Complex Analysis of Askaryan Radiation: A Fully Analytic Treatment including the LPM effect and Cascade Form Factor

TL;DR

This paper develops a fully analytic model of Askaryan radiation that incorporates the cascade form factor and LPM effect, enabling faster neutrino detection simulations without heavy Monte Carlo computations.

Contribution

The authors introduce a novel analytic framework for Askaryan radiation that includes the cascade form factor and LPM effect, validated against simulations and applicable to next-generation detectors.

Findings

Model matches Geant4 simulations accurately.

Analytic time-domain signals enable efficient neutrino searches.

Open-source code facilitates broader adoption.

Abstract

The Askaryan effect describes coherent electromagnetic radiation from high-energy cascades in dense media with a collective charge. We present an analytic model of Askaryan radiation that accounts simultaneously for the three- dimensional form factor of the cascade, and quantum mechanical cascade elongation via the Landau-Pomeranchuk- Migdal effect. These calculations, and the associated open-source code, allow the user to avoid computationally intensive Monte Carlo cascade simulations. Searches for cosmogenic neutrinos in Askaryan-based detectors benefit from computational speed, because scans of Askaryan parameter-space are required to match neutrino signals. The Askaryan field is derived from cascade equations verified with Geant4 simulations, and compared with prior numerical and semi-analytic calculations. Finally, instructive cases of the model are transformed from the Fourier domain to the time-domain. Next-generation in situ detectors like ARA and ARIANNA can use analytic time- domain signal models to search for correlations with event candidates.