1997/07/21 by H. B. O'Connell, K. Maltman, O'Connell, H. B. +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9707404
14 pages with one figure. Uses epsfig.sty
arxiv created 1997/07/21 · arxiv updated 2009/11/30
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.