Super-PINGU for measuring CP violation

TL;DR

Super-PINGU aims to measure leptonic CP violation by upgrading the PINGU detector to a larger volume, focusing on atmospheric neutrinos in the 0.5-1 GeV range, and analyzing uncertainties affecting measurement significance.

Contribution

This work proposes a novel upgrade to the PINGU detector, called super-PINGU, designed to measure the CP phase with atmospheric neutrinos, addressing key uncertainties impacting measurement accuracy.

Findings

Super-PINGU can distinguish CP phase $ heta$ in the range $rac{ p{ ext{pi}}}{2}$-$rac{3 ext{pi}}{2}$ from 0 after 4 years.

Measurement significance depends on flux, cross-section, event reconstruction, and flavor identification uncertainties.

Strategies to minimize uncertainties can improve the CP violation measurement sensitivity.

Abstract

We propose to measure leptonic CP phase, after neutrino mass hierarchy is established, with an upgrade of the PINGU detector and using atmospheric neutrino flux. The upgrade, called super-PINGU, will require a few megaton effective volume at 0.5-1 GeV range to distinguish $\delta$ in the range $\pi/2$-$3\pi/2$ from 0 after 4 years of operation. The distinguishability (similar to significance) of measuring $\delta$ depends crucially on various flux, cross-section, event reconstruction (energy and angle) and flavor identification uncertainties. We explore effects of these uncertainties on the distinguishability of measuring CP phase and suggest possible ways to minimize their impact.