Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in Pb + Pb Collisions at √s[subscript NN] = 2.76 TeV with the ATLAS Detector
Author(s)Taylor, Frank E.
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Measurements of the variation of inclusive jet suppression as a function of relative azimuthal angle, Δϕ, with respect to the elliptic event plane provide insight into the path-length dependence of jet quenching. ATLAS has measured the Δϕ dependence of jet yields in 0.14 nb[superscript −1] of √s[subscript NN] = 2.76 TeV Pb + Pb collisions at the LHC for jet transverse momenta p[subscript T] > 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 Δϕ was characterized by the parameter, v[jet over 2], and the ratio of out-of-plane (Δϕ ~ π/2) to in-plane (Δϕ ~ 0) yields. Nonzero v[jet over 2] values were measured in all centrality bins for p[subscript T] < 160 GeV. The jet yields are observed to vary by as much as 20% between in-plane and out-of-plane directions.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review Letters
American Physical Society
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, et al. “Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in Pb + Pb Collisions at √s[subscript NN] = 2.76 TeV with the ATLAS Detector.” Physical Review Letters 111, no. 15 (October 2013). © 2013 CERN, for the ATLAS Collaboration
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