Abstract
At the Fermilab Tevatron proton-antiproton (pp¯) collider, high-mass electron-neutrino (eν) pairs are produced predominantly in the process pp¯→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.18 MoreReceived 9 July 2021Accepted 29 September 2021DOI:https://doi.org/10.1103/PhysRevD.104.092002Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasHadron-hadron interactionsW & Z bosonsPhysical SystemsElectronsParticles & Fields
Highlights
At the Fermilab Tevatron proton-antiproton collider, massive lepton pairs consisting of charged leptons ðlÞ and their partner neutrinos (ν) are produced in ppffipfficollisions at the center-of-momentum energy ( s) 1.96 TeV [1]
In leading-order quantum chromodynamics (QCD) calculations, 90% of Wþ bosons are produced via u þ dcollisions and a similar fraction of W− bosons via d þ ucollisions
The Tevatron measurement of Al constrains the slope of the ratio of the d- to u-quark distribution functions as a function of the Bjorken scaling parameter, the fraction x of the proton momentum taken by the colliding quark [2]
Summary
At the Fermilab Tevatron proton-antiproton (pp ) collider, massive lepton pairs consisting of charged leptons ðlÞ and their partner neutrinos (ν) are produced in ppffipfficollisions at the center-of-momentum energy ( s) 1.96 TeV [1]. The Tevatron measurement of Al constrains the slope of the ratio of the d- to u-quark distribution functions as a function of the Bjorken scaling parameter, the fraction x of the proton momentum taken by the colliding quark [2]. The final CDF measurement of the asymmetry Al in the W → eν channel is presented, using a data sample corresponding to an integrated ppluminosity of 9.1 fb−1 collected at the Tevatron collider. This measurement supersedes the previous CDF measurements [4,9], that were based on subsamples at least nine times smaller.
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