Conceptual Design of the Muonium-to-Antimuonium Conversion Experiment (MACE)

TL;DR

The MACE experiment aims to detect or constrain the rare muonium-to-antimuonium conversion process, providing insights into physics beyond the Standard Model through a specialized experimental setup.

Contribution

This paper presents the conceptual design and theoretical framework of the MACE experiment, a novel approach to search for muonium-to-antimuonium conversion.

Findings

Design of a high-sensitivity experiment for muonium-to-antimuonium conversion

Potential to constrain new physics beyond the Standard Model

Expected sensitivity to a conversion probability of around 10^{-13}

Abstract

The spontaneous conversion of muonium to antimuonium is one of the interesting charged lepton flavor violation phenomena offering a sensitive probe of potential new physics and serving as a tool to constrain the parameter space beyond the Standard Model. The Muonium-to-Antimuonium Conversion Experiment (MACE) is designed to utilize a high-intensity muon beam, a Michel electron magnetic spectrometer, a positron transport system, and a positron detection system, to either discover or constrain this rare process with a conversion probability of $\mathcal{O}(10^{-13})$. This article presents an overview of the theoretical framework as well as a detailed description of the experimental design for the search for muonium-to-antimuonium conversion.