Search results for " Rare Decay"

showing 3 items of 13 documents

Searches for lepton number violating $K^+$ decays

2019

The NA62 experiment at CERN reports a search for the lepton number violating decays K+ -> pi(-)e(+)e(+) and K+ -> pi(-)mu(+)mu(+) using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 x 10(-10) and 4.2 x 10(-11) are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

branching ratio: upper limitK+: rare decayNA62 experiment01 natural sciencesNA62Settore FIS/04 - Fisica Nucleare e SubnucleareHigh Energy Physics - Experimentelectron: pair productionHigh Energy Physics - Experiment (hep-ex)EconomicaK+: branching ratio[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]K meson decayPhysicsLarge Hadron ColliderElectroweak interactionlcsh:QC1-999muon: pair productionlepton number violationK+: semileptonic decayK+: secondary beamParticle Physics - ExperimentNuclear and High Energy PhysicsParticle physicsCERN LabS010.46FOS: Physical scienceskaonsS010:Desig=46K+ --> pi- 2muon+Partícules (Física nuclear)PE2_2Violació CP (Física nuclear)0103 physical sciencesKaon decayslepton number violation K meson K meson decay010306 general physicslepton number: violationKaon decays Lepton Number Violationhep-ex010308 nuclear & particles physicsS010:Desig=19CERN SPSK mesonLepton numberK+ --> pi- electron positronKaon Physics; Lepton Flavour Violation; NA62S010.19lcsh:Physicsexperimental results
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Observation of the rare B(s)(0) + decay from the combined analysis of CMS and LHCb data.

2015

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported licence.-- et al.

fundamental particleCompact Muon Solenoidstandard model flavor changing neutral currentsradioisotope decayB physicGaussian methodMU(+)MU(-)Temel Bilimler (SCI)rare decay [B/s0]Elementary particleATLAS DETECTOR12.15.MmÇOK DİSİPLİNLİ BİLİMLERRARE B-MESON DECAYS7000 GeV-cms8000 GeV-cmsSettore ING-INF/01 - Elettronica01 natural sciences7. Clean energyddc:0702 CHARGED LEPTONSscattering [p p]High energy physics ; Experimental particle physics ; LHC ; CMS ; Standard ModelQC[Anahtar Kelime Yok]Large Hadron ColliderMedicine (all); Multidisciplinarystandard3. Good healthHigh Energy Physics - PhenomenologyCERN LHC CollFIS/01 - FISICA SPERIMENTALEpriority journalHiggs bosonScience & Technology - Other TopicsPARTICLE PHYSICSmass spectrum [dimuon]Protonviolationcolliding beams [p p]physicschemical analyzerMesonModels beyond the standard modelprobabilitymesonelectromagnetic radiationB/s0 --> muon+ muon-Nuclear physicsbranching ratio: measured [B0]SEARCHLeptonic semileptonic and radiative decays of bottom mesonRARE B-MESON DECAYS; MINIMAL FLAVOR VIOLATION; LHC; CMS DETECTOR; LHCb DETECTOR; SEARCH; MU(+)MU(-); B-S(0); B-0;B-MESON DECAYS; MINIMAL FLAVOR VIOLATION; 2 CHARGED LEPTONS; ATLAS; DETECTOR; SEARCH; MU(+)MU(-); B-S(0); B-0; COLLIDER; PARTICLE010306 general physicsScience & TechnologyMuonMULTIDISCIPLINARY SCIENCES010308 nuclear & particles physicsBranching fractionMeson Bnull hypothesisDoğa Bilimleri GenelElementary particlesLARGE HADRON COLLIDERHEPp(p)over-bar collisionsNATURAL SCIENCES GENERALrare decay [B0]13.20.HeMINIMAL FLAVOR VIOLATIONchemical analysisprecisionB0 --> muon+ muon-Física de partículesExperimental particle physicsleptonic decay [B0]Physics::Instrumentation and DetectorsPhysics beyond the Standard ModelB-meson decays; p(p)over-bar collisions; branching fraction; root-s=1.96 tev; search; mu(+)mu(-); b-0; b-s(0); violation; modelsLarge Hadron Collider (LHC)High Energy Physics - ExperimentSettore FIS/04 - Fisica Nucleare e SubnucleareNeutral currentCOLLIDER[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]uncertainty12.60.-iFlavour Physicmass spectrometryPhysicsExperimental particleMultidisciplinaryCMSMedicine (all)Temel BilimlerSettore FIS/01 - Fisica SperimentaleB-meson decaysATLASLarge Hadron Collider beautybranching ratio: measured [B/s0]root-s=1.96 tevNatural Sciences (SCI)LHCNatural SciencesPARTICLEdata processingParticle Physics - Experimentchemical reactionParticle physicsbranching fractionNOPARTICLE PHYSICS; LARGE HADRON COLLIDER; CMS; LHCBmodelsLHCBExperimental particle; physics; data processing; electromagnetic field; electromagnetic radiation; fundamental particle; Gaussian method; physics; precision; chemical analysis; chemical analyzer; chemical reaction; elementary particle; Large Hadron Collider beauty; mass spectrometry; meson; null hypothesis; prediction; priority journal; probability; radioisotope decay; standard; uncertainty;B-MESON DECAYSelectromagnetic fieldTheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITYRare Decay0103 physical sciencesElectromagnetic fieldB-0elementary particleSDG 7 - Affordable and Clean EnergyDETECTORCompact Muon SolenoidMultidisipliner/dk/atira/pure/sustainabledevelopmentgoals/affordable_and_clean_energyLHCb DETECTORCMS LHC Meson B Rare DecayMinimal flavor violationpredictionLeptonsLHC-Bleptonic decay [B/s0]LHCbRare decayMedicine (all) MultidisciplinaryRARE B-MESON DECAYS; MINIMAL FLAVOR VIOLATION; LHC; CMS DETECTOR; LHCb DETECTOR; SEARCH; MU(+)MU(-); B-S(0); B-0B-S(0)[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]High Energy Physics::ExperimentExperimentsexperimental resultsCMS DETECTOR
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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
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