Prediction of the Omegabbb mass from lattice QCD
Abstract
The mass of the triply heavy baryon Omegabbb is calculated in lattice QCD with 2+1 flavors of light sea quarks. The b quark is implemented with improved lattice NRQCD. Gauge field ensembles from both the RBC/UKQCD and MILC collaborations with lattice spacings in the range from 0.08 fm to 0.12 fm are used. The final result for the Omegabbb mass, which includes an electrostatic correction, is 14.371+-0.004(stat)+-0.011(syst)+-0.001(exp) GeV. The hyperfine splitting between the physical J=3/2 state and a fictitious J=1/2 state is also calculated.
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