At the Fermilab Tevatron proton-antiproton (p ̄p) collider, high-mass electron-neutrino (eν) pairs are produced predominantly in the process
p ̄p→W(→eν)+X
. The asymmetry of the electron and positron yield as a function of their pseudorapidity constrain the slope of the ratio of the
u- to d-quark parton distributions versus the fraction of the proton momentum carried by the quarks. This paper reports on the measurement of the electron-charge asymmetry using the full data set recorded by the Collider Detector at Fermilab in 2001–2011 and corresponding to 9.1 fb−1
of integrated luminosity. The measurement significantly improves the precision of the Tevatron constraints on the parton-distribution functions of the proton. Numerical tables of the measurement are provided.
