6533b7d2fe1ef96bd125e8cb
RESEARCH PRODUCT
Photoproduction of neutral pion pairs from the proton
R. LeukelA. SchmidtU. SiodlaczekH. StröherM. KotullaV. KuhrR.o. OwensJ. AhrensMartin SchumacherB. KruscheV. HejnyMatthias WolfV. MetagR. W. NovotnyJ. WeißF. WissmannR. BeckJ. D. KellieF. RamboJ.c. NacherV. Olmos De Leónsubject
PhysicsNuclear and High Energy PhysicsPhotonProton010308 nuclear & particles physicsNuclear TheoryHadronResonanceDalitz plotPhoton energy7. Clean energy01 natural sciencesNuclear physicsPion0103 physical sciencesInvariant massAtomic physicsNuclear Experiment010306 general physicsdescription
Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass analysis. From threshold up to 370 MeV the total cross-section does not exceed 30 nb. For higher energies it shows a smooth rise until it reaches a maximum of about 10 μb at Eγ = 740 MeV. Dalitz plots of m2(π0π0) versusm2(p,π0) for seven bins of incident photon energy have been analysed. For Eγ > 610 MeV, a strong contribution of a sequential decay is observed with the Δ(1232)-resonance as intermediate state. A comparison to model calculations shows that these sequential decays presumably originate from the D13(1520) and also the P11(1440)-resonance.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-10-01 | The European Physical Journal A |