0000000000331874

AUTHOR

I.a. Gritsaenko

showing 3 related works from this author

Search for the t and b' quarks in hadronic decays of the Z0 boson

1990

We present a search for the third generation up type quark t and a possible fourth down type quark b' in hadronic Z0 decays observed in DELPHI at the LEP collider. For any scenario with a decay through the charged current or into a charged Higgs with a mass at least 6 GeV/c2 below the t and 3 GeVc2 below the b' mass, we set a lower limit for the t quark mass at 44.0 GeV/c2 and for the b' mass at 44.5 GeV/c2. For specific scenarios the mass limits are slightly higher, e.g. for charged current decays the limits are 44.5 and 45.0 GeV/c2 respectively, where all limits are given at a 95% confidence level. © 1990.

QuarkNuclear and High Energy PhysicsTop quarkParticle physics[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]Electron–positron annihilationHadron01 natural sciences7. Clean energylaw.inventionNuclear physicslaw0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Nuclear Experiment010306 general physicsColliderCharged currentBosonPhysics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyPhysique des particules élémentairesHiggs bosonHigh Energy Physics::ExperimentParticle Physics - ExperimentPhysics Letters B
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Study of the leptonic decays of the Z0 boson

1990

Measurements are presented of the cross section ratios Rℓ = σℓ(e+e-→ℓ+ℓ -)/σhh(e+e-→hadrons) for ℓ = e, μ and τ using data taken from a scan around the Z0. The results are Re = (5.09±0.32±0.18)%, Rμ = (4.96±0.35±0.17)% and Rτ,=(4.72±0.38± 0.29)% where, for the ratio Re, the t-channel contribution has been subtracted. These results are consistent with the hypothesis of lepton universality and test this hypothesis at the energy scale s ∼ 8300 GeV2. The absolute cross sections σℓ(e+e-→ℓ +ℓ-) have also been measured. From the cross sections the leptonic partial widths Γe = (83.2±3.0±2.4) MeV, (ΓeΓμ) 1/2=(84.6±3.0±2.4) MeV and (ΓeΓτ) 1/2=(82.6±3.3±3.2) MeV have been extracted. Assuming lepton un…

PhysicsNuclear and High Energy PhysicsParticle physics[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]010308 nuclear & particles physicsElectron–positron annihilationHadronWidth ratio01 natural sciences7. Clean energyNuclear physics0103 physical sciencesPhysique des particules élémentaires[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Neutrino010306 general physicsParticle Physics - ExperimentLeptonBosonPhysics Letters B
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Measurement of the partial width of the decay of the Z0 into charm quark pairs

1990

A determination of the partial width Γc̄ of the Z0 boson into charm quark pairs is presented, based on a total sample of 36 900 Z0 hadronic decays measured with the DELPHI detector at the LEP collider. The production rate of cc events is derived from the inclusive analysis of charged pions coming from the decay of charmed meson D*+-→D0π+ and D*-→D̄0π- where the π± is constrained by kinematics to have a low pT with respect to the jet axis. The probability to procedure these π± from D*± decay in cc events is taken to be 0.31±0.05 as measured at √S = 10.55 GeV. The measured relative partial width Γ∞/Γh = 0.162± 0.030(stat.) ± 0.050(syst.) is in good agreement with the standard model value of 0…

Nuclear and High Energy PhysicsParticle physicsE+E ANNIHILATIONMesonLUND MONTE-CARLOElectron–positron annihilationHadron01 natural sciencesJET FRAGMENTATIONCharm quarkStandard Modellaw.inventionNuclear physicsPHYSICSENERGYPionLUND MONTE-CARLO; D-STAR-MESON; E+E ANNIHILATION; JET FRAGMENTATION; CROSS-SECTION; PHYSICS; ENERGYlaw0103 physical sciences010306 general physicsColliderD-STAR-MESONNuclear ExperimentBosonPhysics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyPhysique des particules élémentairesFísica nuclearHigh Energy Physics::ExperimentCROSS-SECTIONParticle Physics - Experiment
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