Is the electron radiation length constant at high energies?
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.
Hansen
H D
HD
Department of Physics and Astronomy, University of Aarhus, Denmark.
Uggerhøj
U I
UI
Biino
C
C
Ballestrero
S
S
Mangiarotti
A
A
Sona
P
P
Ketel
T J
TJ
Vilakazi
Z Z
ZZ