0000000000598118

AUTHOR

K. Wittmack

showing 5 related works from this author

Momentum dependence of the decay η→π+π−π0

1998

Abstract The π 0 momentum dependence of the decay η → π + π − π 0 has been measured with the Crystal Barrel detector. The analysis is based on 3230 events. The results of this independent measurement are compared to new chiral perturbation theory calculations and previous measurements.

CrystalNuclear physicsMomentumPhysicsNuclear and High Energy PhysicsChiral perturbation theoryPhysics::Instrumentation and DetectorsDetectorBarrel (horology)Dalitz plotPhysics Letters B
researchProduct

Branching ratios for p annihilation at rest into two-body final states

2001

Abstract Measurements of two-body branching ratios for p p annihilations at rest in liquid and gaseous (12 ρ STP ) hydrogen are reported. Channels studied are p p →π 0 π 0 ,π 0 η , K 0 S K 0 L , K + K − . The branching ratio for the π 0 π 0 channel in liquid H 2 is measured to be ( 6.14±0.40)×10 −4 . The results are compared with those from other experiments. The fraction of P-state annihilation for a range of target densities from 0.002 ρ STP to liquid H 2 is determined. Values obtained include 0.11±0.02 in liquid H 2 and 0.48±0.04 in 12 ρ STP H 2 gas.

PhysicsNuclear and High Energy PhysicsAnnihilationHydrogenchemistryBranching fractionAnalytical chemistrychemistry.chemical_elementAtomic physicsBranching (polymer chemistry)Particle Physics - ExperimentNuclear Physics A
researchProduct

A high resolution search for the tensor glueball candidate ξ(2230)

2001

Abstract We report results of a high resolution search for the tensor glueball candidate ξ(2230) in a p p formation experiment. π0π0 and ηη decay channels were measured in a scan of the mass region 2220 MeV to 2240 MeV. No evidence for the existence of ξ(2230) was found. 95% confidence upper limits for the possible existence of ξ are presented.

PhysicsNuclear physicsParticle physicsNuclear and High Energy PhysicsMesonGlueballResolution (electron density)TensorPhysics Letters B
researchProduct

Annihilation at rest of antiprotons and protons into neutral particles

2003

Abstract Annihilation of antiprotons and protons at rest into neutral particles has been studied with the Crystal Barrel detector at LEAR. Annihilation frequencies are determined for final states containing π 0 , η , η ′ and ω mesons using a liquid and a room temperature, 12 bar, gaseous hydrogen target. Including annihilation frequencies for production of neutral kaons from other experiments, the identified reactions for annihilation in liquid hydrogen add up to a branching fraction of (3.56±0.28)% per annihilation compared to the frequency of (3.50±0.30)% with which we observe the all-neutral decay modes inclusively. Since the exclusive final states are normalized to the Crystal Barrel me…

Rest (physics)PhysicsNuclear and High Energy PhysicsAnnihilationMeson010308 nuclear & particles physicsBranching fraction01 natural sciences7. Clean energyNuclear physicsCrystalAntiproton0103 physical sciencesHigh Energy Physics::ExperimentAtomic physicsNuclear Experiment010306 general physicsLiquid hydrogenBar (unit)Nuclear Physics A
researchProduct

The ρ-mass, width and line shape in annihilation at rest into π+π−π0

1999

The rho mass, width and line shape in p(over)-bar-p annihilation at rest into pi(+)pi(-)pi(0)

PhysicsNuclear physicsNuclear and High Energy PhysicsNuclear magnetic resonanceAnnihilationHadron physicsPiLine (formation)Bar (unit)Physics Letters B
researchProduct