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29 March 2024
 
  » arxiv » 1510.5267

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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
AbstractWe 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
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