ON PION-P CHARGE EXCHANGE POLARIZATION AND THE POSSIBILITY OF A SECOND RHO-MESON,
ILLINOIS UNIV URBANA DEPT OF PHYSICS
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The pion-proton exchange CEX reaction, negative-pion p to neutral-pion n at high energies is a particularly simple reaction from the standpoint of Regge pole phenomenology because only the quantum numbers of the rho-meson may be exchanged in the crossed channel. It is known that a qualitative explanation of the polarization can be obtained by assuming that an extra term of the differential cross section is due to resonance exchange in the direct channel. Alternative explanations assume that the extra term arises from either a cut, or a second rho-meson, the rho. A previous analysis Phys. Rev. Letters v17 p834 1966 is extended to the more recent 11.2 GeV data and show that the quantitative agreement is improved by the introduction of the rho. The growing evidence for the existence of a rho is also reviewed. Consideration is given to the following three models rho resonances, rho rho resonances, and rho rho their agreement with experiment is compared. The prediction of the three models at different energies is also presented, thus providing an experimental test for distinguishing them.
- Nuclear Physics and Elementary Particle Physics
- Quantum Theory and Relativity