Prism Plot Analysis of the Reaction pi(-)p yields p pi(+)pi(-)pi(-) at 15 GeV/c.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF PHYSICS
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The four body final state pi-p yields p pipi-pi- has been analyzed at incident beam momentum of 15 GeVc. The data are taken from 460,000 photographs of the SLAC 82-inch Hydrogen Bubble Chamber. All events were measured by the M.I.T. PEPR Precision Encoding and Pattern Recognition system, and processed through the CERBERUS-GEOMAT-SQUAW chain. The four body final state pi-p yields p pipi-pi- is analyzed by means of the Prism Plot technique. Cross sections, invariant mass spectra and angular distributions for all channels contributing to the final state are presented. The dominant channels are found to be the diffraction dissociation of the beam and nucleon. A new, broad, three pion enhancement, first reported by other groups, is clearly seen in the data with a cross section of 132 or - 56 microbars. Its mass distribution centers about 1.7 sq GeVc, and it decays through the rho 0 pi- mode. Author
- Nuclear Physics and Elementary Particle Physics