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arXiv · 1504.02573

Masses and decay constants of pions and kaons in mixed-action staggered chiral perturbation theory

Jon A. Bailey·Hyung-Jin Kim·Jongjeong Kim·Weonjong Lee·Boram Yoon
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Abstract

Lattice QCD calculations with different staggered valence and sea quarks can be used to improve determinations of quark masses, Gasser-Leutwyler couplings, and other parameters relevant to phenomenology. We calculate the masses and decay constants of flavored pions and kaons through next-to-leading order in staggered-valence, staggered-sea mixed-action chiral perturbation theory. We present the results in the valence-valence and valence-sea sectors, for all tastes. As in unmixed theories, the taste-pseudoscalar, valence-valence mesons are exact Goldstone bosons in the chiral limit, at non-zero lattice spacing. The results reduce correctly when the valence and sea quark actions are identical, connect smoothly to the continuum limit, and provide a way to control light quark and gluon discretization errors in lattice calculations performed with different staggered actions for the valence and sea quarks.

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Jon A. Bailey, Hyung-Jin Kim, Jongjeong Kim, Weonjong Lee, Boram Yoon. 2015-04-10. Masses and decay constants of pions and kaons in mixed-action staggered chiral perturbation theory. https://doi.org/10.1103/physrevd.96.034522

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