中国物理学会高能物理分会第十三届全国粒子物理学术会议（2021）

The azimuthal decorrelation in vector boson+jet production due to soft and collinear QCD effects can be calculated to high precision by using recoil-free jet axes, such as the Winner-Takes-All (WTA) axis, alongside Soft-Collinear Effective Theory (SCET) methods. I present theoretical predictions at next-to-next-to-leading logarithmic accuracy for the azimuthal decorrelation, and demonstrate that this result is robust when using charged tracks instead of calorimetry, and in the presence of large backgrounds, due to the features of the WTA axis. We further find contributions to the process from linearly-polarised gluon transverse momentum distributions (arising from spin superposition effects of a single incoming or outgoing parton), in both the initial and final state.