Determination of the $\Sigma$--$\Lambda$ mixing angle from QCD sum rules

TL;DR

This paper calculates the $\,\Sigma$--$\,\Lambda$ mixing angle using QCD sum rules, finding a value consistent with quark models but larger than recent lattice QCD results.

Contribution

The paper provides a QCD sum rule-based calculation of the $\,\Sigma$--$\,\Lambda$ mixing angle, offering a comparison with other theoretical approaches.

Findings

Mixing angle predicted as (1.00 ± 0.15) degrees.

Result agrees with quark model predictions.

Value is about twice as large as recent lattice QCD results.

Abstract

The $\Sigma$--$\Lambda$ mixing angle is calculated in framework of the QCD sum rules. We find that our prediction for the mixing angle is $(1.00\pm 0.15)^0$ which is in good agreement with the quark model prediction, and approximately two times larger than the recent lattice QCD calculations.