0000000000061385

AUTHOR

R. Landau

showing 2 related works from this author

φ production in annihilation at rest

1991

Abstract We report on measurements of the branching ratios for φ production in p p annihilation at rest in H 2 gas. Branching ratios for φπ 0 , φη, φϱ 0 , φω and φπ + π − are determined for two data sets with different contributions of annihilations from S and P states of the p p system. The branching ratios are compared to corresponding annihilation modes where the φ is replaced by an ω meson. We conclude that φ production is in most reactions enhanced with respect to the expectation based on the OZI rule. In annihilations from the spin triplet ground state of antiprotonic hydrogen into φπ the OZI rule is violated dramatically.

PhysicsNuclear and High Energy PhysicsParticle physicsAnnihilationMesonHydrogenBranching fractionchemistry.chemical_elementNuclear physicsOZI rulechemistryMass spectrumHigh Energy Physics::ExperimentGround stateP systemPhysics Letters B
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The pseudoscalar mixing angle ΘPS from ν and ν′ production in annihiltion at rest

1992

Abstract We have determined ratios of branching ratios for p p annihilations at rest into π0η and π0η′, into ηη and ηη′, and into ωη and ωη′. All reactins are observed in two different all-neutral final states. The ratios permit a determination of the pseudoscalar mixing angle. We find ΘPS = −(17.3±1.8)°.

PhysicsPseudoscalarRest (physics)Nuclear and High Energy PhysicsParticle physicsBranching fractionMixing (physics)Physics Letters B
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