Published June 1996 | Version v1
Journal article

A signal of a narrow πNN resonance in pp→ppπ-π+

  • 1. Tuebingen Univ. (Germany). Physikalisches Inst.
  • 2. Uppsala Univ. (Sweden). Dept. of Radiation Sciences
  • 3. Uppsala Univ. (Sweden). Svedberg Lab.
  • 4. Kernforschungsanlage Juelich GmbH (Germany). Inst. fuer Kernphysik
  • 5. Institute for Nuclear Studies, Warsaw (Poland)
  • 6. Joint Inst. for Nuclear Research, Dubna (Russian Federation)
  • 7. Institute of Theoretical and Experimental Physics, Moscow (Russian Federation)
  • 8. Warsaw Univ. (Poland). Inst. of Experimental Physics
  • 9. Institue for Nucl. Studies, Lodz (Poland)

Description

We report on the first exclusive measurement of the 2π production in NN collisions at Tp=750 MeV using a H2 cluster jet target and the WASA/PROMICE detector at CELSIUS. In the invariant-mass spectrum Mppπ- we observe a narrow peak at 2.063(2) GeV with a 4σ deviation relative to the MC simulations for the conventional nonresonant 2π production process. The finding is in agreement with the hypothesis of a narrow πNN resonance with I(JP)=even (0-), called d', postulated recently to describe the peculiar resonance-like behavior of the pionic double charge exchange on nuclei. (orig.)

Additional details

Publishing Information

Journal Title
Zeitschrift fuer Physik. A, Hadrons and Nuclei
Journal Volume
355
Journal Issue
1
Journal Page Range
p. 5-8.
ISSN
0939-7922
CODEN
ZPAHEX