The $\cos2φ$ azimuthal asymmetry of unpolarized dilepton production at the $Z$-pole

Details The $\cos2φ$ azimuthal asymmetry of unpolarized dilepton production at the $Z$-pole The $\cos2φ$ azimuthal asymmetry of unpolarized dilepton production at the $Z$-pole

2011-07-23

arxiv.org/abs/1107.4693v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

comments and references added, journal version

Scientific paper

We calculate the Boer-Mulders effect contribution to the $\cos2\phi$ azimuthal asymmetry of unpolarized dilepton production near the $Z$-pole. Based on the tree-level expression in the transverse momentum dependent factorization framework, we show that the corresponding asymmetry near the $Z$-pole is negative, which is opposite to the asymmetry in the low $Q^2$ region, dominated by the production via a virtual photon. We calculate the asymmetry generated by the Boer-Mulders effect near the $Z$-pole at RHIC, with $\sqrt{s}=500$ GeV. We find that the magnitude of the asymmetry is several percent, and therefore it is measurable. The experimental confirmation of this sign change of the asymmetry from the low $Q^2$ region to the $Z$-pole provides direct evidence of the chiral odd structure of quarks inside an unpolarized nucleon.

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