Singly and Doubly Charmed J=1/2 Baryon Spectrum from Lattice QCD
Sep, 2009
32 pages
Published in:
- Phys.Rev.D 81 (2010) 094505
e-Print:
- 0909.3294 [hep-lat]
Report number:
- JLAB-THY-09-1060,
- NT-UW-09-17
Citations per year
Abstract: (arXiv)
We compute the masses of the singly and doubly charmed baryons in full QCD using the relativistic Fermilab action for the charm quark. For the light quarks we use domain-wall fermions in the valence sector and improved Kogut-Susskind sea quarks. We use the low-lying charmonium spectrum to tune our heavy-quark action and as a guide to understanding the discretization errors associated with the heavy quark. Our results are in good agreement with experiment within our systematics. For the \Xi_{cc}, we find the isospin-averaged mass to be M_{\Xi_{cc}} = 3665 +/- 17 +/- 14 +0 -78 MeV/ the three given uncertainties are statistical, systematic and an estimate of lattice discretization errors, respectively. In addition, we predict the mass splitting of the (isospin-averaged) spin-1/2 \Omega_{cc} with the \Xi_{cc} to be M_{\Omega_{cc}} - M_{\Xi_{cc}} = 98 +/- 9 +/- 22 +/- 13 MeV (in this mass splitting, the leading discretization errors are also suppressed by SU(3) symmetry). Combining this splitting with our determination of M_{\Xi_{cc}} leads to our prediction of the spin-1/2 \Omega_{cc} mass, M_{\Omega_{cc}} = 3763 +/- 19 +/- 26 +13 -79 MeV.- 12.38.Gc
- 14.20.Lq
- heavy quark
- fermion: domain wall
- symmetry: SU(3)
- mass difference
- lattice field theory
- quantum chromodynamics
- charmed baryon: mass
- spin: 1/2
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