Abstract
We present the first direct measurement of the production charge asymmetry as a function of the boson rapidity in collisions at . We use a sample of events in data from of integrated luminosity collected using the CDF II detector. In the region , 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 functions of the charged-lepton pseudorapidity.
- Received 15 January 2009
DOI:https://doi.org/10.1103/PhysRevLett.102.181801
©2009 American Physical Society