Phenomenological study of two-meson couplings of Θ+ -: art. no. 055202

We evaluate two-meson couplings of Theta(+), using experimental information of nucleon resonances decaying into pi pi N channels, in which the two pions are in scalar- and vector-type correlations. We examine two assignments of spin and parity of J(P)=1/2(+) and 3/2(-), for which the experimental spectra of known resonances with exotic baryons are properly reproduced by an octet-antidecuplet representation mixing scheme. With the obtained coupling constants, total cross sections of the reactions pi(-)p -> K-Theta(+) and K(+)p ->pi(+)Theta(+) are calculated. Substantial interference of two terms may occur in the reaction processes for the J(P)=1/2(+) case, whereas the interference effect is rather small for the 3/2(-) case.