Non-zero transversity distribution of the pion in a quark-spectator-antiquark model

Details Non-zero transversity distribution of the pion in a quark-spectator-antiquark model Non-zero transversity distribution of the pion in a quark-spectator-antiquark model

2004-11-02

arxiv.org/abs/hep-ph/0411043v2

Phys.Rev. D70 (2004) 094044

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 LaTex Pages in Revtex format, 5 figures. Version to appear in PRD

Scientific paper

10.1103/PhysRevD.70.094044

We calculate the non-zero (na\"{i}ve) T-odd transverse momentum dependent transversity distribution $h_1^{\perp}(x,\kp^2)$ of the pion in a quark-spectator-antiquark model. The final-state interaction is modelled by the approximation of one gluon exchange between the quark and the antiquark spectator. Using our model result we estimate the unsuppressed cos2$\phi$ azimuthal asymmetry in unpolarized $\pi^-p$ Drell-Yan process. We find that the transverse momentum dependence of $h_1^{\perp}(x,\kp^2)$ of the pion is the same as that of $h_1^{\perp}(x,\kp^2)$ of the proton calculated from the quark-scalar-diquark model, although the $x$ dependencies of them are different from each other. This suggests a connection between cos2$\phi$ asymmetries in Drell-Yan processes with different initial hadrons.

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