Near-threshold Isospin Violation in the Pion Form Factor from Chiral Perturbation Theory

Details Near-threshold Isospin Violation in the Pion Form Factor from Chiral Perturbation Theory Near-threshold Isospin Violation in the Pion Form Factor from Chiral Perturbation Theory

1997-07-21

arxiv.org/abs/hep-ph/9707404v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages with one figure. Uses epsfig.sty

Scientific paper

We examine the isospin violation in the timelike pion form factor near threshold at next-to-leading order in the chiral expansion using the techniques of Chiral Perturbation Theory. This next-to-leading order contribution contains the first nonvanishing isospin violation. This isospin violation is found to be very small near threshold. In particular, the isospin violation at threshold is found to be of order 10^-4, which should be compared with the few percent level seen in the vector meson resonance region.

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