Density-Matrix Formalism for Lepton-Hadron Scattering
- 1 November 1970
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 2 (9), 1985-1998
- https://doi.org/10.1103/physrevd.2.1985
Abstract
A density-matrix approach is presented for lepton-hadron reactions. We give a unified treatment of electroproduction, neutrino-induced production, decay, and colliding-beam-type processes. In this formulation, the lepton reactions are treated in a manner completely analogous to the hadronic reactions involving decaying resonances. The general content of our result for the differential cross section can be stated as a product of finite-dimensional representations of the group or group for the lepton pair and a hadronic density matrix. The group changes from noncompact to compact , depending upon whether the momentum of the lepton pair involved in the interaction is spacelike or timelike. Formulas are given for general lepton-induced reactions. Specific reactions (total inelastic lepton scattering and leptonic pion, , and production) are discussed in detail. In this formulation, the implications of Regge-pole theory, low-energy theory, partial conservation of axial-vector current, and current algebra can be easily studied.
Keywords
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