0000000001270006

AUTHOR

A Walker

showing 5 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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The beam and detector for the NA48 neutral kaon CP violation experiment at CERN

2007

The beam and detector, used for the NA48 experiment, devoted to the measurement of Re (ε{lunate}′ / ε{lunate}), and for the NA48/1 experiment on rare KS and neutral hyperon decays, are described. © 2007 Elsevier B.V. All rights reserved.

Nuclear and High Energy PhysicsParticle physicsacceleratoriNA62 experiment01 natural sciencesLIQUID-KRYPTON CALORIMETERDECAYSNOfasci di particelleKaon beamsNuclear physicsDRIFT CHAMBER ELECTRONICSCERNViolazione di CP0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Kaon decaysdetector; CP violation; Kaon decays010306 general physicsInstrumentation07.05.Fb; 13.20.Eb; 29.40.Vj; 29.27.EgPhysicsCalorimeterLarge Hadron ColliderdetectorCRYSTAL010308 nuclear & particles physicsLIQUID-KRYPTON CALORIMETER; DRIFT CHAMBER ELECTRONICS; PROTON TAGGING DETECTOR; PC FARM; TRIGGER; SYSTEM; READOUT; DECAYS; PERFORMANCE; CRYSTALDetectorPC FARMHyperonNA48 experimentDetectorsMagnetic spectrometerPERFORMANCErivelatoriREADOUTkaon decayCalorimeterTriggerCP violationfasci di particelle; acceleratori; CERN; Violazione di CP; rivelatori; kaon decayCP violationHigh Energy Physics::ExperimentParticle Physics - ExperimentPROTON TAGGING DETECTORSYSTEMBeam (structure)
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Kaon physics at the CERN-SPS

2015

The NA48/2 and NA62 collaborations report on recent results, current status, and prospects of kaon physics at the CERN-SPS. The NA62 collaborations aims to measure the decay [Formula: see text] with an uncertainty of 10% or better. The NA62 detector and preliminary results from a pilot run in 2014 are presented. In addition, recent results of the NA48/2 collaboration are reported. A search for Dark Photons has been performed in [Formula: see text] decays via the kaon decays [Formula: see text] and [Formula: see text]. No dark photon signal was observed and new upper limits on the mixing parameter [Formula: see text] and the dark photon mass were computed. We also report the first observati…

Nuclear physicsPhysicsParticle physicsLarge Hadron ColliderPhotonDetectorMeasure (physics)High Energy Physics::ExperimentMixing (physics)Dark photonSettore FIS/04 - Fisica Nucleare e Subnucleare
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