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We calculate the light hadron spectrum in full QCD using two plus one flavorAsqtad sea quarks and domain wall valence quarks. Meson and baryon masses arecalculated on a lattice of spatial size $L \approx 2.5$\texttt{fm}, and alattice spacing of $a \approx 0.124$\texttt{fm}, for pion masses as light as$m_\pi \approx 300$\texttt{MeV}, and compared with the results by the MILCcollaboration with Asqtad valence quarks at the same lattice spacing. Two- andthree-flavor chiral extrapolations of the baryon masses are performed usingboth continuum and mixed-action heavy baryon chiral perturbation theory. Boththe three-flavor and two-flavor functional forms describe our lattice results,although the low-energy constants from the next-to-leading order SU(3) fits areinconsistent with their phenomenological values. Next-to-next-to-leading orderSU(2) continuum formulae provide a good fit to the data and yield andextrapolated nucleon mass consistent with experiment, but the convergencepattern indicates that even our lightest pion mass may be at the upper end ofthe chiral regime. Surprisingly, our nucleon masses are essentially lineaer in$m_\pi$ over our full range of pion masses, and we show this feature is commonto all recent dynamical calculations of the nucleon mass. The origin of thislinearity is not presently understood, and lighter pion masses and increasedcontrol of systematic errors will be needed to resolve this puzzling behavior.

Light hadron spectroscopy using domain wall valence quarks on an Asqtad sea