Chiral perturbation theory for pentaquark baryons and its applications

Abstract

We construct a chiral lagrangian for pentaquark baryons assuming that the recently found Theta^+ (1540) state belongs to an antidecuplet of SU(3) flavor symmetry with J^P = (1/2)^(+-). We derive the Gell-Mann-Okubo formulae for the antidecuplet baryon masses, and a possible mixing between the antidecuplet and the pentaquark octet. Then we calculate the cross sections for pi^- p -> K^- Theta^+ and gamma n -> K^- Theta^+ using our chiral lagrangian. The resulting amplitudes respect the underlying chiral symmetry of QCD correctly. We also describe how to include the light vector mesons in the chiral lagrangian.

4 pages

References in corpus (3)

• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• 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

Cited by in corpus (6)

• Analysis of $P_c^{+}(4380)$ and $P_c^{+}(4450)$ as pentaquark states in the molecular picture with QCD sum rules
• Pentaquark Theta^+(1540) production in gamma N --> K Anti-K N
• Suppression of Theta^+(J^P=3/2^(+,-)) photoproduction from the proton
• High-resolution search for the ${\Theta }^{+}$ pentaquark via a pion-induced reaction at J-PARC
• Comparative Regge analysis of $\Lambda ,{\Sigma }^0,\Lambda (1520)$ and ${\Theta }^{+}$ production in $\gamma p$, $\pi p$ and $pp$ reactions
• Two-meson cloud contribution to the baryon antidecuplet binding