Parity-violating asymmetry of $W$ bosons produced in $p$-$p$ collisions

Details Parity-violating asymmetry of $W$ bosons produced in $p$-$p$ collisions Parity-violating asymmetry of $W$ bosons produced in $p$-$p$ collisions

2005-05-14

arxiv.org/abs/hep-ph/0505127v2

Nucl.Phys. A759 (2005) 188-197

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 Latex pages, 9 figures, final version to appear in NPA

Scientific paper

10.1016/j.nuclphysa.2005.05.146

The parity-violating asymmetry is an ideal tool to study the quark helicity distribution in the proton. We study the parity-violating asymmetry of $W^{\pm}$ bosons produced by longitudinally polarized $p$-$p$ collision in RHIC, based on predictions of quark distributions of the proton in the SU(6) quark-spectator-diquark model and a perturbative QCD based counting rule analysis. We find that the two models give nearly equal asymmetry for $W^+$ but that for $W^-$ quite different. Therefore future experiments on such quantity can help to clarify different predictions of the value $\Delta d(x)/d(x)$ at $x \to 1$ in the proton.

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