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

Ananthanarayan, B and Caprini, Irinel and Imsong, Sentitemsu I (2011) Implications of the recent high statistics determination of the pion electromagnetic form factor in the timelike region. In: Physical Review D - Particles, Fields, Gravitation and Cosmology, 83 (9).

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Abstract

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, < r(pi)(2)> = (0.435 +/- 0.005) fm(2) and F(-1.6 GeV2) = 0.243(-0.014)(+0.022), we obtain the allowed ranges 3.75 GeV-4 less than or similar to c less than or similar to 3.98 GeV-4 and 9.91 GeV-6 less than or similar to d less than or similar to 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 cannot have zeros.

Item Type:	Journal Article
Publication:	Physical Review D - Particles, Fields, Gravitation and Cosmology
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	30 May 2011 08:56
Last Modified:	30 May 2011 08:56
URI:	http://eprints.iisc.ac.in/id/eprint/37797

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