Neutrino Oscillation in Magnetized Gamma-Ray Burst Fireball

TL;DR

This paper investigates the resonant oscillation of low-energy neutrinos within magnetized gamma-ray burst fireballs, analyzing how these oscillations depend on fireball conditions and neutrino parameters.

Contribution

It introduces a detailed study of neutrino oscillations in the dense, magnetized plasma of GRB fireballs considering recent neutrino oscillation data.

Findings

Calculated resonance lengths for neutrinos in fireball conditions

Estimated fireball observables like lepton asymmetry and baryon load

Analyzed the impact of magnetic fields on neutrino oscillations

Abstract

Neutrinos of energy about 5-20 MeV are produced due to the stellar collapse or merger events that trigger the Gamma-Ray Burst. Also low energy MeV neutrinos are produced within the fireball due to electron positron annihilation and nucleonic bremsstrahlung. Many of these neutrinos will propagate through the dense and relativistic magnetized plasma of the fireball. We have studied the possibility of resonant oscillation of $\nu_e\leftrightarrow \nu_{\mu,\tau}$ by taking into account the neutrino oscillation parameters from SNO, SuperKamiokande and Liquid Scintillator Detector. Using the resonance condition we have calculated the resonance length for these neutrinos and also the fireball observables like lepton asymmetry and the baryon load are estimated based on the assumed fireball radius of 100 Km.