Correlation Measurements of Charged Particles and Jets at Mid-Rapidity with Event Activity at Backward-Rapidity in $\sqrt{s_{\mathrm{NN}}}=200\mathrm{GeV}$ $p$+Au Collisions at STAR

Abstract

Semi-inclusive charged jet spectra per trigger at STAR are presented binned by event activity (EA) as determined by the Beam Beam Counter (BBC) signal in the Au-going direction. The selected EA determination is motivated by correlations between the number of charged tracks in the Time Projection Chamber (TPC) ($|\eta |<1$) and EA (${\eta }_{\mathrm{EA}}\in [-5,-2]$) which are also presented. The jet spectra per trigger at high EA are suppressed relative to the spectra at low EA. A PYTHIA investigation refutes that the suppression results from a trivial autocorrelation between jet kinematics and the acceptance of the EA and the TPC.

Proceedings for Quark Matter 2019 from Small Systems Parallel Session

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