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Measurement of the reaction. pi. /sup +/n/sub arrow-up/. --> pi. /sup +/. pi. /sup -/p at 5. 98 and 11. 85 GeV/c using a transversely polarized deuteron target

Journal Article · · Phys. Rev. D; (United States)
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In an experiment carried out at the CERN Proton Synchrotron and using the CERN polarized deuteron target, the reaction ..pi../sup +/n/sub arrow-up/..--> pi../sup +/..pi../sup -/p has been measured in the region -t = 0.1--1.0 (GeV/c)/sup 2/ and m(..pi../sup +/..pi../sup -/) = 0.36--1.04 GeV at incident momenta of 5.98 and 11.85 GeV/c. We present the m and t dependence of the measured 14 linearly independent spin-density-matrix elements and of the bounds on the moduli squared of the S- and P-wave recoil transversity amplitudes. The results show the presence of ''A/sub 1/'' exchange in the unnatural nucleon-helicity-nonflip amplitudes. The natural ''A/sub 2/''-exchange amplitudes dominate at large t. In the range 0.2< or =-t< or =0.4 (GeV/c)/sup 2/ the mass dependence shows that the unnatural exchange amplitudes with transversity ''down'' are generally larger than those with transversity ''up.'' The opposite is true for the natural exchange. In this range of t and at the rho/sup 0/ mass, the P-wave unnatural amplitudes with both transversities contribute in equal amounts while the production by natural exchange proceeds entirely with transversity up. We observe rapid changes of the moduli within the rho/sup 0/ mass range and variations of the width and the position of the rho/sup 0/ peak in spin-averaged partial-wave cross sections. These structures have not been seen in previous polarization experiments and reveal spin dependence of rho/sup 0/ production. Our bounds cannot exclude an S-wave resonance in the range 700--800 MeV.
Research Organization:
Departement de Physique des Particules Elementaires, Centre d'Etudes Nucleaires de Saclay, Boite Postale No.2 , F-91191 Gif-sur-Yvette Cedex, France
OSTI ID:
5547530
Journal Information:
Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 32:1; ISSN PRVDA
Country of Publication:
United States
Language:
English

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Related Subjects

645104* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
BARYONS
BOSONS
CROSS SECTIONS
DENSITY MATRIX
DEUTERIUM TARGET
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 01-10
HADRON-HADRON INTERACTIONS
HADRONS
HELICITY
INTERACTIONS
MATRICES
MATRIX ELEMENTS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
NUCLEONS
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PION PLUS-NEUTRON INTERACTIONS
PION-NEUTRON INTERACTIONS
PION-NUCLEON INTERACTIONS
PIONS
PIONS MINUS
POLARIZED TARGETS
PROTONS
PSEUDOSCALAR MESONS
S WAVES
TARGETS