Hadron production in photon-photon collisions

Pandita, P. N. ; Singh, Y. (1976) Hadron production in photon-photon collisions Physical Review D - Particles, Fields, Gravitation and Cosmology, 14 (3). pp. 739-751. ISSN 1550-7998

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Official URL: http://prd.aps.org/abstract/PRD/v14/i3/p739_1

Related URL: http://dx.doi.org/10.1103/PhysRevD.14.739


We analyze deep-inelastic photon-photon collisions via the two-photon mechanism in electron-positron (-electron) colliding beams in a form especially suitable for experimental analysis. It is shown that by a helicity analysis similar to that used in electroproduction experiments, we can separate five of the eight structure functions describing the process γ→hadrons. The helicity cross sections for this process and for the process with one real photon (inelastic electron-photon scattering) are related to structure functions, and are evaluated using quark light-cone algebra. There are anomalous contributions to the structure functions for the inelastic electron-photon scattering which arise both in parton as well as generalized vector-meson-dominance models. This suggests a connection between these two types of models for photon-photon scattering. Further, we use vector-meson dominance to construct a sum rule for σ γγ→hadrons from which it is estimated that roughly 20% of the cross section should be built up from higher-mass vector states. Using a spectral representation for the total transverse cross section, and the "aligned-jet" vector-dominance model we achieve a connection, via a "correspondence principle," with the parton model for the hadron multiplicities in photon-photon collisions. We also comment on inclusive pion multiplicities and the approach to scaling for photon-photon processes in the light-cone algebra.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:34412
Deposited On:31 Mar 2011 09:55
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