Pentaquarks: Review on Models and Solitonic Calculations of Antidecuplet Magnetic Moments

Abstract

After a quick look at the present status of experiments we shortly review in a first step the ongoing discussions on some of the basic theoretical approaches to pentaquarks: Chiral solitons, Large-$N_c$ considerations, quark models, and lattice gauge approaches. In a second step we apply the chiral quark-soliton approach including linear $m_s$-corrections to the calculation of magnetic moments of the baryons of the anti-decuplet. In this approach the parameters are fixed solely by experimental data for the magnetic moments of the baryon octet and for the masses of the octet, decuplet and of ${\Theta }^{+}$. The magnetic moment of ${\Theta }^{+}$ depends rather strongly on the pion-nucleon sigma term and reads $-1.19n.m.$ to $-0.33n.m.$ for ${\Sigma }_{\pi N}=45$ and 75 MeV respectively. As a byproduct the strange magnetic moment of the nucleon is obtained with a value of ${\mu }_N^{(s)}=+0.39$ n.m.

24 pages, 2 figures, To be published in Prog.Part. Nucl. Phys

References in corpus (25)

• Observation of an Exotic S = -2, Q = -2 Baryon Resonance in Proton-Proton Collisions at the CERN SPS
• Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction
• A Diquark-Triquark Model for the KN Pentaquark
• Evidence for a narrow baryonic state decaying to K0s-p and K0s-pbar in deep inelastic scattering at HERA
• Pentaquark hadrons from lattice QCD
• Nonstrange and other unitarity partners of the exotic Theta+ baryon
• Chiral-Soliton Predictions for Exotic Baryons
• A schematic model for pentaquarks based on diquarks
• Is Theta+(1540) a Kaon--Skyrmion Resonance?
• Where are the missing members of the baryon antidecuplet?
• Exotic Theta^+ baryon production induced by a photon and a pion
• Positive Parity Pentaquarks Pragmatically Predicted
• Pentaquark Magnetic Moments In Different Models
• The width of ${\Theta }^{+}$ for large $N_c$ in chiral quark soliton model
• Exotic baryon multiplets at large number of colours
• 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
• Study the exotic ${\Theta }^{+}$ with polarized photon beams
• Octet, decuplet and antidecuplet magnetic moments in the chiral quark soliton model revisited
• Pentaquark spectrum in string dynamics
• Exotic baryons and the large-Nc expansion
• Magnetic Moment of The ${\Theta }^{+}$ Pentaquark State
• Magnetic moments of antidecuplet pentaquarks
• Dynamical study of the pentaquark antidecuplet
• A Diquark Chiral Effective Theory and Exotic Baryons

Cited by in corpus (13)

• Pentaquark and Tetraquark states
• Search for Theta+ via pi- p --> K- X reaction near production threshold
• Search for the ${\Theta }^{+}$ pentaquark via the ${\pi }^{-}p\to K^{-}X$ reaction at 1.92 GeV/$c$
• Search for Theta+ via K+p -> pi+X reaction with a 1.2 GeV/c K+ beam
• ${\gamma }^{\ast }N\to N(1710)$ transition at high momentum transfer
• Axial-vector transitions and strong decays of the baryon antidecuplet in the self-consistent SU(3) chiral quark-soliton model
• Quark spin content of the proton, hyperon semileptonic decays, and the decay width of the ${\Theta }^{+}$ pentaquark
• Systematic study of pentaquark states: $qqq-q\bar{q}$ configuration
• Electric properties of the baryon anti-decuplet in the SU(3) chiral quark-soliton model
• Photoproduction of Pentaquark ${\Theta }^{+}$ and Chiral Symmetry Restoration in Hot and Dense Medium
• Vector and axial-vector structures of the Theta^+
• Photoproduction of Theta^+(1540,1/2^+) reexamined with new theoretical information
• Photoproduction of the Theta^+ and its vector and axial-vector structure