Search results for "NATURAL SCIENCES"

showing 10 items of 34155 documents

Search for the Decay of the Higgs Boson to Charm Quarks with the ATLAS Experiment

2018

A direct search for the standard model Higgs boson decaying to a pair of charm quarks is presented. Associated production of the Higgs and Z bosons, in the decay mode ZH→ℓ+ℓ−c¯c is studied. A data set with an integrated luminosity of 36.1  fb−1 of pp collisions at √s=13TeV recorded by the ATLAS experiment at the LHC is used. The H→c¯c signature is identified using charm-tagging algorithms. The observed (expected) upper limit on σ(pp→ZH)×B(H→c¯c) is 2.7 (3.9+2.1−1.1) pb at the 95% confidence level for a Higgs boson mass of 125 GeV, while the standard model value is 26 fb.

Большой адронный коллайдер13000 GeV-cmsCiencias Físicascharm: pair productionQuarksGeneral Physics and Astronomy01 natural sciences7. Clean energyHigh Energy Physics - ExperimentSubatomär fysik//purl.org/becyt/ford/1 [https]High Energy Physics - Experiment (hep-ex)Subatomic Physicsscattering [p p]PROGRAM[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]HADRON COLLIDERSCollisionsassociated production [Z0]STRAHLUNGпротон-протонные столкновенияGeneralLiterature_REFERENCE(e.g.dictionariesencyclopediasglossaries)QCBosonPhysicscharm: particle identificationproton–proton collisionsLarge Hadron ColliderHiggs bosonsSettore FIS/01 - Fisica SperimentaleATLAS experimentS126SCCPhysical SystemsATLAS:Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP]channel cross section: branching ratio: upper limitQuantum field theorymedicine.anatomical_structureCERN LHC CollHiggs particle: massHADRON COLLIDERS; STANDARD MODEL; STRAHLUNG; PARTICLE; PROGRAM; LHCHiggs bosonХиггса бозонProduction (computer science)LHCcolliding beams [p p]PARTICLEParticle Physics - ExperimentCIENCIAS NATURALES Y EXACTASsignaturejetsParticle physicsp p: scatteringpair production [charm]Higgs boson530 PhysicsCiências Naturais::Ciências Físicas:Ciências Físicas [Ciências Naturais]STANDARD MODELCharm quarkFOS: Physical sciencesddc:500.2Física de Partículas y CamposSpontaneous symmetry breakingdecay modesStandard ModelCharm quarkPhysics and Astronomy (all)particle identification [charm]Atlas (anatomy)0103 physical sciencesmedicineddc:530High Energy Physics010306 general physicsCiencias Exactasbranching ratio: upper limit [channel cross section]Science & Technologyhep-ex010308 nuclear & particles physicsHigh Energy Physics::Phenomenology:Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP]Físicamass [Higgs particle]//purl.org/becyt/ford/1.3 [https]leptonic decay [Z0]Research AreasZ0: associated productionhadronic decay [Higgs particle]Higgs particle: hadronic decayExperimental High Energy PhysicsZ0: leptonic decayHigh Energy Physics::ExperimentATLAS детекторHadron-hadron collisionsp p: colliding beamsexperimental results
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Beam-induced and cosmic-ray backgrounds observed in the ATLAS detector during the LHC 2012 proton-proton running period

2016

This paper discusses various observations on beam-induced and cosmic-ray backgrounds in the ATLAS detector during the LHC 2012 proton-proton run. Building on published results based on 2011 data, the correlations between background and residual pressure of the beam vacuum are revisited. Ghost charge evolution over 2012 and its role for backgrounds are evaluated. New methods to monitor ghost charge with beam-gas rates are presented and observations of LHC abort gap population by ghost charge are discussed in detail. Fake jets from colliding bunches and from ghost charge are analysed with improved methods, showing that ghost charge in individual radio-frequency buckets of the LHC can be resol…

Большой адронный коллайдерbackground [beam]Physics::Instrumentation and DetectorsMonte Carlo methodPerformance of high energy physics detectorJet (particle physics)01 natural sciencesHigh Energy Physics - ExperimentSubatomär fysikHigh Energy Physics - Experiment (hep-ex)pressureSubatomic Physicsscattering [p p][PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Instrumentationпротон-протонные столкновенияQCMathematical PhysicsPhysicseducation.field_of_studyPerformance of high energy physics detectorsLarge Hadron ColliderSettore FIS/01 - Fisica SperimentaleBeam-intensity monitors; Beam-line instrumentation (beam position and profile monitors; Bunch length monitors); Data analysis; Performance of high energy physics detectors; Instrumentation; Mathematical PhysicsData analysiMonte Carlo [numerical calculations]ATLASbuildingsBunchesCERN LHC CollBeam-intensity monitorBeam-line instrumentation (beam position and profile monitorComputingMethodologies_DOCUMENTANDTEXTPROCESSINGcolliding beams [p p]Particle Physics - ExperimentParticle physicsCiências Naturais::Ciências Físicas530 PhysicsAstrophysics::High Energy Astrophysical PhenomenaPopulation:Ciências Físicas [Ciências Naturais]Beam-line instrumentation (beam position and profile monitorsData analysisFOS: Physical sciencesgapCosmic ray530Bunch length monitors)Nuclear physicsATLAS LHC High Energy Physics510 Mathematics0103 physical sciencesBeam-line instrumentation (beam position and profile monitors;; beam-intensity monitors; bunch length monitors); Data analysis;; Performance of High Energy Physics Detectors; LEPHigh Energy Physicsddc:610010306 general physicseducationMuonScience & Technologycosmic radiation [muon]010308 nuclear & particles physicsFísicaLEPBeam-intensity monitorsghostcorrelationExperimental High Energy PhysicsBeam-line instrumentation (beam position and profile monitors; beam-intensity monitors; bunch length monitors); Data analysis; Performance of High Energy Physics DetectorsBeam-line instrumentation (beam position and profile monitors; beam-intensity monitors; bunch length monitors)Physics::Accelerator PhysicsPerformance of High Energy Physics DetectorsATLAS детекторBeam (structure)experimental resultsbeam-line instrumentation
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Высокочастотные безэлектродные источники света

1992

Высокочастотные безэлектродные лампы:NATURAL SCIENCES::Physics::Other physics::Optics [Research Subject Categories]Elektriskās spuldzesИсточники светаOptikaSpektroskopijaОптические приборыОптикаElectric lampsСпектроскопияСпектральный анализSpectroscopy
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Курляндская губерния

1862

ГеографияКурляндская губерния - физическая географияĢeogrāfijaKurzemes guberņa - ģeogrāfijaКурляндская губерния - экономическая географияКурляндская губерния - статистика:SOCIAL SCIENCES::Business and economics::Human geography economic geography [Research Subject Categories]Курляндская губерния - географияKurzemes guberņa - ekonomiskais stāvoklisĢeogrāfija - Kurzemes guberņaKurzemes guberņa - ekonomiskā ģeogrāfija:NATURAL SCIENCES::Earth sciences::Exogenous earth sciences::Physical geography [Research Subject Categories]
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Фотофизические процессы в неорганических материалах при записи голограмм

1979

ГолографияАморфные полупроводникиCietvielu fizikaHolographyAmorfie pusvadītājiГолограммыЭлектрооптические материалыФизика твердого тела:NATURAL SCIENCES::Physics::Atomic and molecular physics [Research Subject Categories]ПолупроводникиСегнетоэлектрикиФотохромные материалыHologrāfijaSegnetoelektriķi
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Морфогенез долин области последнего материкового оледенения и современные речные процессы : (на примере Средней Прибалтики)

1985

Долинно-образные формыErozijaĢeomorfoloģijaIeleju-upju tīklsPamatiežu reljefsAluviālie nogulumiгеоморфологияАллювиальные отложннияЭрозияIelejas formasРельеф коренных породPaleoģeogrāfijaДолинно-речная сеть:NATURAL SCIENCES::Earth sciences::Exogenous earth sciences::History of geology and palaeontology [Research Subject Categories]Ieleju veidošanāsпалеогеографиядолинобразование
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Zooloģijas muzeja raksti [Zooloģijas muzeja biļetens], Nr. 1

1967

ЗоологияAnimal morphologyЭкология животныхZooģeogrāfija (Latvija)PutniDzīvnieku sistemātikaLatvijas faunaAnimal ecologyZooloģijaЖивотныеZīdītājiZoogeographyKukaiņiZoologyDzīvnieku ekoloģijaСистематика животных:NATURAL SCIENCES::Biology::Organism biology::Animal physiology [Research Subject Categories]Dzīvnieku morfoloģijaМорфология животныхAnimal systematics
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Zooloģijas aktuālās problēmas

1989

Rakstu krājumā ievietoti materiāli par Latvijas faunu, dzīvnieku sistemātiku, ekoloģiju, morfoloģiju un etoloģiju, kā arī pētīšanas metodēm zooloģijā.

ЗоологияDzīvnieku sistemātikaDzīvnieku uzvedība:NATURAL SCIENCES::Biology::Organism biology [Research Subject Categories]ZooloģijaZoologyDzīvnieku ekoloģijaDzīvnieku morfoloģija
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Zooloģijas muzeja raksti, Nr. 4 Invertebrata

1970

ЗоологияEntomoloģijaInsectaLatvijas faunaZooloģijaOzols Edgars - entomologsНасекомыеKukaiņiZoology:NATURAL SCIENCES::Biology::Organism biology::Animal physiology [Research Subject Categories]
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Zooloģijas muzeja raksti, Nr. 8 Invertebrata

1972

ЗоологияEntomoloģijaInsectaZooloģijaНасекомыеKukaiņiZoology:NATURAL SCIENCES::Biology::Organism biology::Animal physiology [Research Subject Categories]
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