Measurements of the five most significant angular coefficients, A 0 through A 4 , for Z bosons produced in pp collisions at s=8 TeV and decaying to μ + μ − are presented as a function of the transverse momentum and rapidity of the Z boson. The integrated luminosity of the dataset collected with the CMS detector at the LHC corresponds to 19.7fb −1 . These measurements provide comprehensive information about the Z boson production mechanisms, and are compared to the QCD predictions at leading order, next-to-leading order, and next-to-next-to-leading order in perturbation theory.
Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., … Woods, N. (2015). Angular coefficients of Z bosons produced in pp collisions at s=8 TeV and decaying to μ + μ − as a function of transverse momentum and rapidity. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 750, 154–175. https://doi.org/10.1016/j.physletb.2015.08.061