0000000000297316

AUTHOR

Joakim Olsson

showing 3 related works from this author

Search for a Structure in the Bs0π± Invariant Mass Spectrum with the ATLAS Experiment

2018

A search for the narrow structure, X(5568), reported by the D0 Collaboration in the decay sequence X→B_{s}^{0}π^{±}, B_{s}^{0}→J/ψϕ, is presented. The analysis is based on a data sample recorded with the ATLAS detector at the LHC corresponding to 4.9  fb^{-1} of pp collisions at 7 TeV and 19.5  fb^{-1} at 8 TeV. No significant signal was found. Upper limits on the number of signal events, with properties corresponding to those reported by D0, and on the X production rate relative to B_{s}^{0} mesons, ρ_{X}, were determined at 95% confidence level. The results are N(X)<382 and ρ_{X}<0.015 for B_{s}^{0} mesons with transverse momenta above 10 GeV, and N(X)<356 and ρ_{X}<0.016 for transverse m…

PhysicsParticle physicsMeson010308 nuclear & particles physicsATLAS experimentSpectrum (functional analysis)HadronGeneral Physics and Astronomy01 natural sciencesmedicine.anatomical_structureAtlas (anatomy)0103 physical sciencesMass spectrummedicineInvariant mass010306 general physicsBosonPhysical Review Letters
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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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Measurements of Higgs boson properties in the diphoton decay channel with 36  fb−1 of pp collision data at s=13  TeV with the ATLAS detector

2018

Properties of the Higgs boson are measured in the two-photon final state using 36.1 fb-1 of proton? proton collision data recorded at ffiffi √s = 13 TeV by the ATLAS experiment at the Large Hadron Collider. Cross-section measurements for the production of a Higgs boson through gluon-gluon fusion, vectorboson fusion, and in association with a vector boson or a top-quark pair are reported. The signal strength, defined as the ratio of the observed to the expected signal yield, is measured for each of these production processes as well as inclusively. The global signal strength measurement of 0.99 ± 0.14 improves on the precision of the ATLAS measurement at √s = 7 and 8 TeV by a factor of two. …

Quantum chromodynamicsPhysicsParticle physicsLarge Hadron ColliderPhoton010308 nuclear & particles physicsPhysics beyond the Standard ModelHigh Energy Physics::PhenomenologyATLAS experiment7. Clean energy01 natural sciencesVector boson0103 physical sciencesHiggs bosonHigh Energy Physics::Experiment010306 general physicsLeptonPhysical Review D
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