Measurement of jet suppression in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV - INSPIRE

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Measurement of jet suppression in central Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV

ALICE

Collaboration

Feb 5, 2015

14 pages

Published in:

Phys.Lett.B 746 (2015) 1-14

Published: Apr 22, 2015

e-Print:

1502.01689 [nucl-ex]

DOI:

10.1016/j.physletb.2015.04.039

Report number:

CERN-PH-EP-2015-023

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Elsevier)

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|<0.5 for 405 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.

Note:

27 pages, 5 captioned figures, 1 table, authors from page 21, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1197

heavy ion: scattering
lead
jet: quenching
track data analysis: jet
calorimeter: electromagnetic
model: Glauber
p p: scattering
charged particle
leading particle
transverse momentum: momentum spectrum

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