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 a neutrino and either a muon or an electron. 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 differential cross section and its value normalized to the total inclusive W boson production cross section are measured over the rapidity range $|y_\mathrm{W}|$ $\lt$ 2.5. In addition to the total fiducial cross section, the W boson double-differential cross section, d$^2\sigma$/d$p^\ell_\mathrm{T}$d$|\eta|$ and the charge asymmetry are measured as functions of the charged lepton transverse momentum and pseudorapidity. The precision of these measurements is used to constrain the parton distribution functions of the proton using the next-to-leading order NNPDF3.0 set.
Highlights
The standard model (SM) of particle physics provides a description of nature in terms of fundamental particles and their interactions mediated by vector bosons
At leading order (LO) in quantum chromodynamics (QCD), W bosons are produced at a hadron collider with small transverse momentum through the annihilation of a quark and an antiquark: udfor the Wþ and ud for the W−
This paper describes an experimental implementation of this novel method of measuring the W boson production differentially in its helicity states, rapidity, and electric charge
Summary
The standard model (SM) of particle physics provides a description of nature in terms of fundamental particles and their interactions mediated by vector bosons. At the CERN LHC, W bosons with large rapidity (jyWj) are produced predominantly with momentum in the same direction as the momentum of the quark that participates in the hard scattering. This is because the parton distribution functions (PDFs) of the. Studies of W bosons have been used by the ATLAS and CMS Collaborations to set constraints on PDFs through the measurement of charge asymmetries, in particular, as a function of the charged lepton pseudorapidity ηl [10,11,12,13,14,15,16,17,18]. This paper describes an experimental implementation of this novel method of measuring the W boson production differentially in its helicity states, rapidity, and electric charge.
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