Search for T-violation in kmu3 decay

TL;DR

This paper presents a new experiment designed to detect T-violation in muon decay, aiming to surpass current sensitivity limits and explore physics beyond the Standard Model related to the universe's matter-antimatter asymmetry.

Contribution

The paper introduces an innovative experimental setup to measure T-violation in muon decay with significantly improved sensitivity over previous efforts.

Findings

Expected sensitivity of ±0.00013 in muon polarization measurement

Analysis of over 10^9 decay events

40-fold improvement over previous limits

Abstract

We have designed a new experiment (E923) at the BNL-AGS to search for the T-violating polarization of the muon normal to the decay plane of the KMU3 decay. The experiment aims to search for T-violation beyond the Standard Model; such a search is motivated by the need for a stronger CP violation source to account for the baryon asymmetry of the Universe. The experiment will be performed with in-flight decays from an intense (2.10e7 K/sec) 2 GeV/c separated K+ beam in an existing beam-line at the AGS. We expect to analyze more than 10e9 events to obtain the sensitivity of (delta P_t = +-0.00013) at 1 sigma, corresponding to the sensitivity of +-0.0007 to Im(xi), an improvement by 40 over the present limit on the same measurement. This paper describes the motivation for this experiment as well as other measurements of the same type. The experimental technique and the sensitivity is also described.