Abstract
We study the effects of a finite cubic volume with twisted boundary conditions on pseudoscalar mesons. We first apply chiral perturbation theory in the p-regime and calculate the corrections for masses, decay constants, pseudoscalar coupling constants and form factors at next-to-leading order. We show that the Feynman-Hellmann theorem and the relevant Ward-Takahashi identity are satisfied. We then derive asymptotic formulae à la Lüscher for twisted boundary conditions. We show that chiral Ward identities for masses and decay constants are satisfied by the asymptotic formulae in finite volume as a consequence of infinite-volume Ward identities. Applying asymptotic formulae in combination with chiral perturbation theory we estimate corrections beyond next-to-leading order for twisted boundary conditions.
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Colangelo, G., Vaghi, A. Pseudoscalar mesons in a finite cubic volume with twisted boundary conditions. J. High Energ. Phys. 2016, 134 (2016). https://doi.org/10.1007/JHEP07(2016)134
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DOI: https://doi.org/10.1007/JHEP07(2016)134