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The hadron spectrum of one flavor QCD is studied by Monte Carlo simulations.The Symanzik tree-level-improved Wilson action is used for the gauge field andthe Wilson action for the fermion. The theory is simulated by a polynomialhybrid Monte Carlo algorithm (PHMC). The mass spectrum of hadronic bound statesis investigated at two different lattice spacings: a ~ 0.37r_0 and a ~ 0.27r_0,corresponding to ~0.19fm and ~0.13fm in ordinary QCD. The lattice extension isfixed to L ~ 4.4r_0 (~2.2fm). The lightest simulated quark mass corresponds toa pion with mass ~270MeV. Properties of the theory are analyzed by making useof the ideas of partially quenched chiral perturbation theory (PQChPT). Thesymmetry of the single flavor theory can be artificially enhanced by addingextra valence quarks, which can be interpreted as u and d quarks. Operators inthe valence pion sector can be built. Masses and decay constants are analyzedby using PQChPT formulae at next-to-leading order.

Hadron spectrum of QCD with one quark flavor