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2007

Scalar radius of the pion and zeros in the form factor

Oller, Jose A., Roca, Luis

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The quadratic pion scalar radius, \la r^2\ra^\pi_s, plays an important role for present precise determinations of \pi\pi scattering.

Recently, Yndur\'ain, using an Omn\`es representation of the null isospin(I) non-strange pion scalar form factor, obtains \la r^2\ra^\pi_s=0.75\pm 0.07 fm^2.
This value is larger than the one calculated by solving the corresponding Muskhelishvili-Omn\`es equations, \la r^2\ra^\pi_s=0.61\pm 0.04 fm^2.
A large discrepancy between both values, given the precision, then results.

Scalar radius of the pion and zeros in the form factor · Around

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