arXiv subjects

Bin Wu

Publications and source records attributed to Bin Wu.

292 records · Page 17Linked to original sources

arXiv2004

The 35-plet Baryons from Chiral Soliton Models

We investigate the 35-plet baryons from the chiral soliton models. We find that the coupling constant for the decay of 35-plet baryons with spin 3/2 to the decuplet baryons is surprisingly small, but that for the decay to 27-plet baryons with spin 3/2 is larger. We give all the masses and widths of 35-plet baryons with spin 5/2 and suggest candidates for all nonexotic members from the available particle listings. We also focus on $Δ_{5/2}$ and $Θ_2$, which are the lightest two baryons of 35-plet with spin 5/2 and with simplest minimal pentaquark configurations. Calculations show that $Γ_{Δ_{5/2}}<$380 MeV, compared with the results from SU(2) Skyrme Model ($Γ_{Δ_{5/2}}>$800 MeV), and $Γ_{Θ_{2}}<100$ MeV if we assume that their widths are dominated by two-body decay and that $Θ^+$ has a width $Γ_{Θ^+}<25$ MeV.

hep-ph↗

arXiv2004

Parity of Anti-Decuplet Baryons Revisited from Chiral Soliton Models

We recalculate masses and widths of anti-decuplet baryons in the case of positive parity from chiral soliton models, provided that the member $Ξ_{3/2}$ of the anti-decuplet has a mass 1.86 GeV as reported recently. Calculations show that there are no convincing candidates for the nonexotic members of the anti-decuplet available in the baryon listings. Up to the leading order of $m_s$ and 1/$N_c$, the width formula for the decay of the anti-decuplet baryons to the octet depends only on SU(3) symmetry model-independently, except the coupling constant. Similarly we give a width formula for the decay of negative parity baryons belong to certain SU(3) baryon multiplet by pure symmetry consideration. By this formula, we find that if we have an anti-decuplet with negative parity and that the masses are the same as those given by chiral soltion models, the identification of N(1650) as $N_{\bar{10}}$ are inconsistent with experiments for $N(1650)\to Nπ$ while the widths agree with other two decay channels involving strangeness. And $Σ(1750)$ seems to be a reasonable candidate for $Σ_{\bar{10}}$.

hep-ph↗

arXiv2004

The 27-plet Baryons from Chiral Soliton Models

We use the perturbation method to calculate the masses and widths for 27-plet baryons with spin 3/2 from chiral soliton models. According to the masses and quantum numbers, we find all the candidates for non-exotic members of 27-plet. The calculation of the widths shows that these candidates manifest an approximate symmetry of the 27 representation of the SU(3) group, and the quantum numbers of $Ξ(1950)$ seem to be $I(J^P)={1/2}({3/2}^+)$. Up to leading order of the strange quark mass, we find that the exotic members have widths much larger than those of the anti-decuplet members.

hep-ph↗

arXiv2004

Pentaquark $Θ^*$ States in {27} Baryon Multiplet from Chiral Soliton Model

We estimate the mass and the width of pentaquark $Θ^*$ states in the 27-plet from chiral soliton models. The calculations show that the mass of $Θ^*$ is about 1.60 GeV and the width for the process $Θ^*\to {KN}$ is less than 43 MeV. We also discuss the search for the existence of $Θ^*$ states in physical processes.

hep-ph↗