Work

η and η ′ mesons from N f = 2 + 1 lattice QCD at the physical point using topological charge operators

Year: 2025

Type: article

Abstract: By fitting the two-point correlation functions of topological charge density operators calculated on two 2 + 1 -flavor gauge ensembles with physical pion mass, we determine both the η and η ′ masses and also the mixing angle to be m η = 0.505 ( 72 ) ( 75 ) GeV , m η ′ = 0.952 ( 47 ) ( 40 ) GeV , and θ 1 = − 8.9 ( 2.1 ) ( 1.8 ) ° , respectively, where the first error is the statistical uncertainty and the second one is the systematic uncertainty. This is the first extraction of both η / η ′ masses and the mixing angle θ 1 using topological charge operators. Compared with previous studies using quark bilinear operators, the error of the η mass is relatively large, but the mixing angle has comparable precision. This demonstrates that the topological charge operators are well suited to study the η and η ′ mesons.

Source: Physical review. D/Physical review. D.

DOI: 10.1103/cmzr-h8kx

Authors: Yue Su, Nan Wang, Long-cheng Gui, Jun Hua, Jian Liang, Jun Shi

Institutions: Tianjin University, Hunan Normal University, South China Normal University

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid