A signal of a narrow pi N N resonance in p p ---> p p pi- pi+
1996
4 pages
Published in:
- Z.Phys.A 355 (1996) 5-8
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Abstract: (Springer)
We report on the first exclusive measurement of the 2π production in NN collisions atTp=750 MeV using a H2 cluster jet target and the WASA/PROMICE detector at CELSIUS. In the invariant-mass spectrum 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 narrowπNN resonance withI(JP)=even (0−), calledd′, postulated recently to describe the peculiar resonance-like behavior of the pionic double charge exchange on nuclei.- p p: exclusive reaction
- pi: pair production
- pair production: pi
- mass spectrum: (2p pi-)
- (2p pi-): mass spectrum
- mass enhancement: (2063)
- (2063): mass enhancement
- baryon resonance: narrow resonance
- narrow resonance: baryon resonance
- experimental results
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