Implications of the recent high statistics determination of the pion electromagnetic form factor in the timelike region

Details Implications of the recent high statistics determination of the pion electromagnetic form factor in the timelike region Implications of the recent high statistics determination of the pion electromagnetic form factor in the timelike region

2011-02-16

arxiv.org/abs/1102.3299v2

Phys.Rev.D83:096002,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 7 figures, uses revtex, v2 corresponds to version to appear in Physical Review D; discussion enhanced and references

Scientific paper

10.1103/PhysRevD.83.096002

The recently evaluated two-pion contribution to the muon g-2 and the phase of the pion electromagnetic form factor in the elastic region, known from \pi\pi scattering by Fermi-Watson theorem, are exploited by analytic techniques for finding correlations between the coefficients of the Taylor expansion at t=0 and the values of the form factor at several points in the spacelike region. We do not use specific parametrizations and the results are fully independent of the unknown phase in the inelastic region. Using for instance, from recent determinations, = (0.435 \pm 0.005) fm^2 and F(-1.6 GeV^2)=0.243^{+0.022}_{-0.014}, we obtain the allowed ranges 3.75 GeV^{-4}\lesssim c \lesssim 3.98 GeV^{-4} and 9.91 GeV^{-6}\lesssim d \lesssim 10.46 GeV^{-6} for the curvature and the next Taylor coefficient, with a strong correlation between them. We also predict a large region in the complex plane where the form factor can not have zeros.

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