Prospects for an experiment to measure $BR(K_L\rightarrow \pi^0\nu\bar\nu)$ at the CERN SpS

TL;DR

This paper explores the feasibility of measuring the rare decay $BR(K_L\rightarrow \pi^0\nu\bar\nu)$ at CERN SPS, discussing design challenges, sensitivity, and long-term prospects for a successor experiment to NA62.

Contribution

It presents a feasibility study for a new experiment to measure a rare kaon decay at CERN, outlining design challenges and potential sensitivity improvements.

Findings

Preliminary feasibility assessment completed

Identified key design challenges for the experiment

Estimated sensitivity achievable at CERN SPS

Abstract

We are investigating the feasibility of performing a measurement of $BR(K_L\rightarrow\pi^0\nu\bar\nu)$ using a high-energy secondary neutral beam at the CERN SPS in a successor experiment to NA62. The timescale would require many years; we assume that the experiment would be ready at the start of LHC Run 4. Some preliminary conclusions from our feasibility studies, design challenges faced and sensitivity obtainable for the measurement are here presented.