Speaker
Joern Putschke
(Wayne State University)
Description
The measurement of fully reconstructed jets in heavy ion collisions
provides unique probes of the Quark-Gluon Plasma (QGP). However, full
jet reconstruction in such events is challenging due to a large
population of combinatorial background "jets" that overwhelm the true
hard jet population by several orders of magnitude. In order to carry
out accurate, data-driven jet measurements over a broad kinematic range
at RHIC energies, we developed a novel mixed-event technique that
describes the combinatorial jet background over several orders of
magnitude with high precision. We apply this technique to measure the
semi-inclusive charged jet distribution recoiling from a high $p_{T}$
hadron trigger in central Au+Au collisions at $\sqrt{s_{NN}}=$200 GeV.
We report the recoil jet distribution for various trigger $p_{T}$ ranges
and jet radii, and study the azimuthal distribution between the recoil
jet and trigger hadron. In addition we present the first measurement at
RHIC of the di-jet transverse momentum asymmetry, $A_J$. Both
measurements are performed with a very low infrared cutoff on jet
constituents of 200 MeV. These jet coincidence measurements allow a
direct comparison of jet quenching at RHIC and the LHC.
| On behalf of collaboration: | STAR |
|---|
Primary author
Joern Putschke
(Wayne State University)
