JUNO Sensitivity on Proton Decay $p\to \bar\nu K^+$ Searches

TL;DR

This paper evaluates JUNO's potential to detect proton decay in the $p o ar u K^+$ channel, highlighting its high detection efficiency and background suppression capabilities, leading to competitive sensitivity over 10 years.

Contribution

It presents a detailed sensitivity study of JUNO for proton decay in the $p o ar u K^+$ mode, demonstrating its competitive detection prospects.

Findings

Detection efficiency of 36.9% for $p o ar u K^+$ decay.

Background level of 0.2 events after 10 years.

Sensitivity estimate of $9.6 imes 10^{33}$ years for proton lifetime.

Abstract

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel.