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arXiv · hep-ph/9703253

Partial-Wave Amplitudes and Resonances in pbar + p -> pi + pi

B. R. Martin·G. C. Oades
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Abstract

Partial wave amplitudes have been extracted from accurate data on pbar + p -> pi + pi by a method which incorporates the theoretical constraints of analyticity and crossing symmetry. The resulting solution gives a good fit to the annihilation data and is also consistent with the wealth of information in the crossed channel pi + N -> pi + N. The partial wave amplitudes show evidence for resonances in all partial waves with J < 6, at least one of which, a J = 0+ state, (and possibly another with J = 1-) is unlikely to have a simple quark-antiquark structure.

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B. R. Martin, G. C. Oades. 1997-03-06. Partial-Wave Amplitudes and Resonances in pbar + p -> pi + pi. https://doi.org/10.1103/physrevc.56.1114

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