SOME BACKGROUND PROBLEMS IN PHOTON-PHOTON COLLISIONS IN ELECTRON-POSITRON STORAGE RINGS

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Abstract
For colliding beam reactions of the type ee → eeX (X = µ– µ+ ; π– π+ ; K– K+ ; any hadrons), we compare the contribution of the background (heavy-photon bremsstrahlung type diagram) with that of the main effect (photon-photon collision type diagram) in the case where one of the electrons comes out at small angle and the other one at large angle (θ > 2°). At a beam energy of 3 GeV, it appears, for some particular values or ranges of the total invariant mass produced, that the noise/signal ratio may exceed 100 % already at moderately large values of θ. A procedure is suggested in order to reduce this ratio. We also show that the background problem is much less critical at lower beam energies

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