Measurement of the muon charge asymmetry in inclusive pp→W+X production at √s = 8 CMS.TeV

Entry in CERN CDS SMP-14-022


Measurements of the muon charge asymmetry in inclusive pp→W+X→μν+X production at √s=8 CMS.TeV are presented. The data sample corresponds to an integrated luminosity of 18.8 fb-1 recorded with the CMS detector at the LHC. These new results provide additional constraints on the parton distribution functions of the proton in the range of the Bjorken scaling variable x from 10-3 to 10-1.

List of Figures

Signal Fits

Examples of fits in three |η| ranges: 0.0<|η|<0.2 (top), 1.0<|η|<1.2 (center) and 2.1<|η|<2.4 (bottom). For each |η| range, results for W+ (left) and W- (right) are shown. The ratios between the data points and the final fits are shown at the bottom of each panel.

PDF format, PNG format
PDF format, PNG format

PDF format, PNG format
PDF format, PNG format

PDF format, PNG format
PDF format, PNG format


PDF format, PNG format
  Comparison of the measured muon charge asymmetries to NLO predictions calculated using the FEWZ3.1 MC tool interfaced with four different PDF sets. The vertical error bars on data points include both statistical and systematic uncertainties. The PDF uncertainty for each PDF set is shown by the shaded~(or hatched) band and corresponds to 68%CL. The NNPDF3.0 and MMHT2014 PDF fits include previous lepton charge asymmetries measured by CMS at √s=7 CMS.TeV.

QCD Analysis

Distributions of u valence (left) and d valence (right) quarks as functions of x at the scale Q2=mW2. The results of the fit to the HERA data and muon asymmetry measurements (light shaded band), and to HERA only (dark hatched band) are compared. The total PDF uncertainties are shown. In the bottom panels the distributions are normalized to one for a direct comparison of the uncertainties. The change of the PDFs with respect to the HERA-only fit is represented by a solid line.

PDF format, PNG format
PDF format, PNG format

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