Direct Measurement of the Chudakov Effect

Details Direct Measurement of the Chudakov Effect Direct Measurement of the Chudakov Effect

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvl.100p4802v&link_type=abstract

Physical Review Letters, vol. 100, Issue 16, id. 164802

Physics

2

Radiation By Moving Charges, X- And Gamma-Ray Sources, Mirrors, Gratings, And Detectors, Calorimeters, Radiation Mechanisms, Polarization

Scientific paper

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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