Blessed Results from the W Charge Asymmetry Analysis

Author's: Cigdem Issever, Tim Nelson, Adam Scott and David Stuart


Abstract
We report a measurement of the forward-backward charge asymmetry of electrons from W boson decays in p pbar collisions at sqrt(s)=1.96 TeV using a data sample of 170 pb-1 collected by the Collider Detector at Fermilab. The asymmetry is measured as a function of electron rapidity and transverse energy and provides new input on the momentum fraction dependence of the u and d quark parton distribution functions within the proton. Paper accepted for publication by Phys. Rev. D Rapid Communications, hep-ex/0501023

The inner errors in the plots below are the statistical errors. The outer error bars are the total errors.


Raw Asymmetry
Raw Asymmetry 25 < Et < 35 GeV
Raw Asymmetry 35 < Et < 45 GeV
Raw Asymmetry (.eps)(.gif) Raw Asymmetry 25 < Et < 35 GeV (.eps)(.gif) Raw Asymmetry 35 < Et < 45 GeV (.eps)(.gif)
Corrected Asymmetry
Corrected Asymmetry 25 < Et < 35 GeV
Corrected Asymmetry 35 < Et < 45 GeV
Corrected Asymmetry (.eps)(.gif) Corrected Asymmetry 25 < Et < 35 GeV (.eps)(.gif) Corected Asymmetry 35 < Et < 45 GeV(.eps)(.gif)
Corrected |Asymmetry|
Corrected |Asymmetry| 25 < Et < 35 GeV
Corrected |Asymmetry| 35 < Et < 45 GeV
Corected |Asymmetry| (.eps)(.gif) Corrected |Asymmetry| 25 < Et < 35 GeV (.eps)(.gif) Corrected |Asymmetry| 35 < Et < 45 GeV(.eps)(.gif)
Charge Misidentification Probability
Charge Misidentification Probability 25 < Et < 35 GeV
Charge Misidentification Probability 35 < Et < 45 GeV
Charge Misidentification Probability (.eps)(.gif) Charge Misidentification Probability 25 < Et < 35 GeV(.eps)(.gif) Charge Misidentification Probability 35 < Et < 45 GeV(.eps)(.gif)
Difference in Charge Mis-Id for Positrons and Electrons
Difference in Charge Mis-Id for Positrons and Electrons 25 < Et < 35 GeV
Difference in Charge Mis-Id for Positrons and Electrons 35 < Et < 45 GeV
Difference in Charge Mis-Id for Positrons and Electrons (.eps)(.gif) Difference in Charge Mis-Id for Positrons and Electrons 25 < Et < 35 GeV (.eps)(.gif) Difference in Charge Mis-Id for Positrons and Electrons 35 < Et < 45 GeV (.eps)(.gif)
QCD background
QCD background 25 < Et < 35 GeV
QCD background 35 < Et < 45 GeV
QCD Background (.eps)(.gif) QCD Background 25 < Et < 35 GeV (.eps)(.gif) QCD Background 35 < Et < 45 GeV (.eps)(.gif)
Uncorrected (Raw) Asymmetry fine binning
Uncorrected (Raw) Asymmetry fine binning (.eps)(.gif)