Observation of the beam-size effect at HERA

Details Observation of the beam-size effect at HERA Observation of the beam-size effect at HERA

1995-04-11

arxiv.org/abs/hep-ex/9504003v1

Z.Phys.C67:577-584,1995

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, latex

Scientific paper

10.1007/BF01553983

A precise measurement of the spectrum of the photons from $ep$ bremsstrahlung with the ZEUS luminosity monitor at HERA is reported. The measurement shows a reduced rate compared to the Bethe-Heitler spectrum for photon energies below 5~GeV. This suppression, called the beam-size effect, is explained by the finite transverse size of the beam overlap relative to the typical impact parameter in the process of $ep$ bremsstrahlung at HERA energies.

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