Published January 1981 | Version v1
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Search for narrow baryon resonances (of masses through 3.4 and 5 GeV) through a π-p large angle elastic scattering formation experiment

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Description

This work describes a search for narrow baryon resonances (of masses between 3.4 and 5 GeV) through a π-p large angle elastic scattering formation experiment. An optimization of the sensitivity of the experiment to detect resonances is obtained by the measurement of the central part of the angular distribution (/cos theta*/<=0.4). An exceptional mass resolution has been achieved by using a focusing spectrometer which measures the incident particles momenta with a precision Δplab/plab=+-2x10-4. The apparatus and data analysis are described in details. No narrow resonance has been found, the sensitivity of the experiment being characterized by a width GAMMA approximately equal to 1 MeV and an elasticity x approximately equal to 0.01. Finally, the differential cross section measurement is compared to some parton models

Availability note (English)

MF available from INIS under the Report Number.

Abstract (French)

Ce travail decrit la recherche de resonances baryoniques etroites de masses comprises entre 3.4 et 5 GeV, en formation dans la diffusion elastique π-p a grand angle. La mesure de la partie centrale de la diffusion angulaire /cos theta*/<=0.4 permet d'optimiser la sensibilite de l'experience a des resonances. Une resolution en masse exceptionnelle est obtenue grace a un spectrometre focalisant assurant une mesure de l'impulsion des particules incicentes avec une precision relative Δplab/plab=+-2x10-4. L'appareillage et l'analyse des donnees sont decrits en detail. Aucune resonance etroite n'a ete mise en evidence, la sensibilite de l'experience etant caracterisee par des largeurs GAMMA approximativement egales a 1 MeV et des elasticites x approximativement egales a 0.01. Enfin, la mesure de la section efficace differentielle est comparee a certains modeles de partons

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Additional details

Additional titles

Original title (French)
Recherche de resonances baryoniques etroites de masses comprises entre 3,4 et 5 GeV en formation dans la diffusion elastique de pions negatifs par des protons

Publishing Information

Imprint Pagination
217 p.
Report number
LPC-T--81-01

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
13701677
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data, Thesis
Descriptors DEI
ANGULAR DISTRIBUTION; BARYON RESONANCES; CERN PS SYNCHROTRON; CHERENKOV COUNTERS; COMPILED DATA; DIFFERENTIAL CROSS SECTIONS; ELASTIC SCATTERING; EXPERIMENTAL DATA; GEV RANGE 10-100; PARTON MODEL; PION MINUS-PROTON INTERACTIONS; PROPORTIONAL COUNTERS
Descriptors DEC
ACCELERATORS; BARYONS; COMPOSITE MODELS; CROSS SECTIONS; CYCLIC ACCELERATORS; DATA; DISTRIBUTION; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GEV RANGE; HADRON-HADRON INTERACTIONS; HADRONS; INFORMATION; INTERACTIONS; MATHEMATICAL MODELS; MEASURING INSTRUMENTS; MESON-BARYON INTERACTIONS; MESON-NUCLEON INTERACTIONS; NUMERICAL DATA; PARTICLE INTERACTIONS; PARTICLE MODELS; PION-NUCLEON INTERACTIONS; PION-PROTON INTERACTIONS; RADIATION DETECTORS; RESONANCE PARTICLES; SCATTERING; SYNCHROTRONS