Constraints on the $\omega \pi$ form factor from analyticity and unitarity

Abstract

Motivated by the discrepancies noted recently between the theoretical calculations of the electromagnetic $\omega \pi$ form factor and certain experimental data, we investigate this form factor using analyticity and unitarity in a framework known as the method of unitarity bounds.We use a QCD correlator computed on the spacelike axis by operator product expansion and perturbative QCD as input, and exploit unitarity and the positivity of its spectral function, including the two-pion contribution that can be reliably calculated using high-precision data on the pion form factor. From this information, we derive upper and lower bounds on the modulus of the $\omega \pi$ form factor in the elastic region. The results provide a significant check on those obtained with standard dispersion relations, confirming the existence of a disagreement with experimental data in the region around 0.6 GeV.

arXiv comment8 pages, 1 figure; v2: improved bounds using isovector current, improved discussion, version to be published in EPJC

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