Event activity-dependence of jet production in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV measured with semi-inclusive hadron+jet correlations by ALICE

We report measurement of the semi-inclusive distribution of charged-particle jets recoiling from a high transverse momentum ( pT ) hadron trigger, for p–Pb collisions at sNN=5.02 TeV , in p–Pb classified by event activity. This observable has been measured in pp and Pb–Pb collisions at the LHC, providing a new probe to measure quenching. Jets are reconstructed from charged particle tracks using anti- kt with R=0.4 and low IR cutoff of jet constituents ( pT,track>0.15 GeV/c ). The complex uncorrelated jet background is corrected by a data-driven approach. Recoil jet distributions are reported for 15<pT,jetch<50 GeV/c . Events are classified by signal in the ALICE V0A detector, which measures forward multiplicity, and ZNA, which measures the number of neutrons at zero degrees. This self-normalized observable does not require scaling of reference distributions by 〈TpA〉 , thereby avoiding the need for geometric modeling. We compare the trigger-normalized recoil jet yield for p–Pb collisions with different event activity to measure the effects of jet quenching in small systems at the LHC.