Charmedbaryon spectroscopy from lattice QCD with N_{f}=2+1+1 flavors
Abstract
We present the results of a calculation of the positiveparity groundstate charmedbaryon spectrum using 2+1+1 flavors of dynamical quarks. The calculation uses a relativistic heavyquark action for the valence charm quark, cloverWilson fermions for the valence light and strange quarks, and highly improved staggered sea quarks. The spectrum is calculated with a lightest pion mass around 220 MeV, and three lattice spacings (a≈0.12, 0.09, and 0.06 fm) are used to extrapolate to the continuum. The lightquark mass extrapolation is performed using heavyhadron chiral perturbation theory up to O(m_{π}^{3}) and at nexttoleading order in the heavyquark mass. For the wellmeasured charmed baryons, our results show consistency with the experimental values. For the controversial J=1/2Ξ_{cc}, we obtain the isospinaveraged value m_{Ξcc}=3595(39)(20)(6)MeV (the three uncertainties are statistics, fittingwindow systematic, and systematics from other lattice artifacts, such as lattice scale setting and pionmass determination), which shows a 1.7σ deviation from the experimental value. We predict the yettobediscovered doubly and triply charmed baryons Ξ_{cc}^{*}, Ω_{cc}, Ω_{cc}^{*} and Ω_{ccc} to have masses 3648(42)(18)(7), 3679(40)(17)(5), 3765(43)(17)(5), and 4761(52)(21)(6) MeV, respectively.
 Publication:

Physical Review D
 Pub Date:
 November 2012
 DOI:
 10.1103/PhysRevD.86.094504
 arXiv:
 arXiv:1207.3536
 Bibcode:
 2012PhRvD..86i4504B
 Keywords:

 12.38.Gc;
 11.15.Ha;
 12.39.Hg;
 Lattice QCD calculations;
 Lattice gauge theory;
 Heavy quark effective theory;
 High Energy Physics  Lattice;
 High Energy Physics  Phenomenology
 EPrint:
 23 pages, 14 figures