Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in Pb+Pb Collisions at √sNN = 2.76 TeV with the ATLAS detector

Aad, G. and Abajyan, T. and Abbott, B. and Abdallah, J. and Khalek, S. A. and Abdinov, O. and Aben, R. and Abi, B. and Abolins, M. and AbouZeid, O. S. and Abramowicz, H. and Abreu, H. and Abulaiti, Y. and Acharya, B. S. and Adamczyk, L. and Adams, D. L. and Addy, T. N. and Adelman, J. and Adomeit, S. and Adye, T. and Aefsky, S. and Agatonovic-Jovin, T. and Aguilar-Saavedra, J. A. and Agustoni, M. and Ahlen, S. P. and Ahmad, A. and Ahsan, M. and Aielli, G. and Akesson, T. P. A. and Akimoto, G. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2013) Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in Pb+Pb Collisions at √sNN = 2.76 TeV with the ATLAS detector. PHYSICAL REVIEW LETTERS, 111 (15). ISSN 0031-9007

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Abstract

Measurements of the variation of inclusive jet suppression as a function of relative azimuthal angle, ∆φ, with respect to the elliptic event plane provide insight into the path-length dependence of jet quenching. ATLAS has measured the ∆φ dependence of jet yields in 0.14 nb−1 of √sNN = 2.76 TeV Pb+Pb collisions at the LHC for jet transverse momenta pT > 45 GeV in different collision centrality bins using an underlying event subtraction procedure that accounts for elliptic flow. The variation of the jet yield with ∆φ was characterized by the parameter, vjet 2 , and the ratio of out-of-plane (∆φ ∼ π/2) to in-plane (∆φ ∼ 0) yields. Non-zero vjet 2 values were measured in all centrality bins for pT < 160 GeV. The jet yields are observed to vary by as much as 20% between in-plane and out-of-plane directions.

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