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The cos2φ azimuthal asymmetry of unpolarized dilepton production in pp̄ collisions around Z-resonance

European Physical Journal C, ISSN: 1434-6052, Vol: 73, Issue: 1, Page: 1-6
2013
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Article Description

We calculate the cos2φ azimuthal asymmetry of the unpolarized pp̄ dilepton production process in the Z-resonance region at the Tevatron kinematic domain. Compared to the pp process, such an azimuthal asymmetry can provide additional information about a spin-related three-dimensional parton distribution function of the proton, the Boer-Mulders function. It plays a significant role in separating the contributions of the valence quarks and of the sea quarks. Besides, the Z production process is much different from the virtual photon mediate Drell-Yan process as well as the J/ψ and Υ{hooked} production processes. Our estimation indicates that this asymmetry is sizable to be detected. Therefore the available data of unpolarized proton-antiproton collision at Tevatron can contribute to our study on the spin-related structure of the nucleon. © 2013 Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica.

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