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We present the results of a calculation of the positive-parity ground-statecharmed-baryon spectrum using 2+1+1 flavors of dynamical quarks. Thecalculation uses a relativistic heavy-quark action for the valence charm quark,clover-Wilson fermions for the valence light and strange quarks, and HISQ seaquarks. The spectrum is calculated with a lightest pion mass around 220 MeV,and three lattice spacings (a \approx 0.12 fm, 0.09 fm, and 0.06 fm) are usedto extrapolate to the continuum. The light-quark mass extrapolation isperformed using heavy-hadron chiral perturbation theory up to O(m_pi^3) and atnext-to-leading order in the heavy-quark mass. For the well-measured charmedbaryons, our results show consistency with the experimental values. For thecontroversial J=1/2 Xi_{cc}, we obtain the isospin-averaged valueM_{Xi_{cc}}=3595(39)(20)(6) MeV (the three uncertainties are statistics,fitting-window systematic, and systematics from other lattice artifacts, suchas lattice scale setting and pion-mass determination), which shows a 1.7 sigmadeviation from the experimental value. We predict the yet-to-be-discovereddoubly and triply charmed baryons Xi_{cc}^*, Omega_{cc}, Omega_{cc}^* andOmega_{ccc} to have masses 3648(42)(18)(7) MeV, 3679(40)(17)(5) MeV,3765(43)(17)(5) MeV and 4761(52)(21)(6) MeV, respectively.

Charmed-Baryon Spectroscopy from Lattice QCD with N_f=2+1+1 Flavors