Measurement of the lepton charge asymmetry in W-boson decays produced in p-pbar collisions
F. Abe et. al, The CDF Collaboration
Abstract
We describe a measurement of the charge asymmetry of leptons from W boson decays in the rapidity range 0<|yl|<2.5 using W --> enu, munu events from 110+/-7 pb-1of data collected by the CDF detector during 1992-95. The asymmetry data constrain the ratio of d and u quark momentum distributions in the proton over the x range of 0.006 to 0.34 at Q2 ≈ MW2. The asymmetry predictions that use parton distribution functions obtained from previously published CDF data in the central rapidity region (0.0<|yl|<1.1) do not agree with the new data in the large rapidity region (|yl|>1.1).
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