, jet within the uncertainties of the measurement. The observed suppression is in fair agreement with expectations from two model calculations with different approaches to jet quenching. peerReviewed

yearjournalcountryeditionlanguage
2015-01-01
http://urn.fi/URN:NBN:fi:jyu-201507072544