Single-Spin Polarization Effects and the Determination of Timelike Proton Form Factors

Details Single-Spin Polarization Effects and the Determination of Timelike Proton Form Factors Single-Spin Polarization Effects and the Determination of Timelike Proton Form Factors

2003-10-23

arxiv.org/abs/hep-ph/0310277v1

Phys.Rev.D69:054022,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTex, 12 pages, 4 figures

Scientific paper

10.1103/PhysRevD.69.054022

We show that measurements of the proton's polarization in electron-positron annihilation to a proton-antiproton pair $e^+ e^- \to p \bar p$ strongly discriminate between the analytic forms of models which fit the proton form factors in the spacelike region. In particular, the single-spin asymmetry normal to the scattering plane measures the relative phase difference between the timelike $G_E$ and $G_M$ form factors. The expected proton polarization in the timelike region is large, of order of several tens of percent.

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