Nonstrange-Resonance Production inπ+pCollisions at 2.35, 2.62, and 2.90 BeV/c

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Abstract

In an exposure of the Brookhaven National Laboratory 20-in. hydrogen bubble chamber to a separated ${\ensuremath{\pi}}^{+}$ beam at ${\ensuremath{\pi}}^{+}$ momenta of 2.35 BeV/c (center-of-mass energy ${E}^{*}=2.30$ BeV), 2.62 BeV/c (${E}^{*}=2.41$ BeV), and 2.90 BeV/c (${E}^{*}=2.52$ BeV), we have observed production of the ${\ensuremath{\omega}}^{0}$, ${\ensuremath{\rho}}^{0}$, and ${\ensuremath{\eta}}^{0}$ mesons. The production of the ${\ensuremath{\omega}}^{0}$, ${\ensuremath{\rho}}^{0}$, and ${\ensuremath{\eta}}^{0}$ is often accompanied by simultaneous production of the ${N}^{*++}$. The momentum transfer in ${\ensuremath{\omega}}^{0}$ and ${\ensuremath{\rho}}^{0}$ production is characteristic of peripheral collisions and suggests a single-particle exchange for the production mechanism. The decay distributions for the ${\ensuremath{\omega}}^{0}$, ${\ensuremath{\rho}}^{0}$, and the ${\ensuremath{\rho}}^{+}$ demonstrate the importance of modifying the single-particle-exchange model to include absorptive effects. An upper limit on the two-$\ensuremath{\pi}$ decay of the ${\ensuremath{\omega}}^{0}$ is set at 2%. The width of the ${\ensuremath{\eta}}^{0}$ is found to be less than 10 MeV. Elastic-scattering distributions are presented.

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