## Proceedings of the International School of Physics "Enrico Fermi.", Volume 29N. Zanichelli, 1964 - Nuclear physics |

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### Contents

Gruppo fotografico dei partecipanti al Corso fuori testo | 1 |

The JostLehmannDyson formula | 12 |

The forward dispersion relations | 18 |

Copyright | |

11 other sections not shown

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### Common terms and phrases

2-plane amplitude analytic analytic function appears assume asymptotic becomes behavior bound boundary branch points channels complex condition consider constant continuation contribution corresponding coupling course crossing defined depend derivative described determined diagram direction discussed dispersion relation domain elastic energy equation example existence expansion expression fact factor finite fixed follows formula function GeV/c give rise given gives graphs Hence high-energy imaginary implies integral interaction interest internal introduce invariance laws leading limit mass matrix means momentum moving nature negative normal Note obtained particles perturbation Phys physical plane poles positive possible potential present problem properties reactions real axis region regular resonance respect result satisfy scattering sheet shows simple singularities situation solution space surface theorem theory threshold trajectory transform unitarity condition values vanishes variables vector wave write zero