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

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Bali, Gunnar S. ; Braun, Vladimir M. ; Collins, Sara ; Schäfer, Andreas ; Simeth, Jakob
License: Creative Commons Attribution 4.0
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Date of publication of this fulltext: 20 Feb 2022 14:33


We determine the masses, the singlet and octet decay constants as well as the anomalous matrix elements of the eta and eta ' mesons in N-f = 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 approximate to 0.086 fm down to a approximate to 0.050 fm. The pion masses vary from M-pi = 420 ...


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