Measurement of inclusive jet production in Au+Au collisions at $\sqrt{s_\textrm{NN}}$ = 200 GeV by the STAR experiment

TL;DR

This paper reports measurements of inclusive jet production in gold-gold collisions at 200 GeV, revealing jet suppression in central collisions consistent with energy loss in the quark-gluon plasma, with no significant jet broadening observed.

Contribution

First measurement of inclusive jet production in Au+Au collisions at 200 GeV using multiple jet algorithms and parameters, providing new insights into jet quenching at RHIC energies.

Findings

Jet yield suppression observed in central collisions.

Suppression magnitude similar to LHC measurements.

No significant jet broadening detected.

Abstract

The STAR Collaboration reports the measurement of inclusive jet production in central (0-10%) and peripheral (60-80%) Au+Au collisions at $\sqrt{s_\textrm{NN}}$ = 200 GeV, using both charged-particle and fully-reconstructed jets. Jet reconstruction is carried out using the anti-$k_\textrm{T}$ algorithm with resolution parameters $R$ = 0.2, 0.3 and 0.4. Yield suppression of charged-particle jets is observed for central Au+Au collisions relative to both peripheral Au+Au collisions and a vacuum baseline utilizing PYTHIA 6 simulations. The magnitude of the suppression is similar to that measured at the LHC and can be described by theoretical calculations. No evidence of significant medium-induced jet broadening is observed, based on comparison of jet spectra at varying $R$. The yield suppression, when expressed as the jet transverse momentum shift corresponding to energy loss, is consistent in magnitude with coincidence measurements at RHIC based on direct-photon and hadron triggers. There is an indication of larger energy loss observed at the LHC.