Proposal to observe the strong Van der Waals force in e+\bar{e} -> 2 π

Details Proposal to observe the strong Van der Waals force in e+\bar{e} -> 2 π Proposal to observe the strong Van der Waals force in e+\bar{e} -> 2 π

2003-10-04

arxiv.org/abs/hep-ph/0310057v1

AIP Conf.Proc.717:200-208,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 7eps figures

Scientific paper

10.1063/1.1799705

Large discrepancy of the p-wave phase shift data $\delta_{1}(\nu)$ of the $\pi$-$\pi$ scattering from those of the dispersion calculation is pointed out. In order to determine which is correct, the pion form factor $F_{\pi}(\nu)$, which is the second source of information of the phase shift $\delta_{1}(\nu)$, is used. It is found that the phase shift obtained from the dispersion is not compatible with the data of the pion form factor. What is wrong with the dispersion calculation, is considered.

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