0000000001024603

AUTHOR

M. Jaffre

showing 3 related works from this author

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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Measurement of the muon charge asymmetry from W boson decays

2008

We present a measurement of the muon charge asymmetry from W boson decays using 0.3 fb^{-1} of data collected at \sqrt{s}=1.96 GeV between 2002 and 2004 with the D0 detector at the Fermilab Tevatron ppbar Collider. We compare our findings with expectations from next-to-leading-order calculations performed using the CTEQ6.1M and MRST04 NLO parton distribution functions. Our findings can be used to constrain future parton distribution function fits.

PhysicsNuclear and High Energy PhysicsParticle physicsMuon010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyTevatronFOS: Physical sciencesCharge (physics)Parton01 natural sciencesHigh Energy Physics - Experimentlaw.inventionHigh Energy Physics - Experiment (hep-ex)Distribution functionlaw0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::ExperimentFermilab010306 general physicsColliderNuclear ExperimentBoson
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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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