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• W2018308441 abstract "We calculate isospin 2 pion-pion scattering in chiral perturbation theory for a partially quenched, mixed action theory with Ginsparg-Wilson valence quarks and staggered sea quarks. We point out that for some scattering channels, the power-law volume dependence of two-pion states in nonunitary theories such as partially quenched or mixed action QCD is identical to that of QCD. Thus one can extract infinite-volume scattering parameters from mixed action simulations. We then determine the scattering length for both 2 and $2+1$ sea quarks in the isospin limit. The scattering length, when expressed in terms of the pion mass and the decay constant measured on the lattice, has no contributions from mixed valence-sea mesons, thus it does not depend upon the parameter, ${C}_{mathrm{Mix}}$, that appears in the chiral Lagrangian of the mixed theory. In addition, the contributions which nominally arise from operators appearing in the mixed action $mathcal{O}({a}^{2}{m}_{q})$ Lagrangian exactly cancel when the scattering length is written in this form. This is in contrast to the scattering length expressed in terms of the bare parameters of the chiral Lagrangian, which explicitly exhibits all the sicknesses and lattice spacing dependence allowed by a partially quenched mixed action theory. These results hold for both 2 and $2+1$ flavors of sea quarks." @default.
• W2018308441 created "2016-06-24" @default.
• W2018308441 creator A5011816116 @default.
• W2018308441 creator A5076453211 @default.
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• W2018308441 date "2006-04-24" @default.
• W2018308441 modified "2023-09-25" @default.
• W2018308441 title "Ginsparg-Wilson pions scattering in a sea of staggered quarks" @default.
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• W2018308441 doi "https://doi.org/10.1103/physrevd.73.074510" @default.
• W2018308441 hasPublicationYear "2006" @default.
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