Speaker
Description
We present predictions from a pQCD-based energy-loss formalism for the leading high-$p_T$ hadron observables $R_{AB}, v_2,v_3$ and $v_4$ in the small systems of pPb, dAu, OO, and NeNe. The energy-loss model is particularly well suited for the study of small systems as the formalism incorporates event-by-event hydrodynamic evolution of the medium's scattering centers, includes short path-length corrections, and consistently enforces the large formation-time approximation. The model's parameters are constrained to large-system $R_{AA}$ and $v_n$ data from RHIC and the LHC; we find that the extracted values of $\alpha_s\approx0.27$ and $\hat{q}/T^3\approx5.5$ can simultaneously describe high-$p_T$ $R_{AA},v_2$, and $v_4$ data, although a significant tension arises in the description of high-$p_T$ $v_3$. From the constrained model, we make the novel prediction that the high-pT charged hadron $R_{AB}$ is less than unity, but for all centrality classes there is no measurable $v_{2}\{SP\}$ anisotropy in pPb, dAu, OO, and NeNe collision systems; the lack of anisotropy arises as the orientation of the participant plane defined by hard particles and the participant plane defined by soft particles becomes decorrelated in these small systems.
| Is this an experimental talk? | No |
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| Is this on behalf of a collaboration? | No |
| Are you willing to present as a poster if it is not selected for oral presentation? | Yes |