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We report measurement of the semi-inclusive distribution of charged-particlejets recoiling from a high transverse momentum ($p_{\rm T}$) hadron trigger,for p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV, in p-Pb eventsclassified by event activity. This observable has been measured in pp and Pb-Pbcollisions at the LHC, providing a new probe to measure quenching. Jets arereconstructed from charged particle tracks using anti-$k_{\rm t}$ with $R =0.4$ and low IR cutoff of jet constituents ($p_{\rm T,track} > 0.15$ GeV/$c$).The complex uncorrelated jet background is corrected by a data-driven approach.Recoil jet distributions are reported for $15 < p_{\rm T,jet}^{\rm ch} < 50$GeV/$c$. Events are classified by signal in the ALICE V0A detector, whichmeasures forward multiplicity, and ZNA, which measures the number of neutronsat zero degrees. This self-normalized observable does not require scaling ofreference distributions by $T_{\rm pA}$ , thereby avoiding the need forgeometric modeling. We compare the trigger-normalized recoil jet yield for p-Pbcollisions with different event activity to measure the effects of jetquenching in small systems at the LHC.

nuclear physics a

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