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.
Highlights
The production of Z and W bosons, which may be identified through their leptonic decays, is theoretically well described within the framework of the standard model
The dominant uncertainties in the calculations arise from imperfect knowledge of the parton distribution functions (PDFs), from the uncertainty in the strong-interaction coupling s, and from the choice of quantum chromodynamics (QCD) renormalization and factorization scales
The results are obtained from a sample of proton-proton collisions at a center-of-mass energy of 7 TeV, recorded by the Compact Muon Solenoid (CMS) detector at the Large Hadron Collider (LHC) in 2010, which correspond to an integrated luminosity of 35:9 Æ 1:4 pbÀ1
Summary
The production of Z and W bosons, which may be identified through their leptonic decays, is theoretically well described within the framework of the standard model. Measurements of the inclusive Z and W production cross sections performed by the Compact Muon Solenoid (CMS) experiment [3] show agreement with the latest theoretical predictions both for the absolute values and for the ratios Wþ=WÀ and W=Z. We present measurements of the rapidity and transverse-momentum distributions for Drell–Yan muon and electron pairs in the Z-boson mass region (60 < M‘‘ < 120 GeV). The measurement of the rapidity (y) and transverse-momentum (qT) distributions of the Z-boson provides new information about the dynamics of proton collisions at high energies. We report measurements which cover the range in rapidity up to 3.5 and in transverse momentum up to 600 GeV, a similar range to results recently reported by the ATLAS experiment [11,12]. The rapidity measurement is sensitive to the PDFs for proton momentum fractions (x) between 4 Â 10À4 and 0.43
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