The LPM air showers initiated by UHE neutrinos and their detection by the satellite-based experiment
K. Miyazawa, K. Higashide, I. Nakamura, M. Kato+, A. Misaki, H. P. Vankov*, N. Inoue
The Graduate School of Science and Engineering, Saitama University, 338-8570 Saitama, Japan
+ Kyowa Interface Science Co., Ltd., 351-0033 Saitama, Japan
Advanced Research Institute for Science and Engineering, Waseda University, 169-0092 Tokyo, Japan
*The Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria
The Ultra-High-Energy(UHE) atmospheric showers with
strong influence of
the Landau-Pomeranchuk-Migdal(LPM) effect (here after LPM-showers) are
exclusively expected to be produced by UHE neutrinos. Studies on the
characteristics of the LPM-showers are essentially important to
discriminate neutrino-shower (which produced by neutrino interaction)
from hadronic shower (initiated by primary hadron).
We calculate the LPM-showers initiated by electrons with energies of
1018 eV to 1021 eV, using the hybrid method as exactly as possible.
Reflecting the change in the air density along the shower trajectories, the
variety of the LPM-shower profiles is shown in different cases for their
starting points in atmosphere. Through the study of time profiles of air
fluorescent photon components from the LPM-showers, the detection capability
of UHE neutrinos has also been investigated by the satellite-based experiment
with a large acceptance, e.g., the TUS experiment.