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A QCD sum rule calculation for P-wave bottom baryons | Qiang Mao
; Hua-Xing Chen
; Wei Chen
; Atsushi Hosaka
; Xiang Liu
; Shi-Lin Zhu
; | Date: |
18 Oct 2015 | Abstract: | We study the P-wave bottom baryons using the method of QCD sum rule and heavy
quark effective theory. Our results suggest that Lambda_b(5912) and
Lambda_b(5920) can be well described by the baryon doublet [3F_bar, 1, 1, rho],
and they belong to the SU(3) 3F_bar multiplets of J(P)=1/2(-) and 3/2(-). Their
SU(3) flavor partners, Xi_b(1/2-) and Xi_b(3/2-), have masses 6.06 pm 0.13 GeV
and 6.07 pm 0.13 GeV, respectively, with mass splitting 9 pm 4 MeV. The
results obtained using baryon doublet [3F_bar, 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], [6_F, 1, 0, rho]
and [6F, 2, 1, lambda], and our results suggest that the $P$-wave bottom
baryons Sigma_b, Xi’_b and Omega_b have (averaged) masses about 6.0 GeV, 6.2
GeV and 6.4 GeV, respectively. | Source: | arXiv, 1510.5267 | Services: | Forum | Review | PDF | Favorites |
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