2015/10/31 by Qiang Mao, Hua-Xing Chen, Wei Chen +3 · 2 citations
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.92.114007
published as Phys. Rev. D 92, 114007 (2015) · 9 pages, 7 figures, 1 table, accepted by PRD
arxiv created 2015/11/24 · arxiv updated 2015/12/03
We study the P-wave bottom baryons using the method of QCD sum rule and heavy quark effective theory. Our results suggest that Lambdab(5912) and Lambdab(5920) can be well described by the baryon doublet [3Fbar, 1, 1, rho], and they belong to the SU(3) 3Fbar multiplets of J(P)=1/2(-) and 3/2(-). Their SU(3) flavor partners, Xib(1/2-) and Xib(3/2-), have masses 6.06 ± 0.13 GeV and 6.07 ± 0.13 GeV, respectively, with mass splitting 9 ± 4 MeV. The results obtained using baryon doublet [3Fbar, 1, 0, lambda] are similar and also consistent with the experimental data. We also study the SU(3) 6F multiplets by using the baryon multiplets [6F, 0, 1, lambda], [6F, 1, 0, rho] and [6F, 2, 1, lambda], and our results suggest that the P-wave bottom baryons Sigmab, Xi'b and Omegab have (averaged) masses about 6.0 GeV, 6.2 GeV and 6.4 GeV, respectively.