Semi-inclusive jets recoiling from ${\gamma }_{dir}$ and ${\pi }^0$ triggers in central Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV in STAR

Abstract

We report the first measurement of fully corrected semi-inclusive charged recoil jets for both direct-photon (${\gamma }_{dir}$) and ${\pi }^0$ triggers, within two trigger transverse energy ranges between 9 GeV and 15 GeV, in central Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV using data with an integrated luminosity of 13 $\mathrm{n}{\mathrm{b}}^{-1}$ collected by the STAR experiment. A comparison between ${\pi }^0$-triggered recoil jets in p+p collisions and PYTHIA is discussed. A comparison is also presented between the suppression of ${\gamma }_{dir}$- and ${\pi }^0$-triggered recoil jets in central Au+Au collisions with respect to their corresponding PYTHIA references. A strong and similar level of suppression is observed in recoil-jet yields as a function of jet transverse momentum for ${\gamma }_{dir}$+jet and ${\pi }^0$+jet.

Comments: Hard Probes 2018, 6 figures