M ay 2 00 4 A reformulation of intrabeam scattering theory

The motivation for the treatment of intrabeam scattering theory given in this paper was to find results which would be convenient for computing the intrabeam scattering growth rates for particle distributions which are more complicated than a simple gaussian. It was shown by A. Piwinski that beam growth rates due to intrabeam scattering can be expressed as a multidimensional integral [1]. It was pointed out by J. Bjorken and S. Mtingwa [2] that the reduction of the multidimensional integral to a 3-dimensional untegral is made easier by writing the integral so that its relativistic transformation properties are more obvious. The starting point in [2] was a result from the treatment of the two body scattering problem in relativistic quantum theory. In this paper the starting point is the relativistic transformation properties of the scattering cross section which may be a more familiar starting point. The resulting expression for the multidimen-sional integral is simpler to reduce. In addition, the results do not depend on the particular form of the Coulomb cross section that was used in [2] and are valid for any collision cross section.