0000000000585640

AUTHOR

Chengyong Xu

showing 3 related works from this author

Search for Higgs bosons decaying to τ+τ− pairs in pp¯ collisions at s=1.96 TeV

2012

Abstract We present a search for the production of neutral Higgs bosons decaying into τ + τ − pairs in p p ¯ collisions at a center-of-mass energy of 1.96 TeV. The data, corresponding to an integrated luminosity of 5.4 fb−1, were collected by the D0 experiment at the Fermilab Tevatron Collider. We set upper limits at the 95% C.L. on the product of production cross section and branching ratio for a scalar resonance decaying into τ + τ − pairs, and we interpret these limits as limits on the production of Higgs bosons in the minimal supersymmetric standard model (MSSM) and as constraints in the MSSM parameter space.

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsBranching fractionHigh Energy Physics::PhenomenologyScalar (mathematics)Tevatron7. Clean energy01 natural scienceslaw.inventionStandard ModelNuclear physicslaw0103 physical sciencesHiggs bosonHigh Energy Physics::Experiment010306 general physicsColliderMinimal Supersymmetric Standard ModelBosonPhysics Letters B
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Measurement of theWZ→ℓνℓℓcross section and limits on anomalous triple gauge couplings inpp¯collisions ats=1.96TeV

2011

We present a new measurement of the WZ -> lvll (l = e, mu) cross section and limits on anomalous triple gauge couplings. Using 4.1 fb(-1) of integrated luminosity of p (p) over bar collisions at root s = 1.96 TeV, we observe 34 WZ candidate events with an estimated background of 6.0 +/- 0.4 events. We measure the WZ production cross section to be 3.89(-0.90)(+1.07) pb, in good agreement with the standard model prediction. We find no evidence for anomalous WWZ couplings and set 95% C.L. limits on the coupling parameters, -0.077 < lambda(z) < 0.093 and -0.029 < Delta kappa(z) < 0.080 in the HISZ parameterization for a Lambda = 2 TeV form factor scale. These are the best limits to date obtaine…

PhysicsNuclear and High Energy PhysicsParticle physicsLuminosity (scattering theory)010308 nuclear & particles physicsTevatronElementary particleLambda01 natural sciencesStandard ModelNuclear physicsW and Z bosons0103 physical sciencesGrand Unified TheoryHigh Energy Physics::Experiment010306 general physicsBosonPhysics Letters B
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Measurement of the tt¯ production cross section using dilepton events in pp¯ collisions

2011

We present a measurement of the a production cross section sigma((u) over bar) in p (p) over bar collisions at root s = 1.96 TeV using 5.4 fb(-1) of integrated luminosity collected with the D0 detector. We consider final states with at least two jets and two leptons (ee, e mu, mu mu), and events with one jet for the e mu final state as well. The measured cross section is sigma((u) over bar) = 7.36(-0.79)(+0.90)(stat + syst) pb. This result combined with the cross section measurement in the lepton + jets final state yields sigma((u) over bar) = 7.56(-0.56)(+0.63)(stat + syst) pb, which agrees with the standard model expectation. The relative precision of 8% of this measurement is comparable …

PhysicsNuclear and High Energy PhysicsParticle physicsLuminosity (scattering theory)010308 nuclear & particles physicsSigmaJet (particle physics)7. Clean energy01 natural sciencesStandard ModelNuclear physicsCross section (physics)0103 physical sciencesHigh Energy Physics::ExperimentProduction (computer science)010306 general physicsBar (unit)LeptonPhysics Letters B
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