etapi and eta'pi spectra and interpretation of possible exotic JPC=1-+ mesons

Phys Rev Lett. 2003 Aug 29;91(9):092002. doi: 10.1103/PhysRevLett.91.092002. Epub 2003 Aug 27.

Abstract

We discuss a coupled channel analysis of the etapi and eta'pi systems produced in pi(-)p interactions at 18 GeV/c. We show that known Q(-)Q resonances, together with residual soft meson-meson rescattering, saturate the spectra including the exotic J(PC)=1(-+) channel. The possibility of a narrow exotic resonance at a mass near 1.6 GeV/c(2) cannot, however, be ruled out.