Speaker
Dr
Kwang-Chang Lai
(Chang Gung University)
Description
We propose a new method to identify flavors of ultra high energy cosmic neutrinos. Energy loss of leptons in matter provides important informations for the detection of neutrinos originated from high energy astrophysical sources. 50 years ago, Askaryan proposed to detect Cherenkov signals by radio wave from the negative charge excess of particle showers. The theory of Cherenkov pulses with Fraunhofer approximation was widely studied in the past two decades. However, at high energies or for high density materials, electromagnetic shower should be elongated due to the Landau-Pomeranchuck-Migdal (LPM) effect. As the standard Fraunhofer approximation ceases to be valid, we perform Monte Carlo simulations recently to investigate this regime based on the finite-difference time-domain (FDTD) method, and modified time domain integration method. Adopting the deduced relationship between the radio signal and the cascade development profile, we investigate its implication to lepton signatures. Our method provides a straightforward technique to identify the neutrino flavor through the detected Cherenkov signals.
Primary author
Dr
Kwang-Chang Lai
(Chang Gung University)
Co-authors
Mr
Chih-Ching Chen
(National Taiwan University)
Prof.
Pisin Chen
(National Taiwan University)
