0000000000049305

AUTHOR

Y. P. Merekov

showing 3 related works from this author

Observation of the Doubly StrangebBaryonΩb−

2008

We report the observation of the doubly strange b baryon Omega(-)(b) in the decay channel Omega(-)(b) -> J/psi Omega(-), with J/psi -> mu(+)mu(-) and Omega(-) -> Lambda K- -> (p pi(-))K-, in p (p) over bar collisions at root s = 1.96 TeV. Using approximately 1.3 fb(-1) of data collected with the D0 detector at the Fermilab Tevatron Collider, we observe 17.8 +/- 4.9(stat) +/- 0.8(syst) Omega(-)(b) signal events at a mass of 6.165 +/- 0.010(stat) +/- 0.013(syst) GeV. The significance of the observed signal is 5.4 sigma, corresponding to a probability of 6.7 x 10(-8) of it arising from a background fluctuation.

PhysicsParticle physics010308 nuclear & particles physicsHyperonTevatronGeneral Physics and AstronomyLambda7. Clean energy01 natural sciencesOmegaBaryonNuclear physicsParticle decayPair production0103 physical sciencesHigh Energy Physics::ExperimentFermilabNuclear Experiment010306 general physicsPhysical Review Letters
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The upgraded DO detector

2006

The DØ experiment enjoyed a very successful data-collection run at the Fermilab Tevatron collider between 1992 and 1996. Since then, the detector has been upgraded to take advantage of improvements to the Tevatron and to enhance its physics capabilities. We describe the new elements of the detector, including the silicon microstrip tracker, central fiber tracker, solenoidal magnet, preshower detectors, forward muon detector, and forward proton detector. The uranium/liquid-argon calorimeters and central muon detector, remaining from Run I, are discussed briefly. We also present the associated electronics, triggering, and data acquisition systems, along with the design and implementation of s…

Nuclear and High Energy PhysicsPhysics::Instrumentation and DetectorsTevatron01 natural sciencesParticle detectorlaw.inventionNuclear physicsData acquisitionlaw0103 physical sciencesFermilab010306 general physicsColliderInstrumentationPhysics010308 nuclear & particles physicsbusiness.industryDetectorElectrical engineeringParticle acceleratorD0 experimentExperimental High Energy PhysicsComputingMethodologies_DOCUMENTANDTEXTPROCESSINGPhysics::Accelerator PhysicsHigh Energy Physics::Experimentbusiness
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Direct Observation of the StrangebBaryonΞb−

2007

We report the first direct observation of the strange b baryon Xi(b)- (Xi(b)+). We reconstruct the decay Xi(b)- -->J/psiXi-, with J/psi-->mu+mu-, and Xi--->Lambdapi--->ppi-pi- in pp collisions at square root of s =1.96 TeV. Using 1.3 fb(-1) of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat)(-0.4)(+1.9)(syst) Xi(b)- candidates at a mass of 5.774 +/- 0.011(stat) +/- 0.015(syst) GeV. The significance of the observed signal is 5.5 sigma, equivalent to a probability of 3.3 x 10(-8) of it arising from a background fluctuation. Normalizing to the decay Lambda(b)-->J/psiLambda, we measure the relative rate sigma(Xi(b-) x B(Xi)b})- -->J/psiXi-)/sigma(Lambda(b)) x B(Lambda(b)-->J/psi…

PhysicsParticle physics010308 nuclear & particles physicsDirect observationGeneral Physics and AstronomyLambda baryonLambda01 natural sciencesNuclear physicsBaryonParticle decayPair production0103 physical sciences010306 general physicsPhysical Review Letters
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