This review gives a survey of the following topics:(i) results on analyticity and asymptotic
growth that follow from axiomatic quantum field theory,(ii) bounds and inequalities involving …

Elementary particles are complicated objects, whose complexity is revealed by their
numbers and by the variety of their interactions. This book is about the high energy collisions …

We investigate the hypothesized existence of an S matrix for gravity and some of its
expected general properties. We first discuss basic questions regarding the existence of …

A bstract We provide a new set of on-shell recursion relations for tree-level scattering
amplitudes, which are valid for any non-trivial theory of massless particles. In particular, we …

An analysis of πN scattering amplitudes is performed for− 0.1 GeV 2⩾ t⩾− 0.5 GeV 2 The
resulting amplitudes have exact fixed-t analyticity and su crossing properties. They are …

Dispersion relations at fixed momentum transfer are presented from which the scattering
amplitude may be determined once one knows its modulus above s-and u-channel …

By making use of the phase representation, the relation between the high-energy behavior
of the symmetric forward scattering amplitude F (x) and the asymptotic properties of the ratio …

A simple method is derived which gives the asymptotic behavior of the forward scattering
amplitude directly on the physical cut without any restriction on the nature of oscillations …

The S-wave pion-pion scattering lengths a 0 and a 2 in the channels of total isospin 0 and 2,
respectively, are determined by requiring that the high-energy limit of the pion-pion total …

While the electromagnetic field is coupled to a current with Y= 0 with a strength 137', and the
weak current is characterized by Y= 0,+ 1 and has a strength 10", this y field is coupled to a …