Phys. Rev. Lett. 91, 014801 (2003) [4 pages]Is the Electron Radiation Length Constant at High Energies?Received 7 April 2003; published 1 July 2003 Experimental results for the radiative energy loss of 149, 207, and 287 GeV electrons in a thin Ir target are presented. From the data we conclude that at high energies the radiation length increases in accordance with the Landau-Pomeranchuk-Migdal (LPM) theory and thus electrons become more penetrating the higher the energy. The increase of the radiation length as a result of the LPM effect has a significant impact on the behavior of high-energy electromagnetic showers. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.014801
DOI:
10.1103/PhysRevLett.91.014801
PACS:
41.60.–m, 07.85.Fv, 29.40.Vj, 95.30.Gv
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