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Observation of the beam-size effect at HERA

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Zeitschrift für Physik C Particles and Fields

Abstract

A precise measurement of the spectrum of the photons fromep 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 ofep bremsstrahlung at HERA energies.

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Authors and Affiliations

  1. High Energy Physics Lab., Institute of Nuclear Physics, ul. Kawiory 26a, PL-30-055, Kraków, Poland

    Krzysztof Piotrzkowski

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  1. Krzysztof Piotrzkowski
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piotrzkowski@desy.de

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Piotrzkowski, K. Observation of the beam-size effect at HERA. Z. Phys. C - Particles and Fields 67, 577–583 (1995). https://doi.org/10.1007/BF01553983

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  • DOI: https://doi.org/10.1007/BF01553983

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