HIKE: High Intensity Kaon Experiments at the CERN SPS

TL;DR

The HIKE project at CERN aims to utilize high intensity kaon beams to perform precise measurements of rare kaon decays, testing the Standard Model and searching for new physics phenomena.

Contribution

It proposes a comprehensive experimental program building on NA62 to measure rare decay branching ratios with high precision and explore new physics in the kaon sector.

Findings

Plans to measure $K^+ o ext{pi}^+ uar{ u}$ to 5% accuracy

Plans to measure $K_L o ext{pi}^0 uar{ u}$ to 20% accuracy

Preparation for tests of lepton universality and exotic particle searches

Abstract

The availability of high intensity kaon beams at the CERN SPS North Area gives rise to unique possibilities for sensitive tests of the Standard Model in the quark flavor sector. Precise measurements of the branching ratios for the flavor-changing neutral current decays $K\to\pi\nu\bar{\nu}$ can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. Building on the success of the NA62 experiment, plans are taking shape at CERN for a comprehensive program that will include experimental phases to measure the branching ratio for $K^+\to\pi^+\nu\bar{\nu}$ to ~5% and to $K_L\to\pi^0\nu\bar{\nu}$ to ~20% precision. These planned experiments will also carry out lepton flavor universality tests, lepton number and flavor conservation tests, and perform other precision measurements in the kaon sector, as well as searches for exotic particles in kaon decays. We overview the physics goals, detector requirements, and project status for the next generation of kaon physics experiments at CERN.