Hard Probe of Soft Matter Geometry and Fluctuations from RHIC to LHC

TL;DR

This paper investigates how high-energy jets probe the geometry and fluctuations of soft matter in heavy ion collisions, revealing a model with strong near-Tc enhancement and less opacity at LHC, supported by data on harmonic responses and azimuthal correlations.

Contribution

It provides experimental evidence favoring the jet monography model with near-Tc enhancement and quantifies jet responses to multiple harmonic anisotropies in heavy ion collisions.

Findings

Supports jet monography model with near-Tc enhancement

Shows less opaque medium at LHC compared to RHIC

Quantifies jet responses to harmonic anisotropies

Abstract

We report results on event-by-event hard probe of soft matter geometry and fluctuations in heavy ion collisions. Geometric data ($v_2$ of high $p_t$ hadrons) from RHIC plus LHC clearly favors jet "monography" model with strong near-Tc enhancement of jet-medium interaction strength which also implies a less opaque medium at LHC. We also quantify the jet responses to all harmonic anisotropy $v_n$($n=1,2,3,4,5,6$) and their manifestation in hard-soft azimuthal correlations.