The pp -> pp pi pi pi reaction channels in the threshold region

Abstract

The cross section for prompt neutral and charged three pion production in pp interactions was measured at excess energies in the range 160 - 217 MeV. That comprises the first measurement of the pp->pp pi0pi0pi0 reaction and the comparison with the pp->pp pi+pi-pi0 reaction, in a very direct way. The experiment was performed above the eta meson production threshold and the cross section normalization was obtained from a concurrent measurement of the reaction pp->pp eta with the eta decaying into 3 pions. Since the same final states are selected, the measurement has a low systematical error. The measured cross section ratio sigma(pp->pp pi+pi-pi0)/sigma(pp->pp pi0\pi0\pi0) is compared to predictions of dominance of different isobars in the intermediate state.

12 pages, 4 figures New discussion on the pp->pp3pi reaction mechanism

References in corpus (10)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• The ratios of the light quark masses
• Meson production in nucleon--nucleon collisions close to the threshold
• Baryon Resonance Extraction from piN Data using a Unitary Multichannel Model
• Theoretical study of the N N --> N N pi pi reaction
• Comparison of eta and eta' production in the pp -> pp eta(eta') reactions near threshold
• Experimental study of pp eta dynamics in the pp --> ppeta reaction
• Measurement of the Eta Production in Proton Proton Collisions with the COSY Time of Flight Spectrometer
• Phenomenology of pp->pp eta reaction close to threshold

Cited by in corpus (9)

• Parametrization of gamma-ray production cross-sections for pp interactions in a broad proton energy range from the kinematic threshold to PeV energies
• The WASA Detector Facility at CELSIUS
• Measurement of the eta->3pi0 Dalitz Plot Distribution with the WASA Detector at COSY
• Measurement of the Slope Parameter for the eta->3pi0 Decay in the pp->pp eta Reaction
• Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy
• Observation of an ABC effect in proton-proton collisions
• Reaction pp -> pp πππas a background for hadronic decays of the eta-prime meson
• Leading Modes of the 3pi0 production in proton-proton collisions at incident proton momentum 3.35GeV/c
• Production of eta and 3pi mesons in the pd->3HeX reaction at 1360 and 1450 MeV