Measurement of charged jet production cross sections and nuclear modification in p–Pb collisions at √sNN=5.02 TeV

Adam, J. and Adamová, D. and Aggarwal, M.M. and Aglieri, Rinella G. and Agnello, M. and Agrawal, N. and Ahammed, Z. and Ahn, S.U. and Aimo, I. and Aiola, S. and Ajaz, M. and Akindinov, A. and Alam, S.N. and Aleksandrov, D. and Alessandro, B. and Alexandre, D. and Alfaro, Molina R. and Alici, A. and Alkin, A. and Alme, J. and Alt, T. and Altinpinar, S. and Altsybeev, I. and Alves, Garcia Prado C. and Andrei, C. and Andronic, A. and Anguelov, V. and Anielski, J. and Antičić, T. and Antinori, F. and Barnaföldi, Gergely Gábor and Lévai, Péter and Oláh, László (2015) Measurement of charged jet production cross sections and nuclear modification in p–Pb collisions at √sNN=5.02 TeV. PHYSICS LETTERS B, 749. pp. 68-81. ISSN 0370-2693

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Abstract

Charged jet production cross sections in p–Pb collisions at √ sNN = 5.02 TeV measured with the ALICE detector at the LHC are presented. Using the anti-kT algorithm, jets have been reconstructed in the central rapidity region from charged particles with resolution parameters R = 0.2 and R = 0.4. The reconstructed jets have been corrected for detector effects and the underlying event background. To calculate the nuclear modification factor, RpPb, of charged jets in p–Pb collisions, a pp reference was constructed by scaling previously measured charged jet spectra at √ s = 7 TeV. In the transverse momentum range 20 ≤ pT, ch jet ≤ 120 GeV/c, RpPb is found to be consistent with unity, indicating the absence of strong nuclear matter effects on jet production. Major modifications to the radial jet structure are probed via the ratio of jet production cross sections reconstructed with the two different resolution parameters. This ratio is found to be similar to the measurement in pp collisions at √ s = 7 TeV and to the expectations from PYTHIA pp simulations and NLO pQCD calculations at √ sNN = 5.02 TeV.

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