A note on the mass splitting of K*(892)

TL;DR

This paper examines the mass difference between K*(892) mesons, motivated by new experimental data, and finds theoretical support for the recent Belle Collaboration measurement, emphasizing the need for further experiments.

Contribution

It provides a theoretical analysis favoring the new Belle measurement of K*(892) mass splitting, updating previous understanding based on recent data.

Findings

Theoretical estimation supports Belle's new measurement.

Further experimental data is needed to clarify the mass splitting.

The study emphasizes the importance of precise measurements for meson properties.

Abstract

Belle Collaboration reported a new observed value of K*-(892) mass by studying tau --> K_S pi nu_tau decay, which is significantly different from the current world average value given by Particle Data Group 2006. Motivated by this new data, we revisit the issue on the K*0(892)-K*+(892) mass splitting. Our theoretical estimation favors the new measurement by Belle Collaboration. Therefore further experimental efforts are urgently needed to improve our understanding of these issues.