Speaker
Description
The measurement of jets recoiling from a trigger hadron provides unique probes of medium-induced modification of jet production. Jet deflection via multiple soft scatterings with the medium constituents may broaden the azimuthal correlation between the trigger hadron and the recoiling jets. The R-dependence of recoil jet yield probes jet energy loss and intra-jet broadening. The hadron+jet results may be sensitive to wake effects due to jet-medium energy transfer at low $p_\mathrm{T}$.
This talk presents measurements of the semi-inclusive distribution of charged-particle jets recoiling from a trigger hadron in pp and Pb-Pb collisions. We observed a marked medium-induced jet yield enhancement at low $p_\mathrm{T}$ and at large azimuthal deviation from $\delta \phi \sim \pi$ with large jet resolution parameter R. Comparisons to different model calculations incorporating different formulations of in-medium jet scattering and medium response are also reported.
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