0000000000907170

AUTHOR

M. H. L. S. Wang

showing 3 related works from this author

Combination of CDF and D0 measurements of the W boson helicity in top quark decays

2012

Aaltonen, T. et al.

FERMILAB TEVATRON COLLIDERNuclear and High Energy PhysicsParticle physicsTop quark[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]TevatronW helicityValue (computer science)FOS: Physical sciencesTOP QUARK7. Clean energy01 natural sciencesHigh Energy Physics - Experimentlaw.inventionStandard ModelNuclear physicsHigh Energy Physics - Experiment (hep-ex)law0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]FermilabTEVATRON010306 general physicsColliderBosonPhysicsW BOSONp-pbar collider; FERMILAB TEVATRON COLLIDER; W bosons; W helicity010308 nuclear & particles physics[SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]W bosonsHelicityD0p-pbar colliderExperimental High Energy PhysicsComputingMethodologies_DOCUMENTANDTEXTPROCESSINGCDFPhysical Review. D, Particles, Fields, Gravitation, and Cosmology
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Search for flavor-changing-neutral-current D meson decays

2008

We study the flavor-changing-neutral-current process c to u mu+ mu- using 1.3 fb^-1 of p p bar collisions at sqrt(s) = 1.96 TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider. We see clear indications of the Ds+ and D+ to phi pi+ to mu+ mu- pi+ final states with significance greater than four standard deviations above background for the D+ state. We search for the continuum decay of D+ to pi+mu+mu- in the dimuon invariant mass spectrum away from the phi resonance. We see no evidence of signal above background and set a limit of B(D+ to pi+mu+mu-) < 3.9 x 10^-6 at the 90% C.L. This limit places the most stringent constraint on new phenomena in the c to u mu+ mu- t…

PhysicsParticle physicsMeson010308 nuclear & particles physicsFlavor-changing neutral currentHadronTevatronGeneral Physics and AstronomyFOS: Physical sciencesElementary particle01 natural sciences7. Clean energyHigh Energy Physics - ExperimentNuclear physicsParticle decayHigh Energy Physics - Experiment (hep-ex)Pair production0103 physical sciencesD meson[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::Experiment010306 general physicsPhysical Review Letters
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Model-independent measurement of the W-boson helicity in top-quark decays at D0.

2008

Made available in DSpace on 2022-04-28T20:37:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-02-14 Science and Technology Facilities Council We present the first model-independent measurement of the helicity of W bosons produced in top quark decays, based on a 1fb-1 sample of candidate tt̄ events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron pp̄ Collider. We reconstruct the angle θ* between the momenta of the down-type fermion and the top quark in the W boson rest frame for each top quark decay. A fit of the resulting cos θ* distribution finds that the fraction of longitudinal W bosons f0=0.425±0.166(stat)±0.102(syst) and the f…

PhysicsTop quarkParticle physics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyTevatronGeneral Physics and AstronomyFermionRest frame01 natural sciencesHelicityNuclear physicsParticle decay0103 physical sciencesHigh Energy Physics::Experiment010306 general physicsBosonLepton
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