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Physical Review D
We study the properties of pions in twisted mass lattice QCD (with two degenerate flavors) using chiral perturbation theory (ChPT). We work to next-to-leading order (NLO) in a power counting scheme in which m_q ~ a \Lambda_QCD^2, with m_q the physical quark mass and a the lattice spacing. We argue that automatic O(a) improvement of physical quantities at maximal twist, which has been demonstrated in general if m_q >> a \Lambda_QCD^2, holds even if m_q ~ a \Lambda_QCD^2, as long as one uses andoi:10.1103/physrevd.71.074501 fatcat:cjgfuuzbmfc7pa5rru6r3zwxvq