CMS-PAS-SMP-18-012

CMS-PAS-SMP-18-012
Measurement of the W boson rapidity, helicity, and differential cross sections in pp collisions at $\sqrt{s}=$ 13 TeV
CMS Collaboration
February 2020

Abstract: The differential cross section and charge asymmetry for inclusive W boson production at $\sqrt{s}=$ 13 TeV is measured for the two transverse polarization states as a function of the W boson absolute rapidity. The measurement uses events in which a W boson decays to either an electron or a muon and a neutrino. The data sample of proton-proton collisions recorded with the CMS detector at the LHC in 2016 corresponds to an integrated luminosity of 35.9 fb $^{-1}$ . The absolute differential cross section, and its value normalized to the total inclusive W boson production cross section, are measured over the rapidity range $\| Y_{\mathrm{W}} \| <$ 2.5. In addition, the W boson double-differential cross section, $\mathrm{d}^2\sigma/\mathrm{d}p_{\mathrm{T}}^{\ell} \mathrm{d}\|\eta^{\ell}\|$ , and the charge asymmetry, are measured as a function of the charged lepton transverse momentum and pseudorapidity. The precision of these measurements is used to constrain the parton density functions (PDF) of the proton using the next-to-leading-order PDF set NNPDF3.0.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, PRD 102 (2020) 092012. The superseded preliminary plots can be found here.

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