On uplimit of accurate measurement of tau mass

TL;DR

This paper discusses the current limits of measuring the tau lepton mass accurately, highlighting that existing methods are nearing their precision ceiling and suggesting the need for new approaches for further improvement.

Contribution

It analyzes the limitations of current measurement techniques and luminosity, emphasizing that the precision of tau mass measurement is approaching its fundamental upper limit.

Findings

Current measurement accuracy is better than 10^-4.

Existing techniques are nearing their precision limit.

New methods are required for further improvements.

Abstract

Tau lepton as one of three elementary leptons in nature, the measurement of its mass has ever been performed since its discovery. The present relative accuracy is already at the level of better than 10 to minus 4 and more effects are still made in order to increase the accuracy further. However, the analysis of available techniques for and expectable luminosity from e+e- collider indicates that the precision uplimit of tau mass is almost reached, which means that brand new approaches should be looked for if the great improvement is yearned for.