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Masses and decay constants of the η and η′ mesons from lattice QCD

URN to cite this document:
urn:nbn:de:bvb:355-epub-517412
DOI to cite this document:
10.5283/epub.51741
Bali, Gunnar S. ; Braun, Vladimir M. ; Collins, Sara ; Schäfer, Andreas ; Simeth, Jakob
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Date of publication of this fulltext: 20 Feb 2022 14:33



Abstract

We determine the masses, the singlet and octet decay constants as well as the anomalous matrix elements of the η and η′ mesons in Nf = 2 + 1 QCD. The results are obtained using twenty-one CLS ensembles of non-perturbatively improved Wilson fermions that span four lattice spacings ranging from a ≈ 0.086 fm down to a ≈ 0.050 fm. The pion masses vary from Mπ = 420 MeV to 126 MeV and the spatial ...

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