Exotic and nonexotic magnetic transitions in the context of the SELEX and GRAAL experiments

Abstract

We calculate magnetic transition moments in the chiral quark-soliton model, with explicit SU(3)-symmetry breaking taken into account. The dynamical model parameters are fixed by experimental data for the magnetic moments of the baryon octet and from the recent measurements of ${\Theta }^{+}$ mass. Known magnetic transition moments ${\mu }_{\Lambda \Sigma }$, ${\mu }_{N\Delta }$ are reproduced and predictions for other octet-decuplet and octet-antidecuplet transitions are given. In particular ${\mu }_{\Sigma {\Sigma }^{\ast }}$ recently constrained by SELEX is shown to be below $0.82{\mu }_N$. The recent GRAAL data on $\eta$ photoproduction off the nucleon are explained in terms of a new narrow antidecuplet neutron-like resonance.

arXiv comment14 pages, 9 figures. Final version accepted for publication in Phys.Rev.D

References in corpus (26)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Exotic Anti-Decuplet of Baryons: Prediction from Chiral Solitons
• Observation of an Exotic $S=+1$ Baryon in Exclusive Photoproduction from the Deuteron
• Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei
• Evidence for the positive-strangeness pentaquark ${\Theta }^{+}$ in photoproduction with the SAPHIR detector at ELSA
• Observation of an Exotic S = -2, Q = -2 Baryon Resonance in Proton-Proton Collisions at the CERN SPS
• Observation of an Exotic Baryon with S=+1 in Photoproduction from the Proton
• Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
• Dynamical Study of the Delta Excitation in N(e,e' pi) Reactions
• Evidence for a narrow baryonic state decaying to K0s-p and K0s-pbar in deep inelastic scattering at HERA
• Evidence for a narrow resonance at 1530 MeV/c2 in the K0 p - system of the reaction pp --> Sigma+ K0 p from the COSY-TOF experiment
• Evidence for formation of a narrow pKshort resonance with mass near 1533 MeV in neutrino interactions
• Nonstrange and other unitarity partners of the exotic Theta+ baryon
• Pentaquark in the Skyrme Model
• Chiral-Soliton Predictions for Exotic Baryons
• Z^* Resonances: Phenomenology and Models
• On photoexcitation of baryon antidecuplet
• Magnetic moments of the SU(3) decuplet baryons in the chiral quark-soliton model
• Pentaquarks
• Magnetic moments of exotic pentaquarks in the chiral quark-soliton model
• Magnetic moments of the exotic pentaquark baryons within the chiral quark-soliton model
• Extraction of the pion-nucleon sigma-term from the spectrum of exotic baryons
• Octet, decuplet and antidecuplet magnetic moments in the chiral quark soliton model revisited
• Flavor structure of the octet magnetic moments
• Upper limit on the decay Sigma(1385)- --> Sigma- gamma, and cross section for gamma Sigma- --> Lambda pi-

Cited by in corpus (26)

• Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron
• Quasi-free photoproduction of eta-mesons off the deuteron
• Photoproduction of eta-mesons on the deuteron above S11(1535) in the presence of a narrow P11(1670) resonance
• A new $N^{\ast }(1675)$ resonance in the $\gamma N\to \eta N$ reaction
• Magnetic moments of the lowest-lying singly heavy baryons
• Magnetic transitions and radiative decays of singly heavy baryons
• Sum rules for baryon decuplet magnetic moments
• New Narrow Nucleon N*(1685)
• K*Sigma photoproduction off the proton target with baryon resonances
• Heavy baryons in a pion mean-field approach: A brief review
• Axial-vector transitions and strong decays of the baryon antidecuplet in the self-consistent SU(3) chiral quark-soliton model
• eta photoproduction and N* resonances
• Vector transition form factors of the $N{K}^{\ast }\to {\Theta }^{+}$ and $N{\bar{K}}^{\ast }\to {\Sigma }_{\overline{10}}^{\ast -}$ in the SU(3) chiral quark-soliton model
• Transition magnetic moments of $J^P={\frac{3}{2}}^{+}$ decuplet to $J^P={\frac{1}{2}}^{+}$ octet baryons in the chiral constituent quark model
• $K^0\Lambda$ photoproduction off the neutron with nucleon resonances
• Quark spin content of the proton, hyperon semileptonic decays, and the decay width of the ${\Theta }^{+}$ pentaquark
• To see the exotic Theta^+ baryon from interference
• Electromagnetic transition form factors, $E2/M1$ and $C2/M1$ ratios of the baryon decuplet
• Effects of nucleon resonances on $\eta$ photoproduction off the neutron reexamined
• Feasibility study of the $K^{+}d\to K^{0}pp$ reaction for the "${\Theta }^{+}$" pentaquark
• Mass splittings of the baryon decuplet and antidecuplet with the second-order flavor symmetry breakings within a chiral soliton model
• SU(3) systematization of baryons
• Electric properties of the baryon anti-decuplet in the SU(3) chiral quark-soliton model
• Pentaquark Theta^+ production via gamma N ->K^*bar Theta^+(3/2^(+-))
• A new nucleon resonance in eta photoproduction
• New narrow nucleon resonances $N^{\ast }(1685)$ and $N^{\ast }(1726)$ within the chiral quark-soliton model