Heavy hadron spectroscopy and the bag model

Abstract

Some time ago a slightly improved variant of bag model (the modified bag model) suitable for the unified description of light and heavy hadrons was developed. The main goal of the present work was to calculate the masses of the ground state baryons containing bottom quarks in the framework of this model. For completeness the predictions for other heavy hadrons are also given. The reasonable agreement of our results with other theoretical calculations and available experimental data suggests that our predictions could serve as a useful complementary tool for the interpretation of heavy hadron spectra.

Magnetic moments ofΞQ′−ΞQtransitions in light cone QCD

“…Our prediction for the Ξ 0− b -Ξ − b transition is very close to the results of [18] and [21], but considerably different from that of [20]. As far as the Ξ 00 c -Ξ 0 c transition is concerned, our result confirms the prediction of [19]-it is approximately 1.5 times smaller than that of [22], two times Q -Ξ 0 Q transition magnetic moments predicted by the light cone QCD sum rules (our result), effective quark mass scheme [18,19], screened quark charge scheme [18,19], bag model [20], nonrelativistic quark model [21], and chiral constituent quark model [22] approaches in units of nuclear magneton μ N . The first (second) column of [18] ( [19]) corresponds the effective quark mass (screened quark charge) scheme.…”

“…The first (second) column of [18] ( [19]) corresponds the effective quark mass (screened quark charge) scheme. larger than that of [21] and 10 times larger than the results predicted in [20]. Finally, we express our concluding remarks about the present work, in which we calculate the magnetic moments of the Ξ 00 Q -Ξ 0 Q (Q ¼ b or c) transitions within the framework of light cone QCD sum rules.…”

“…We see from these figures that the working region for β in the b-baryon case is −0.5 ≤ cos θ ≤ −0.1, and for the baryons containing c-quark, it is −0.4 ≤ cos θ ≤ 0.1. We deduce from these figures the following values for the Ξ 00 Q -Ξ 0 Q transition magnetic moments: μ Ξ 00 Table 1 we present our results on the transition magnetic moments together with the ones predicted by different approaches, such as the effective quark mass and screened quark charge scheme (for the b-hadron sector see [18], for the c-hadron sector see [19]), bag model [20], nonrelativistic quark model [21], and chiral constituent quark model [22].…”

Diagonal and transition magnetic moments of negative parity heavy baryons in QCD sum rules

“…Magnetic moments of the ground state J P = 1 2 + heavy baryons have widely been studied in literature. Furthermore, magnetic moments of the heavy baryons have been investigated in the naive quark model in [8,9], phenomenological quark model [10], relativistic three-quark model [11], variational approach [12], nonrelativistic quark model with screening and effective quark mass [13,14], nonrelativistic hypercentral model [15], chiral constituent quark model [16], chiral bag model [17], chiral perturbation theory [18], traditional QCD sum rules [19], and light cone QCD sum rules (LCSR) [20][21][22], respectively.…”

Measurements of the properties ofΛc(2595),Λc(2625),Aaltonen1, González2, Amerio3 et al. 2011Phys. Rev. D560320View full textAdd to dashboardCite

“…[10] employs QCD sum rules and Ref. [11] uses a bag model. There are a few calculations that predict the Σ c (2455) natural width in the region of 1-3 MeV/c 2 [12][13][14][15][16][17] and the Σ c (2520) width to be about 18 MeV/c 2 [17].…”