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Aug 9, 2022, 2:00 PM
Oral report 重离子物理 Parallel Session I (3):Heavy Ion Physics


Yaxian Mao (Central China Normal University)


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 $R$.

Primary author

Yaxian Mao (Central China Normal University)

Presentation materials