Measurement of the underlying event in the Drell–Yan process in proton–proton collisions at √ s =7 TeV
Measurement of the underlying event in the Drell–Yan process in proton–proton collisions at √ s =7 TeV
A measurement of the underlying event (UE) activity in proton–proton collisions at a center-of-mass energy of 7 TeV is performed using Drell–Yan events in a data sample corresponding to an integrated luminosity of 2.2 fb−1, collected by the CMS experiment at the LHC. The activity measured in the muonic final state (qq → μ + μ −) is corrected to the particle level and compared with the predictions of various Monte Carlo generators and hadronization models. The dependence of the UE activity on the