2011/11/04 by Briceño, Raúl A., Bolton, Daniel, Lin, Huey-Wen · 4 citations
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat)
paper · doi:10.48550/arxiv.1111.1028
We present preliminary results of the calculation of the positive-parity ground state charm baryon spectrum using of Nf=2+1+1 dynamical quarks. The calculation uses a relativistic heavy-quark action for the valence charm quark, clover-Wilson fermions for the valence light quarks and HISQ sea quarks. The spectrum is calculated with a lightest pion mass around 220 MeV and two lattice spacings (a∼0.12 fm and 0.09 fm) are used to extrapolate to continuum limit. Our preliminary results are consistent with the currently measured baryon spectrum, except for the isospin-averaged J=1/2 Ξcc which is approximately 2 σ above the SELEX observed value. We predict the yet-to-be-discovered double and triple-charm baryons Ξcc^*, Ωcc, Ωcc^*, Ωccc to have masses 3665(42)(29) MeV, 3694(40)(45) MeV, 3739(35)(21) MeV and 4782(24)(28) MeV, respectively.