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The ALICE Collaboration reports the measurement of semi-inclusivedistributions of charged-particle jets recoiling from a high transversemomentum (high $p_{\rm T}$) hadron trigger in proton$-$proton and centralPb$-$Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV. A data-driven statisticalmethod is used to mitigate the large uncorrelated background in central Pb$-$Pbcollisions. Recoil jet distributions are reported for jet resolution parameter$R=0.2$, 0.4, and 0.5 in the range $7 < p_{\rm T,jet} < 140$ GeV$/c$ andtrigger$-$recoil jet azimuthal separation $\pi/2 < \Delta\varphi < \pi$. Themeasurements exhibit a marked medium-induced jet yield enhancement at low$p_{\rm T}$ and at large azimuthal deviation from $\Delta\varphi\sim\pi$. Theenhancement is characterized by its dependence on $\Delta\varphi$, which has aslope that differs from zero by 4.7$\sigma$. Comparisons to model calculationsincorporating different formulations of jet quenching are reported. Thesecomparisons indicate that the observed yield enhancement arises from theresponse of the QGP medium to jet propagation.

Observation of medium-induced yield enhancement and acoplanarity  broadening of low-$p_\mathrm{T}$ jets from measurements in pp and central  Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV