Probing pretzelosity $h^{\perp}_{1T}$ via the polarized proton-antiproton Drell-Yan process

Details Probing pretzelosity $h^{\perp}_{1T}$ via the polarized proton-antiproton Drell-Yan process Probing pretzelosity $h^{\perp}_{1T}$ via the polarized proton-antiproton Drell-Yan process

2011-03-22

arxiv.org/abs/1103.4201v1

Phys.Rev.D82:114022,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures, final version in journal publication

Scientific paper

10.1103/PhysRevD.82.114022

We show that the polarized proton-antiproton Drell-Yan process is ideal to probe the pretzelosity distribution ($h_{1T}^\perp$), which is one of the new transverse-momentum-dependent parton distributions of the nucleon. We present predictions of the $\cos(2\phi + \phi_a - \phi_b)$ asymmetry in the transversely polarized proton-antiproton Drell-Yan process at PAX kinematics and find that the results are significantly larger compared with those of the $\sin(3\phi_h - \phi_S)$ asymmetry in the semi-inclusive deep inelastic scattering process at HERMES, COMPASS, and JLab kinematics. We conclude that the $\cos(2\phi + \phi_a - \phi_b)$ asymmetry in the PAX experiment can probe the new physical quantity of the pretzelosity distribution.

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