Chiral perturbation theory for pentaquark baryons and its applications

Details Chiral perturbation theory for pentaquark baryons and its applications Chiral perturbation theory for pentaquark baryons and its applications

2003-12-11

arxiv.org/abs/hep-ph/0312147v1

Phys.Lett. B611 (2005) 87-92

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages

Scientific paper

10.1016/j.physletb.2005.02.031

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.

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