Phenomenology of spin 3/2 baryons with pentaquarks

作者：Hyodo T^*; Hosaka A

来源：Physical Review D – Particles and Fields, 2005, 71(5): 054017.

DOI：10.1103/PhysRevD.71.054017

We examine several assignments of spin and parity for the pentaquark Theta(+) state (J(P) = 1/2 (+/-), 3/2(+/-)) in connection with known baryon resonances. Assuming that the Theta(+) belongs to an antidecuplet representation which mixes with an octet, we calculate the mass spectra of the flavor partners of the Theta(+) based on the SU(3) symmetry. The decay widths of the Theta(+) and nucleon partners are analyzed for the consistency check of the mixing angle obtained from the masses. It is found that a suitable choice of the mixing angle successfully reproduces the observed masses of Theta(1540) and Xi(3/2)(1860), when their spin and parity are assigned to be J(P) = 3/2(-), together with other J(P) = 3/2(-) resonances. The decay widths of Theta --> KN, N(1520) --> pi N, and N(1700) --> pi N are also reproduced simultaneously.

• 出版日期2005-3