High energy neutrinos from choked GRBs and their flavor ratio measurement by the IceCube

TL;DR

This paper investigates how matter and vacuum oscillations affect high-energy neutrino fluxes from choked GRBs and how these effects influence flavor ratio measurements in IceCube.

Contribution

It introduces a detailed analysis of matter oscillation effects on neutrino flavor ratios from choked GRBs, including shadowing and tau decay contributions in IceCube.

Findings

Matter effects suppress CP phase differences in flavor ratios.

Flavor ratio R varies with spectral index α.

Shadowing and tau decay significantly impact flux measurements.

Abstract

The high energy neutrinos produced in a choked GRB can undergo matter oscillation before emerging out of the stellar envelope. Before reaching the detector on Earth, these neutrinos can undergo further vacuum oscillation and then Earth matter oscillation. In the context of IceCube we study the Earth matter effect on neutrino flux in the detector. For the calculation of track-to-shower ratio R in the IceCube, we have included the shadowing effect and the additional contribution from the muon track produced by the high energy tau lepton decay in the vicinity of the detector. We observed that R is different for different CP phases in vacuum but the matter effect suppresses these differences. We have also studied the behavior of R when the spectral index $\alpha$ varies.