We use the standard Glashow-Salam-Weinberg SU(2)L×U(1) electroweak theory to calculate the charge asymmetry expected for lepton-pair production in proton-nucleon collisions at various center-of-mass energies. Specifically, we discuss the prospect of measuring charge asymmetry as a means to determine the electroweak mixing parameter sin2W, using a proton-beam energy of around 800 GeV. As motivated by the observation that an additional (nonstandard) gauge boson in a low-energy theory appears naturally in the E8×E8 superstring studies, we also adopt an extended SU(2)L×U(1)×U(1) electroweak model. To study manifestations of the nonstandard gauge boson, we consider a fixed-target experiment at a few TeV as well as for a proton-antiproton or proton-proton collider experiment in the few-TeV range. In particular, the behavior of charge asymmetry near the standard Z0 pole is investigated as a possible means to determine the Z0-Z0 mixing parameter sin. The possibility of a direct search for the nonstandard gauge boson Z0 at Fermilab Tevatron energies is also briefly discussed.
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)