Experimental Results and Theoretical Developments of Muon g-2

TL;DR

This paper presents precise experimental measurements of muon g-2, compares them with standard model calculations, and discusses recent theoretical developments and discrepancies involving different data sources.

Contribution

It provides new experimental results for muon g-2 and reviews recent theoretical calculations and discrepancies, advancing understanding of muon magnetic moment anomalies.

Findings

Muon g-2 measured with 0.7 ppm precision

Discrepancy of 2.4σ with e+e- data

Discrepancy of 0.9σ with τ data

Abstract

The anomalous magnetic moments of both positive and negative muons are measured to the precision of 0.7 parts per million. Two values are in good agreement. The standard model calculations of muon g-2 are under further studies, especially the descrepancies between $e^+e^-$ and $\tau$ data. The differences between experimental result and the standard model calculations are $2.4\sigma$ for $e^+e^-$ data and $0.9\sigma$ for $\tau$ data.