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)