0000000000110367

AUTHOR

B. Franck

showing 2 related works from this author

FIRST MEASUREMENT OF THE STRANGE QUARK ASYMMETRY AT THE Z(0) PEAK

1995

A measurement of the strange quark forward-backward asymmetry at the Z0 peak was performed using 718,000 multihadronic Z0 decays collected by the DELPHI detector at LEP in 1992. The s-quark was tagged by the presence of high momentum charged kaons identified by the Ring Imaging Cherenkov detector and by Λ0;s decaying into pπ-. The s-quark purity obtained was estimated for the two hadrons to be 43%. The average s-quark asymmetry was found to be 0.131±0.035 (stat.) ±0.013 (syst.). The forward-backward asymmetry was measured for unresolved d-and s-quarks, tagged by the detection of a high energy neutron or neutral kaon in the Hadron Calorimeter. The combined d-and s-quark purity was 69% and th…

Strange quarkParticle physicsPhysics and Astronomy (miscellaneous)s-quarkLUND MONTE-CARLOHigh Energy Physics::LatticeElectron–positron annihilationmedia_common.quotation_subjectHadronNuclear TheoryLUND MONTE-CARLO; CHARGE ASYMMETRY; HADRONIC DECAYS; Z0; ANNIHILATION; EVENTS; JETSLambda01 natural sciencesAsymmetryRing-imaging Cherenkov detectorPartícules (Física nuclear)EVENTSNuclear physics0103 physical sciencesDELPHI; asymmetry; Z0 resonance; s-quark[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]NeutronZ0ANNIHILATION010306 general physicsNuclear ExperimentCHARGE ASYMMETRYEngineering (miscellaneous)DELPHImedia_commonPhysics010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyWeinberg angleLARGE ELECTRON POSITRON COLLIDERZ0 resonancePARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHIJETSPARTICLE PHYSICSHigh Energy Physics::ExperimentCol·lisionadors d'hadronsHADRONIC DECAYSasymmetryParticle Physics - Experiment
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Energy-energy correlations in hadronic final states from Z0 decays

1990

We have studied the energy-energy angular correlations in hadronic final states from Z0 decay using the DELPHI detector at LEP. From a comparison with Monte Carlo calculations based on the exact second order QCD matrix element and string fragmentation we find that Λ(5)/MS = 104-20 +25 (stat.)-20 +25(syst.)-00 +30(theor.) MeV, which corresponds to αs(91 GeV) = 0.106± 0.003 (stat.)±0.003(syst.)-0.000 +0.003(theor.). The theoretical error stems from different choices for the renormalization scale of αs. In the Monte Carlo simulation the scale of αs as well as the fragmentation parameters have been optimized to described reasonably well all aspects of multihadron production.

Nuclear and High Energy PhysicsParticle physicsLUND MONTE-CARLO2ND ORDER QCDElectron–positron annihilationHadronMonte Carlo methodElementary particleSTRONG-COUPLING-CONSTANT; ELECTRON-POSITRON ANNIHILATION; LUND MONTE-CARLO; FREE PERTURBATION-THEORY; 2ND ORDER QCD; E+E-ANNIHILATION; QUANTUM CHROMODYNAMICS; ALPHA-S; FRAGMENTATION MODELS; JET FRAGMENTATIONFRAGMENTATION MODELS01 natural sciencesJET FRAGMENTATIONNuclear physicsParticle decay0103 physical sciencesSTRONG-COUPLING-CONSTANTALPHA-S010306 general physicsNuclear ExperimentELECTRON-POSITRON ANNIHILATIONQuantum chromodynamicsCoupling constantPhysicsQUANTUM CHROMODYNAMICSAnnihilation010308 nuclear & particles physicsE+E-ANNIHILATIONFREE PERTURBATION-THEORYPhysique des particules élémentairesFísica nuclearHigh Energy Physics::ExperimentParticle Physics - Experiment
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