0000000000285489

AUTHOR

H.p. Dietz

showing 2 related works from this author

New states as observed by the Crystal Barrel experiment

1993

Abstract The Crystal Barrel Detector has been in operation since October 1989. Results on the analysis of the annihilation of protonium at rest into three pseudoscalars is presented. The π 0 π 0 π 0 final state confirms the existence of ƒ 2 (1520)→π 0 π 0 . In the ηη system of the π 0 ηη final state an isoscalar J PC = 0 ++ resonance with a mass of 1560 MeV/c 2 and a width of 245 MeV/c 2 is observed. The identification with ƒ 0 (1590) is doubtful since the ηη' decay is not observed with the corresponding strength. Our analysis yields an upper limit for the relative branching ratio BR(ƒ 0 (1560)→ηη') BR(ƒ 0 (1560)→ηη) .

Nuclear physicsCrystalPhysicsNuclear and High Energy PhysicsBarrelAnnihilationProtoniumBranching fractionIsoscalarResonanceState (functional analysis)Atomic physicsNuclear Physics A
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Final states with strangeness from Crystal Barrel and Asterix

1993

Abstract We discuss φ production in p p annihilation at rest from the Asterix and Crystal Barrel experiments and compare the branching ratios to similar final states without strangeness. The ωπ 0 φπ 0 production ratio is unexpectedly low. In the search for new states, the φπ0 mass spectrum shows no evidence for a resonance in the 1450 MeV/c2 mass range but the K☆K0π0 Dalitz plot shows interesting structure.

PhysicsNuclear physicsNuclear and High Energy PhysicsParticle physicsAnnihilationMass spectrumDalitz plotASTERIXStrangenessNuclear Physics A
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