1988•Unpublished venueOpen access

Contribution of the two-photon annihilation process in the measurement of sigma/sub t/ (e/sup +/e/sup /minus//. -->. hadrons at PEP)

B. C. Shen

Abstract

The possible impact of the 2..gamma.. process e/sup /plus//e/sup/minus// ..-->.. e/sup /plus//e/sup /minus// /plus/ hadrons is evaluated as a source of background for the study of the one photon annihilation process. Two regions of hadron system invariant mass are considered---the resonance region with low invariant mass, and the ''diffractive'' region above 2 GeV hadron invariant mass. In spite of the fact that the 2..gamma.. cross-section rises with the energy of the initial e/sup /plus//e/sup /minus// system, it seems clear that measurements of the total energy of the final hadron system will allow the clean separation of the 2..gamma.. events from the single photon annihilation reaction.

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Key concepts: Annihilation, Hadron, Physics, Invariant mass, Particle physics, Nuclear physics, Sigma, Electron–positron annihilation