Speaker
Description
In heavy-ion collisions, large transverse momentum partons traverse the colored medium and lose energy via induced gluon radiation and elastic scattering, which modify jet structure relative to jets produced in vacuum. The semi-inclusive recoil jet measurement provides precise, data-driven suppression of the large uncorrelated background and uniquely enables the exploration of medium-induced modification of jet production over wide phase space, including low$p_\mathrm{T}$ for large jet resolution parameter $R$. Such measurement in pp and p--Pb collisions provides a good test for pQCD calculations, and sets as a reference for jet quenching and acoplanarity study in nucleus-nucleus collisions.
In this contribution, we report the semi-inclusive distribution of charged jets recoiling from a high-$p_\mathrm{T}$ charged hadron trigger in pp collisions at $5.02 ~\mathrm{TeV}$, with emphasis on the region of low recoil jet $p_\mathrm{T}$ and large $R$. The semi-inclusive recoil jet distribution as a function of $p_\mathrm{T}$ and $\Delta\varphi$ will be presented, where $\Delta\varphi$ is the relative azimuthal angle between trigger track and recoil jets. The results, including the $R$-dependence, will be compared to models.
