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

• Main Author: Taylor, Frank E. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2014-02-10T17:50:30Z.
• Subjects: Article
• Online Access: Get fulltext

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.
United States. Dept. of Energy
National Science Foundation (U.S.)
Brookhaven National Laboratory