Measurement of the W + jets differential cross-sections in pp collisions at √s = 1.96 TeV using the CDF II Detector

In this thesis the measurements of differential cross sections for the production of the W-boson in association with jets in proton-anti-proton collisions at √s = 1.96 TeV are presented. The measurements are based on 9.0/fb of CDF Run II data (i.e., the full dataset). Only events in which the W-boson decays leptonically (i.e., W→eν and W→μν) and at least one jet is present are considered. The leptons candidates are required to have a transverse energy greater than 25 GeV and pseudorapidity in the range |η| < 1 whereas, the reconstructed jets must have transverse energy grater than 25 GeV and pseudorapidity in the range |η| < 2. The reconstructed W-boson transverse mass should be grater than 40 GeV/c2. The differential cross sections as a function of the jet multiplicity (N ≥ 1, 2, 3, 4) and the leading jet transverse energy, are measured separately for each decay channel and then combined. For a meaningful comparison with theory the measured cross-sections are unfolded to remove detector effects. The resulting particle-level cross-sections are compared to theoretical predictions.