Speaker
Jakob Simeth
(University of Regensburg)
Description
We present results for $\eta$ and $\eta^\prime$ masses and their four independent decay constants, determined directly from the axialvector channels.
We perform our analysis on the CLS 2+1 flavour ensembles, from pion masses of 420 MeV down to the physical mass point. Four lattice spacings and two distinct mass trajectories allow to take the continuum limit and chiral interpolation with care, providing first results for some of the from phenomenology lesser known low energy constants that appear in NLO large-$N_c$ ChPT.
As a by-product, we test the flavour-singlet PCAC relation, probing the purely gluonic contribution to the singlet decay constants.
Authors
Gunnar Bali
(Universität Regensburg)
Jakob Simeth
(University of Regensburg)
Sara Collins
(University of Regensburg)
