Isospin Violation in Hyperon Semileptonic Decays

TL;DR

This paper discusses how isospin violation causes mixing of central states in the hyperon octet, which can be measured through semileptonic decay processes, especially by accurately determining the sigma plus branching ratio.

Contribution

It highlights the significance of isospin violation-induced mixing in hyperon states and proposes measuring this effect via semileptonic decay branching ratios.

Findings

Mixing of hyperon octet states due to isospin violation.

Potential measurement of mixing through semileptonic decay branching ratios.

Emphasis on the sigma plus semileptonic decay as a key observable.

Abstract

This note emphasizes that due to isospin violation the two central states in the octet mix, and this mixing can be measured in semileptonic decays, in particular with an accurate determination of the sigma plus semileptonic branching ratio.