Accession Number : AD0644646

Title :   ON PION-P CHARGE EXCHANGE POLARIZATION AND THE POSSIBILITY OF A SECOND RHO-MESON,

Corporate Author : ILLINOIS UNIV URBANA DEPT OF PHYSICS

Personal Author(s) : Beaupre,J. ; Logan,R. K. ; Sertorio,L.

Report Date : 1966

Pagination or Media Count : 16

Abstract : 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.

Descriptors :   (*PIONS, MESON REACTIONS), (*MESON REACTIONS, POLARIZATION), (*MESONS, NUCLEAR RESONANCE), PROTON REACTIONS, REGGE POLES, DIFFERENTIAL CROSS SECTIONS, EXCHANGE REACTIONS, NUCLEAR SPINS

Subject Categories : Nuclear Physics & Elementary Particle Physics
      Quantum Theory and Relativity

Distribution Statement : APPROVED FOR PUBLIC RELEASE