Search results for "CP violation."

showing 4 items of 434 documents

Can future observation of the living partner post-tag the past decayed state in entangled neutral K mesons?

2019

Entangled neutral K mesons allow for the study of their correlated dynamics at interference and decoherence times not accessible in any other system. We find novel quantum phenomena associated to a correlation in time between the two partners: The past state of the first decayed kaon, when it was entangled before its decay, is post-tagged by the result and the time of the future observation of the second decay channel. This surprising "from future to past"effect is fully observable and leads to the unique experimental tag of the KS state, an unsolved problem since the discovery of CP violation.

futureQuantum PhysicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)CP violationneutral kaons entanglement CP violation futureFOS: Physical sciencesHigh Energy Physics::Experimentneutral kaonsQuantum Physics (quant-ph)entanglement
researchProduct

Observation of the rare decay K-S -> pi(0)e(+)e(-)

2003

A search for the decay Ks->pi0e+e- has been made by the NA48/1 experiment at the CERN SPS accelerator. Using data collected during 89 days in 2002 with a high-intensity Ks beam, 7 events were found with a background of 0.15 events. The branching fraction BR(Ks->pi0e+e-, m(ee) > 0.165 GeV/c^2) = (3.0^{+1.5}_{-1.2}(stat) +/-0.2 (syst)) x 10^{-9} has been measured. Using a vector matrix element and a form factor equal to one, the measurement gives BR(Ks->pi0e+e-) = (5.8^{+2.9}_{-2.4}) x 10^{-9}.

mesoni K; decadimenti rariPhysicsNuclear and High Energy Physics010308 nuclear & particles physicsBranching fractionK-LForm factor (quantum field theory)Analytical chemistryKAON DECAYS01 natural sciences3. Good healthHigh Energy Physics - Experimentmesoni Kdecadimenti rariCP VIOLATION; KAON DECAYS; K-L; SEARCHSEARCH0103 physical sciencesMatrix elementCP VIOLATIONAtomic physics010306 general physics
researchProduct

First observation and study of the K± → π±π0e+e− decay

2018

The NA48/2 experiment at CERN reports the first observation of the K-+/- -> pi(+/-)pi(0)e(+)e(-) decay from an exposure of 1.7 x 10(11) charged kaon decays recorded in 2003-2004. A sample of 4919 candidates with 4.9% background contamination allows the determination of the branching ratio in the full kinematic region, BR(K-+/- -> pi(+/-)pi(0)e(+)e(-)) = (4.24 +/- 0.14) x 10(-6). The study of the kinematic space shows evidence for a structure dependent contribution in agreement with predictions based on chiral perturbation theory. Several P- and CP-violating asymmetries are also evaluated.

rare decayNuclear and High Energy PhysicsChiral perturbation theoryCP violation; Monte-Carlo; searchAstronomy & AstrophysicsSpace (mathematics)quark mixing01 natural sciencesPartícules (Física nuclear)Charged Kaon decaysPhysics Particles & FieldsCharged Kaon decays quark mixing radiative kaon decay chiral perturbation theoryEconomica0202 Atomic Molecular Nuclear Particle And Plasma PhysicsViolació CP (Física nuclear)MONTE-CARLOSEARCH0103 physical sciencesKaon decaysradiative kaon decay010306 general physicsPhysicsScience & Technology010308 nuclear & particles physicsBranching fractionPhysicsKaon decays Chiral Perturbation TheoryAmbientaleK mesonNuclear & Particles PhysicsChiral Perturbation Theorylcsh:QC1-999fixed target experimentPhysics NuclearPhysical SciencesK meson rare decay fixed target experimentCP violationHigh Energy Physics::ExperimentCP VIOLATIONAtomic physicslcsh:PhysicsPhysics Letters B
researchProduct

Extending Physics Potential of Large Liquid Scintillator Neutrino Detectors

2016

tutkimuslaitteetneutriinotneutrinosliquid scintillatorsnestetuikeilmaisimetsteriilit neutriinotneutriino-oskillaatioCP violationsterile neutrinosilmaisimetCP-rikkoneutrino oscillationDetectors and Experimental TechniquesgeoneutriinotgeoneutrinosParticle Physics - Experimentneutrino detectors
researchProduct