A 20 GeVs transparent neutrino astronomy from the North Pole?

TL;DR

This paper proposes a novel neutrino astronomy method at the South Pole using energy-dependent flavor conversion to detect noise-free astrophysical neutrinos from the North Pole, enhancing angular resolution with additional detector strings.

Contribution

It introduces a new detection strategy leveraging muon neutrino flavor conversion at specific energies and proposes an array upgrade to improve resolution and reduce background noise.

Findings

Potential for noise-free neutrino detection in the 18-27 GeV range.

Enhanced angular resolution with doubled detector strings.

Possible detection of CPT violation effects in atmospheric anti-muon neutrinos.

Abstract

Muon neutrino astronomy is drown within a polluted atmospheric neutrino noise. However at 24 GeV energy atmospheric muon neutrinos, while rising vertically along the terrestrial diameter, should disappear (or be severely depleted) while converting into tau flavor: any rarest vertical 12 GeV muon track at South Pole Deep Core volume, pointing back to North Pole, might be tracing mostly a noise-free astrophysical signal. The corresponding Deep Core 6-7-8-9 channels trigger maybe point in those directions and inside that energy range without much background. Deep Core detector at South Pole, may scan at 18-27GeV energy windows, into a narrow vertical cone for a novel neutrino astronomy almost noise-free, pointing back toward the North Pole.Unfortunately muon at 12 GeV trace their arrival direction mostly spread around an unique string in a zenith-cone solid angle. To achieve also an azimuth angular resolution a two string detection at once is needed. The doubling of the Deep Core string number, (two new arrays of six string each, achieving an average detection distance of 36.5 m), is desirable, leading to a larger Deep Core detection mass (more than double) and a sharper zenith and azimuth angular resolution by two-string vertical axis detection. Such an improvement may show a noise free (at least factor ten) muon neutrino astronomy. This enhancement may also be a crucial probe of a peculiar anisotropy foreseen for atmospheric anti-muon, in CPT violated physics versus conserved one, following a hint by recent Minos results.