München 2006 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.21: Poster
Tuesday, March 21, 2006, 15:30–17:00, P
Investigation of a0+(980) production in pp→ dπ+η with WASA at COSY⋆ — •P. Fedorets1, M. Büscher1, and V. Chernyshev2 — 1Forschungszentrum Jülich, Germany — 2ITEP, Moscow, Russia
The WASA facility is currently being installed at COSY-Jülich. We have carried out simulations in order to check the possibility to measure the reaction pp→da0+→ dπ+η with the decay channel η→γγ with WASA at a COSY beam energy of T=2.65 GeV by detection of deuterons in the forward detector and pions and photons in the central detector. The dπ+η final state will be identified by the reconstructing the η via the γγ invariant mass and the deuteron as the π+η missing mass. The a0+(980) resonance is observed as a peak in the invariant mass (π+γγ).
For an estimate of the pp→da0+→ dπ+η(→ 2γ) cross section we have used data for another a0+ decay channel, pp → da0+→ dK+K^0, recently measured with the ANKE spectrometer at COSY for the same beam energy: the estimated count rate is ≈ 13000 day−1.
The simulations further show that the main expected background reaction pp → pnπ+η with misidentification of protons as deuterons can be suppressed down to a signal/background ratio ≈ 1.
⋆Supported by EC, DFG, RFFI, PI.