中国物理学会高能物理分会第十一届全国会员代表大会暨学术年会

The energy loss of jets (jet quenching) is one of the most important signatures of the deconfined state of quarks and gluons (Quark-Gluon Plasma) created in Pb--Pb collisions at the LHC. The measurement of jets recoiling from a trigger hadron uniquely enables the exploration of medium-induced modification of jet production. Jet deflection via multiple soft scatterings with the medium constituents may result in a broadening of the overall azimuthal correlation between the trigger hadron and the recoiling jet. In addition, the tail of this azimuthal correlation is sensitive to single-hard Moli\`ere scatterings off quasi-particles in the medium. The overall yield and R-dependence of the recoil jets of also offers important information about jet energy loss and intra-jet broadening. This contribution presents a measurement of charged jets recoiling from a trigger hadron in pp and Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. Techniques are employed which allow for a precise data-driven subtraction of the large uncorrelated background contaminating the measurement in Pb--Pb collisions, enabling the exploration of medium-induced modification of jet production and acoplanarity over a wide phase space, including the low jet $p_\mathrm{T}$ region for large jet resolution parameter $R$.