Differential Cross Section Measurement of Drell-Yan Production and associated Jets with the CMS Experiment at the LHC

Using the "Rivet" and "Professor" framework, we construct a new PYTHIA 6 tuneusing the CTEQ6L1 PDF and two new PYTHIA 8 UE tunes (one using CTEQ6L1¯and one using the HERAPDF1.5LO). By simultaneously fitting CDF data from ppcollisions at 300 GeV, 900 GeV, and 1.96 TeV together with CMS data for pp collisionsat 7 TeV, we test the Underlying Event (UE) models and constrain their parameters,allowing for more precise predictions at 13 TeV and 14 TeV. The consistency of thesenew tunes with measurements of double-parton scattering (DPS) is also investigated.