Published May 2012 | Version v1
Journal article Metadata-only

Inclusive dielectron spectra in p+p collisions at 3.5 GeV kinetic beam energy

Creators

  • 1. Joint Institute of Nuclear Research, Dubna (Russian Federation)
  • 2. Jagiellonian University of Cracow, Smoluchowski Institute of Physics, Krakow (Poland)
  • 3. Univ. de Santiago de Compostela, Departamento de Fisica de Particulas, Santiago de Compostela (Spain)
  • 4. LIP-Laboratorio de Instrumentacao e Fisica Experimental de Particulas, Coimbra (Portugal)
  • 5. Technische Universitaet Muenchen, Physik Department E12, Garching (Germany)
  • 6. Universite Paris Sud, Institut de Physique Nucleaire (UMR 8608), CNRS/IN2P3, Orsay Cedex (France)
  • 7. Excellence Cluster ''Origin and Structure of the Universe'', Garching (Germany)
  • 8. Justus Liebig Universitaet Giessen, II. Physikalisches Institut, Giessen (Germany)
  • 9. Helmholtz-Zentrum Dresden-Rossendorf, Institut fuer Strahlenphysik, Dresden (Germany)
  • 10. Laboratori Nazionali del Sud, Istituto Nazionale di Fisica Nucleare, Catania (Italy)
  • 11. Goethe-Universitaet, Institut fuer Kernphysik, Frankfurt (Germany)
  • 12. Russian Academy of Science, Institute for Nuclear Research, Moscow (Russian Federation)
  • 13. GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, Darmstadt (Germany)
  • 14. Istituto Nazionale di Fisica Nucleare, Sezione di Milano, Milano (Italy)
  • 15. Academy of Sciences of Czech Republic, Nuclear Physics Institute, Rez (Czech Republic)
  • 16. University of Cyprus, Department of Physics, Nicosia (Cyprus)
  • 17. Frederick University, Nicosia (Cyprus)

Description

We present the inclusive invariant mass, transverse momentum and rapidity distributions of dielectrons (e+e- pairs) in p+p interactions at 3.5GeV beam kinetic energy. In the vector meson mass region, a distinct peak corresponding to direct ω decays is reconstructed with a 2% mass resolution. The data is compared to predictions from three model calculations. Due to the large acceptance of the HADES apparatus for e+e- invariant masses above 0.2 GeV/c2 and for transverse pair momenta pt < 1 GeV/c, acceptance corrections are, to a large extent, model independent. This allows us to extract from dielectron data for the first time at this energy the inclusive production cross-sections for light vector mesons. Inclusive production cross-sections for π0 and η mesons are also reported. The obtained results will serve as an important reference for the study of vector meson production in proton-nucleus and heavy-ion collisions. Furthermore, using this data, an improved value for the upper bound of the branching ratio for direct η decays into the electron-positron channel is obtained. (orig.)

Availability note (English)

Available from: http://dx.doi.org/10.1140/epja/i2012-12064-y

Additional details

Identifiers

DOI
10.1140/epja/i2012-12064-y;

Publishing Information

Journal Title
European Physical Journal. A
Journal Volume
48
Journal Issue
5
Journal Page Range
p. 1-11
ISSN
1434-6001

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
43071162
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
BRANCHING RATIO; DELTA-1232 BARYONS; DIFFERENTIAL CROSS SECTIONS; ETA MESONS; EXPERIMENTAL DATA; GEV RANGE 01-10; INCLUSIVE INTERACTIONS; INTEGRAL CROSS SECTIONS; OMEGA-782 MESONS; PAIR PRODUCTION; PARTICLE RAPIDITY; PIONS NEUTRAL; POSITRONS; RHO-770 MESONS; SEMILEPTONIC DECAY; TRANSVERSE MOMENTUM
Descriptors DEC
ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BARYONS; BOSONS; CROSS SECTIONS; DATA; DECAY; DELTA BARYONS; DIMENSIONLESS NUMBERS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GEV RANGE; HADRONS; INFORMATION; INTERACTIONS; LEPTONS; LINEAR MOMENTUM; MATTER; MESONS; N*BARYONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PIONS; PSEUDOSCALAR MESONS; VECTOR MESONS; WEAK PARTICLE DECAY

Optional Information

Collaborations
HADES Collaboration