Spectrum and Bethe-Salpeter amplitudes of Ω baryons from lattice QCD
- Received Date: 2015-11-17
- Accepted Date: 2015-11-25
- Available Online: 2016-03-28
Abstract: The Ω baryons with JP=3/2±, 1/2± are studied on the lattice in the quenched approximation. Their mass levels are ordered as M3/2+<M3/2-≈M1/2-<M1/2+, as is expected from the constituent quark model. The mass values are also close to those of the four Ω states observed in experiments. We calculate the Bethe-Salpeter amplitudes of Ω(3/2+) and Ω(1/2+) and find there is a radial node for the Ω(1/2+) Bethe-Salpeter amplitude, which may imply that Ω(1/2+) is an orbital excitation of Ω baryons as a member of the(D, LNP)=(70, 02+) supermultiplet in the SU(6)⊗O(3) quark model description. Our results are helpful for identifying the quantum numbers of experimentally observed Ω states.