0000000000930519

AUTHOR

M. Jacewicz

showing 2 related works from this author

Precision measurement of the K S meson lifetime with the KLOE detector

2010

Using a large sample of pure, slow, short lived K0 mesons collected with KLOE detector at DaFne, we have measured the KS lifetime. From a fit to the proper time distribution we find tau = (89.562 +- 0.029_stat +- 0.043_syst) ps. This is the most precise measurement today in good agreement with the world average derived from previous measurements. We observe no dependence of the lifetime on the direction of the Ks.

PhysicsHigh Energy Physics - Experiment (hep-ex)Particle physicsPhysics and Astronomy (miscellaneous)MesonDetectorFOS: Physical sciencesProper timeHigh Energy Physics::ExperimentEngineering (miscellaneous)High Energy Physics - ExperimentLarge sampleThe European Physical Journal C
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Limit on the production of a light vector gauge boson in $\phi $ mesondecays with the KLOE detector

2012

We present a new limit on the production of a light dark-force mediator with the KLOE detector at DAPHNE. This boson, called U, has been searched for in the decay phi --> eta U, U --> e+ e-, analyzing the decay eta --> pi0 pi0 pi0 in a data sample of 1.7 fb-1. No structures are observed in the e+e- invariant mass distribution over the background. This search is combined with a previous result obtained from the decay eta --> pi+ pi- pi0, increasing the sensitivity. We set an upper limit at 90% C.L. on the ratio between the U boson coupling constant and the fine structure constant of alpha'/alpha < 1.7x10^-5 for 30<M_U<400 MeV and alpha'/alpha < 8x10^-6 for the sub-region 50<M_U<210 MeV. This…

Dark forcesNuclear and High Energy PhysicsParticle physicsElectron–positron annihilationFOS: Physical sciences01 natural sciencesSettore FIS/04 - Fisica Nucleare e Subnuclearee(+)e(-) Collisions Dark forces Gauge vector bosonHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)e(+)e(-) Collisions0103 physical sciencesgauge vector bosonInvariant massNuclear Experiment010306 general physicsBosonPhysicsCoupling constantGauge boson$e^{+}e^{-}$ collisions010308 nuclear & particles physicsSettore FIS/01 - Fisica SperimentaleForm factor (quantum field theory)Vector meson dominancePhi mesondark forcesHigh Energy Physics::ExperimentGauge vector boson
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