Measurement of the jet radius and transverse momentum dependence of inclusive jet suppression in lead-lead collisions at √sNN = 2.76 TeV with the ATLAS detector

Aad, G. and Abbott, B. and Abdallah, J. and Khalek, S. A. and Abdelalim, A. A. and Abdinov, O. and Abi, B. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Acerbi, E. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adragna, R. and Adye, T. and Aefsky, S. and Aguilar-Saavedra, J. A. and Agustoni, M. and Aharrouche, M. and Ahlen, S. P. and Ahles, F. and Ahmad, A. and Ahsan, M. and Aielli, G. and Akdogan, T. and Krasznahorkay, Attila and Pásztor, Gabriella and Tóth, József (2013) Measurement of the jet radius and transverse momentum dependence of inclusive jet suppression in lead-lead collisions at √sNN = 2.76 TeV with the ATLAS detector. PHYSICS LETTERS B, 719 (4-5). pp. 220-241. ISSN 0370-2693

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Abstract

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sen- sitivity to the physics of jet quenching. In a sample of lead-lead collisions at √sNN = 2.76 TeV cor- responding to an integrated luminosity of approximately 7 μb−1, ATLAS has measured jets with a calorimeter system over the pseudorapidity interval |η| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet “central-to-peripheral ratio,” RCP. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. RCP varies smoothly with centrality as characterized by the number of par- ticipating nucleons. The observed suppression is only weakly dependent on transverse momentum. A significant dependence of the RCP on the jet radius is observed for jets with pT < 100 GeV. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.

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