$T$-Odd Effects in Unpolarized Drell-Yan Scattering

Details $T$-Odd Effects in Unpolarized Drell-Yan Scattering $T$-Odd Effects in Unpolarized Drell-Yan Scattering

2005-06-14

arxiv.org/abs/hep-ph/0506127v1

Phys.Lett.B650:362-368,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 8 figures

Scientific paper

10.1016/j.physletb.2007.05.043

We consider the leading twist $T$-odd contributions as the dominant source of the $\cos 2\phi$ azimuthal asymmetry in unpolarized $p\bar{p}\to \mu\mu^+ X$ dilepton production in Drell-Yan Scattering. This asymmetry contains information on the distribution of quark transverse spin in an unpolarized proton. In a parton-spectator framework we estimate these asymmetries at $50 {\rm GeV}$ center of mass energy. This azimuthal asymmetry is interesting in light of proposed experiments at GSI, where an anti-proton beam is ideal for studying the transversity properties of quarks due to the dominance of {\em valence} quark effects.

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