Pseudo scalar meson masses in Wilson Chiral Perturbation Theory for 2+1 flavors

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We consider 2+1 flavor Wilson Chiral Perturbation Theory including the lattice spacing contributions of O(a²). We adopt a power counting appropriate for the unquenched lattice simulations carried out by the CP-PACS/JLQCD collaboration and compute the pseudo scalar meson masses to one loop. These expression are required to perform the chiral extrapolation of the CP-PACS/JLQCD lattice data.