Direct Measurement of the $W$ Production Charge Asymmetry in $\ppbar$ Collisions at $\sqrt{s} = 1.96$ TeV

The CDF Collaboration; T. Aaltonen

Paper

Direct Measurement of the $W$ Production Charge Asymmetry in $\ppbar$ Collisions at $\sqrt{s} = 1.96$ TeV

Abstract

We present the first direct measurement of the

production charge asymmetry as a function of the

boson rapidity

collisions at

. We use a sample of

events in data from 1

of integrated luminosity collected using the CDF II detector. In the region

3.0, this measurement is capable of constraining the ratio of up and down quark momentum distributions in the proton more directly than in previous measurements of the asymmetry that are a function of the charged-lepton pseudorapidity.