2015/03/31 by Gunnar Bali, Sara Collins, Paula Pérez-Rubio · 119 citations
Physics and Astronomy · #Atomic physics #Baryon #Charm quark #Charmed baryons #Excited state #Fermion #High-Energy Particle Collisions Research #Hyperfine structure #Lattice QCD #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quark #Strange quark #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevd.92.034504
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 92(3) (American Physical Society) · 35 pages, 14 tables, 20 figures. Published version, added figures, small changes to text
openalex publication_date 2015/08/04 · arxiv created 2015/08/13 · arxiv updated 2015/08/14 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We determine the ground state and first excited state masses of singly and doubly charmed spin 1/2 and 3/2 baryons with positive and negative parity. Configurations with Nf=2+1 nonperturbatively improved Wilson-clover fermions were employed, with the same quark action also being used for the valence quarks, including the charm. The spectrum is calculated for pion masses in the range M_\ensuremathπ\ensuremath∼259--460 MeV at a lattice spacing a\ensuremath∼0.075 fm. Finite volume effects are studied comparing lattices with two different linear spatial extents (1.8 fm and 2.4 fm). The physical point is approached from the SU(3) limit keeping the flavor averaged light quark mass fixed. The baryon masses are extrapolated using expansions in the strange-light quark mass difference. Most particles fall into the expected SU(3) multiplets with well-constrained extrapolations, the exceptions having a possibly more complex internal structure. Overall agreement is found with experiment for the masses and splittings of the singly charmed baryons. As part of the calculation an analysis of the lower lying charmonium, D and Ds spectra was performed in order to assess discretization errors. The gross spectra are reproduced, including the Ds0*, Ds1 and D1 mesons, while at this single lattice spacing hyperfine splittings come out 10--20 MeV too low.