Structure functions in the polarized Drell-Yan processes with spin-1/2 and spin-1 hadrons: II. parton model

Details Structure functions in the polarized Drell-Yan processes with spin-1/2 and spin-1 hadrons: II. parton model Structure functions in the polarized Drell-Yan processes with spin-1/2 and spin-1 hadrons: II. parton model

1999-02-06

arxiv.org/abs/hep-ph/9902258v2

Phys.Rev. D60 (1999) 054018

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, REVTeX, amsmath.sty, epsfig.sty, revtex.cls, 2 eps figures. Phys. Rev. D in press. Complete postscript file is avail

Scientific paper

10.1103/PhysRevD.60.054018

We analyze the polarized Drell-Yan processes with spin-1/2 and spin-1 hadrons in a parton model. Quark and antiquark correlation functions are expressed in terms of possible combinations of Lorentz vectors and pseudovectors with the constrains of Hermiticity, parity conservation, and time-reversal invariance. Then, we find tensor polarized distributions for a spin-1 hadron. The naive parton model predicts that there exist 19 structure functions. However, there are only four or five non-vanishing structure functions, depending on whether the cross section is integrated over the virtual-photon transverse momentum \vec Q_T or the limit Q_T->0 is taken. One of the finite structure functions is related to the tensor polarized distribution b_1, and it does not exist in the proton-proton reactions. The vanishing structure functions should be associated with higher-twist physics. The tensor distributions can be measured by the quadrupole polarization measurements. The Drell-Yan process has an advantage over the lepton reaction in the sense that the antiquark tensor polarization could be extracted rather easily.

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