Theoretical concepts useful for high energy reactions

Theoretical concepts useful for high energy reactions. 

Semi-classical picture. The first results of high energy machine experiments with nucleons were immediately interpreted by Serber [4] on the basis of a very simple picture it continues as the basis for our physical understanding of many high energy experiments. It is difficult to improve on Berber s statements so several direct quotations from his paper follows  

1 For hyperons see L. Leprince-Ringuet et al. in Vol. XLIII of this Encyclopedia. 

At these high energies there are a sufficient number of energy and angular momentum states involved that one is approaching the classical limit of Bohr s Correspondence Principle and this is why one can anticipate the success of such a semi-classical picture. 

The sections below (except for those on elastic scattering) are essentially the quantitative application of Serber s picture. The fundamental principles apply also to mesonic processes and the high energy photoeffect with minor modifications. 

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