0000000000097109

AUTHOR

I Pellmann

showing 3 related works from this author

Measurement of the radiative K-e3 branching ratio

2005

We present a measurement of the relative branching ratio of the decay KL -> pi e nu gamma (Ke3gamma) with respect to KL-> pi e nu (gamma) (Ke3+Ke3gamma) decay. The result is based on observation of 19 000 Ke3gamma and 5.6 x 10^6 Ke3 decays. The value of the branching ratio is Br(Ke3gamma, Egamma^*>30 MeV,theta(e,gamma)^*>20^o)/Br(Ke3)= (0.964+-0.008+0.011-0.009)%. This result agrees with theoretical predictions but is at variance with a recently published result.

Nuclear and High Energy PhysicsChiral perturbation theoryPhotonHadronFOS: Physical scienceskaon decay; NEUTRAL KAON; branching ratio7. Clean energy01 natural sciencesNEUTRAL KAONHigh Energy Physics - ExperimentNuclear physicsmesoni KHigh Energy Physics - Experiment (hep-ex)0103 physical sciencesRadiative transfer[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]radiative kaon decays010306 general physicsmesoni K; decadimenti radiativiPhysics010308 nuclear & particles physicsBranching fractionK13 DECAYSBremsstrahlungkaon decayAmplitudedecadimenti radiativibranching ratioAtomic physicsParticle Physics - Experiment
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A measurement of the K-S lifetime

2002

A measurement of the K_S lifetime is presented using data recorded by the NA48 experiment at the CERN-SPS during 1998 and 1999. The K_S lifetime is derived from the ratio of decay time distributions in simultaneous, collinear K_S and K_L beams, giving a result which is approximately independent of the detector acceptance and with reduced systematic errors. The result obtained is tau_S=(0.89598 +- 0.00048 +- 0.00051)x10^(-10) s, where the first error is statistical and the second systematic.

Systematic errorNuclear and High Energy Physics[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]NA48 EXPERIMENT; CERN; ELECTRONICS; SYSTEM; DECAYSFOS: Physical sciencesmesoni K; vita media; K meson lifetimek mesons01 natural sciencesDECAYSHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)ELECTRONICS0103 physical sciencesCERN[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]K short010306 general physicsPhysicslifetimeK-meson lifetimeLarge Hadron ColliderNA48 EXPERIMENT010308 nuclear & particles physicsDetectorHigh Energy Physics::PhenomenologyNA48 experimentK-meson lifetime; K shortDecay timePhysics::Accelerator PhysicsHigh Energy Physics::Experimentk mesons; lifetimeParticle Physics - ExperimentSYSTEM
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Search for the decay K-s -> pi(0)e(+)e(-)

2001

Abstract A search for the decay K S →π 0 e + e − has been made using the NA48 detector at the CERN SPS. Using data collected in 1999 during a 40-hour run with a high-intensity KS beam, an upper limit for the branching fraction B (K S →π 0 e + e − ) −7 at 90% confidence level has been obtained.

PhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron ColliderBranching fractiondecadimentiDetectorpionKaonsCP VIOLATION; KAONKAONK mesonNuclear physicsmesoni Kmesoni K; decadimentiCP violationLimit (mathematics)CP VIOLATIONK meson; pionradiative decaysBeam (structure)Kaons; radiative decays; chiral perturbation theorychiral perturbation theory
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