Published August 1977 | Version v1
Report Restricted

Experimental confirmation of the 1100 MeV structure and first observation of the leptonic decay of the rho' (1250)

Creators

  • 1. Istituto Nazionale di Fisica Nucleare, Frascati (Italy). Lab. Nazionali
  • 2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany, F.R.)
  • 3. Scuola Normale Superiore, Pisa (Italy)

Description

We have extended our survey of the reaction γ + p → p + e++e- by collecting 20,000 additional e+e- pairs in the invariant mass region 900 < m < 1,500 MeV. The analysis of the measured interference pattern confirms the existence of the 1,100 narrow resonance-like structure and of the predicted rho' (1250) as 7 and 5 s.d. effects, respectively. Resonance parameters are given in the text. (orig.)

Availability note (English)

MF available from INIS under the Report Number.

Abstract (German)

Der Ueberblick ueber die Reaktion γ + p → p + e++e- wurde durch Beobachtung von 20.000 zusaetzlichen e+e--Paaren bei invarianten Massen m zwischen 900 < m < 1.500 MeV erweitert. Eine Analyse der gemessenen Interferenzstruktur bestaetigt die Existenz der schmalen, resonanzaehnlichen Struktur bei 1.100 MeV und des vorhergesagten rho' (1250) Teilchen und erlaubt ihre Interpretation als 7 bezw. 5 s.d.-Effekte. Resonanzparameter werden angegeben. (orig.)

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Additional details

Publishing Information

Imprint Pagination
8 p.
Report number
DESY--77/59

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
9356491
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
DIFFERENTIAL CROSS SECTIONS; ELECTRONS; LEPTONIC DECAY; MASS SPECTRA; PAIR PRODUCTION; PARTICLE WIDTHS; PHOTON-PROTON INTERACTIONS; PHOTOPRODUCTION; POSITRONS; POSTULATED PARTICLES; PROTONS; RHO-1250 RESONANCES
Descriptors DEC
ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BARYONS; BASIC INTERACTIONS; BOSONS; CATIONS; CHARGED PARTICLES; CROSS SECTIONS; DECAY; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; FERMIONS; HADRONS; HYDROGEN IONS; HYDROGEN IONS 1 PLUS; INTERACTIONS; IONS; LEPTONS; MATTER; MESON RESONANCES; MESONS; NUCLEONS; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PHOTON-BARYON INTERACTIONS; PHOTON-HADRON INTERACTIONS; PHOTON-NUCLEON INTERACTIONS; RESONANCE PARTICLES; SPECTRA; WEAK INTERACTIONS

Optional Information

Notes
4 figs.