Speaker
Description
We take a closer look at the single particle nuclear modification factor ($R_{AA}$) and azimuthal anisotropy ($v_{2}$) of leading hadrons at high transverse momentum ($p_{T}$) at both RHIC and LHC collision energies. We focus on the established reduction in the interaction measure $\hat{q}/T^{3}$ between RHIC and LHC, as discovered by the JET collaboration. The centrality dependence of the $R_{AA}$ and $v_{2}$ at both these collision energies strongly suggests that the reduction is not caused by a temperature dependence in the ratio of $\hat{q}/T^{3}$ but rather by an energy dependence of $\hat{q}$.
We study this dependence by introducing an $x$ dependence in the distribution function that is integrated to obtain $\hat{q}$. We conjecture on possible forms of a scale dependence by relating $\hat{q}$ to an object similar to a transverse momentum dependent parton distribution function (TMDPDF). The ensuing operator product is then related to quantities that may be estimated in lattice QCD.
| Presentation type | Oral |
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