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# Search for new mesons in the omegaeta and omegapi 0 systems produced in the reaction pi-p to pi +pi-4gamma n at 18 GeV/c

#### Abstract

Results are presented on a study of resonant structure in the $\omega\pi\sp0$ and $\omega\eta$ final states produced in $\pi\sp-p$ interactions at 18 GeV/c where $\omega\to \pi\sp+\pi\sp-\pi\sp0,\ \pi\sp0\to 2\gamma,$ and $\eta\to 2\gamma.$ Final states such as $\omega\pi\sp0$ and $\omega\eta,$ which contain a vector meson are allowed in the extended flux-tube model for the decay of hybrid mesons. For the $\omega\eta$ final state, the data exhibit the well-known $b\sb1$(1235) and $\rho\sb3$(1690) resonances. A one-pion exchange mechanism is clearly seen for the $\rho\sb3$(1690). The result of a partial wave analysis for the $\omega\eta$ final state finds a new $1\sp{+-}$ meson state $h\sb1$(1540) with a mass $M = 1542\pm 13$ MeV and a width $\Gamma = 285\pm 30$ MeV, which shows phase motion relative to the $\omega$(1600). The decay mode of $\omega(1600)\to \omega\eta$ has not been previously reported. ^

#### Subject Area

Physics, Nuclear|Physics, Elementary Particles and High Energy

#### Recommended Citation

Paul Michael Eugenio, "Search for new mesons in the omegaeta and omegapi 0 systems produced in the reaction pi-p to pi +pi-4gamma n at 18 GeV/c" (January 1, 1998). Electronic Doctoral Dissertations for UMass Amherst. Paper AAI9841866.
http://scholarworks.umass.edu/dissertations/AAI9841866

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