We present the first direct measurement of the W production
charge asymmetry as a function of the W boson rapi+dity y_w in p anti-p
collisions at s**(1/2) ñ.96 TeV. We use a sample of W --> e nu events
in data from 1 fb-1 of integrated luminosity collected using the CDF
II detector. In the region |y_w| < 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 pseudorapi+dity.
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Updated: Thursday, 2009 June 11 15:01:37 CDT automatically from input from carol picciolo