0000000001131397

AUTHOR

A. Fantini

showing 2 related works from this author

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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A new limit on the CP violating decay KS→3π0 with the KLOE experiment

2013

We have carried out a new direct search for the CP violating decay K-S -> 3 pi(0) with 1.7 fb(-1) of e(+)e(-) collisions collected by the KLOE detector at the Phi-factory DA Phi NE. We have searched for this decay in a sample of about 5.9 x 10(8) KSKL events tagging the K-S by means of the K-L interaction in the calorimeter and requiring six prompt photons. With respect to our previous search, the analysis has been improved by increasing of a factor four the tagged sample and by a more effective background rejection of fake K-S tags and spurious clusters. We find no candidates in data and simulated background samples, while we expect 0.12 standard model events. Normalizing to the number of …

PhysicsNuclear and High Energy PhysicsParticle physicsPhoton010308 nuclear & particles physics01 natural sciencesStandard ModelCalorimeterNuclear physics0103 physical sciencesCP violationDirect searchLimit (mathematics)010306 general physicsPhysics Letters B
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