Direct measurement of the Chudakov effect |
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Authors: | Virkus T Thomsen H D Uggerh?j E Uggerh?j U I Ballestrero S Sona P Mangiarotti A Ketel T J Dizdar A Kartal S Pagliarone C;CERN NA Collaboration |
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Institution: | Department of Physics and Astronomy, University of Aarhus, Denmark. |
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Abstract: | Experimental results for the restricted energy loss of pairs created from 1-178 GeV photons in a thin Au target and subsequently passing a CCD detector are presented. It is shown that pairs--when detected close to the creation vertex--suffer a reduced energy loss due to the internal screening of the charges constituting the pair. Furthermore, the ability to measure directly the energy of the pair by calorimetry enables a comparison with theory as a function of energy. The observed phenomenon is in good qualitative agreement with general expectations from the Chudakov effect but indicates a quantitative disagreement with either of two mutually disagreeing theories. |
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