Measurement of the Azimuthal Angle Dependence of Inclusive Jet Yields in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Pb</mml:mi><mml:mo mathvariant="bold">+</mml:mo><mml:mi>Pb</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo mathvariant="bold">=</mml:mo><mml:mn>2.76</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:math>with the ATLAS Detector

Measurements of the variation of inclusive jet suppression as a function of relative azimuthal angle, $\ensuremath{\Delta}\ensuremath{\phi}$, with respect to the elliptic event plane provide insight into the path-length dependence of jet quenching. ATLAS has measured the $\ensuremath{\Delta}\ensuremath{\phi}$ dependence of jet yields in $0.14\text{ }\text{ }{\mathrm{nb}}^{\ensuremath{-}1}$ of $\sqrt{{s}_{NN}}=2.76\text{ }\text{ }\mathrm{TeV}$ $\mathrm{Pb}+\mathrm{Pb}$ collisions at the LHC for jet transverse momenta ${p}_{T}>45\text{ }\text{ }\mathrm{GeV}$ in different collision centrality bins using an underlying event subtraction procedure that accounts for elliptic flow. The variation of the jet yield with $\ensuremath{\Delta}\ensuremath{\phi}$ was characterized by the parameter, ${v}_{2}^{\mathrm{jet}}$, and the ratio of out-of-plane ($\ensuremath{\Delta}\ensuremath{\phi}\ensuremath{\sim}\ensuremath{\pi}/2$) to in-plane ($\ensuremath{\Delta}\ensuremath{\phi}\ensuremath{\sim}0$) yields. Nonzero ${v}_{2}^{\mathrm{jet}}$ values were measured in all centrality bins for ${p}_{T}<160\text{ }\text{ }\mathrm{GeV}$. The jet yields are observed to vary by as much as 20% between in-plane and out-of-plane directions.

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