Flavor separation of the Boer-Mulders function from unpolarized $π^- p$ and $π^- D$ Drell-Yan processes

Details Flavor separation of the Boer-Mulders function from unpolarized $π^- p$ and $π^- D$ Drell-Yan processes Flavor separation of the Boer-Mulders function from unpolarized $π^- p$ and $π^- D$ Drell-Yan processes

2007-01-31

arxiv.org/abs/hep-ph/0702006v1

Phys.Lett. B639 (2006) 494-498

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures, published in Physics Letters B

Scientific paper

10.1016/j.physletb.2006.06.053

We show that measuring the $\cos 2\phi $ angular dependence in unpolarized Drell-Yan processes with $\pi^-$ beams colliding on proton and deuteron targets can determine the ratio of the Boer-Mulders functions for $d$ and $u$ quarks inside the proton $h_1^{\perp,d}/h_1^{\perp,u}$, which is still lack of theoretical constraint. The comparison of the $\cos 2 \phi$ asymmetries measured in unpolarized $\pi^- p$ and $\pi^- D$ Drell-Yan processes, which are accessible at CERN by the COMPASS collaboration, can help to discriminate whether $h_1^\perp$ effects or QCD vacuum effects are preferred by data.

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