"Azimuthal decorrelation as a probe to QCD matter"
Azimuthal decorrelation in boson-jet and dijet events is an important observable in both proton-proton collisions and high-energy nuclear collisions. In proton-proton collisions, precise predictions of azimuthal decorrelation rely on both accurate fixed-order calculations and resummation of Sudakov logarithms in the back-to-back limit. In the first part of this talk, I will present our recent, most precise predictions of boson-jet azimuthal decorrelation in pp collisions, accomplished by using the Winner-Take-All jet axis. The second part of this talk will focus on resummation of both Sudakov logarithms, the same as those in pp collisions, and medium-dependent logarithms in the transverse-momentum distribution of jets produced in deep-inelastic scattering on a large nucleus, which is closely related to azimuthal decorrelation.