Measurement of the Rapidity and Transverse Momentum Distributions of Z Bosons in pp Collisions at sqrt(s)=7 TeV

TL;DR

This paper reports measurements of Z boson rapidity and transverse momentum distributions in proton-proton collisions at 7 TeV, comparing results with QCD predictions to test theoretical models and parton distribution functions.

Contribution

First measurement of Z boson rapidity and transverse momentum distributions at 7 TeV with detailed comparison to QCD models and PDFs.

Findings

Good agreement for rapidity distribution with models

No single model fully describes the transverse momentum distribution

Data provides constraints for QCD and parton distribution functions

Abstract

Measurements of the normalized rapidity (y) and transverse momentum (qT) distributions of Drell-Yan muon and electron pairs in the Z-boson mass region (60<M(ll)<120 GeV) are reported. The results are obtained using a data sample of proton-proton collisions at a center-of-mass energy of 7 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36 inverse picobarns. The distributions are measured over the ranges |y|<3.5 and qT<600 GeV and compared with QCD calculations using recent parton distribution functions. Overall agreement is observed between the models and data for the rapidity distribution, while no single model describes the Z transverse-momentum distribution over the full range.