0000000000667749

AUTHOR

L. L. M. Mir

showing 3 related works from this author

Measurement of Z-pair production in e(+)e(-) collisions and constraints on anomalous neutral gauge couplings

2009

The ZZ production cross section is measured from a data sample corresponding to a total integrated luminosity of 452 pb−1, collected by the ALEPH experiment at LEP at centre-of-mass energies from 192 to 209 GeV. Individual cross sections, extracted at six centre-of-mass energies, are found to be in agreement with Standard Model calculations. The results are used to set limits on anomalous neutral gauge couplings. The ZZ production cross section is measured from a data sample corresponding to a total integrated luminosity of 452 pb−1 , collected by the ALEPH experiment at LEP at centre-of-mass energies from 192 to 209 GeV. Individual cross sections, extracted at six centre-of-mass energies, …

PhysicsAlephParticle physicsNuclear and High Energy PhysicsLuminosity (scattering theory)e+-e- Experiments010308 nuclear & particles physicsElectron–positron annihilationSettore FIS/01 - Fisica SperimentaleGauge (firearms)01 natural sciencesStandard ModelNuclear physicsE +e -experiments; Nuclear and High Energy PhysicsE +e -experimentsCross section (physics)Pair production0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::Experiment010306 general physicsALEPH experimentParticle Physics - Experiment
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An experimental study of γγ → hadrons at LEP

1993

An analysis of γγ interactions has been performed using untagged hadronic data obtained by the ALEPH detector at LEP. The data show at low transverse momentum (pt) are well reproduced by a model based on the vector meson dominance mechinism (VDM). At high pt thrust the presence of hard scattering processes is demonstrated. This component is well described in shape and normalization by a QCD calculation.

Quantum chromodynamicsPhysicsNormalization (statistics)Nuclear and High Energy PhysicsParticle physicsROSS-SECTIONE+E-PHYSICSScatteringHigh Energy Physics::PhenomenologyHadronElementary particleVector meson dominancePhoton structure functionJET FRAGMENTATIONNuclear physicsALEPH ExperimentPHOTONLUND MONTE-CARLOCSCATTERINGHigh Energy Physics::ExperimentALEPH experiment
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Bose-Einstein correlations in W-pair decays

2000

Bose-Einstein correlations are studied in semileptonic (WW --> q (q) over bar lv) and fully hadronic (WW --> q (q) over bar q (q) over bar) W-pair decays with the ALEPH detector at LEP at centre-of-mass energies of 172, 183 and 189 GeV. They are compared with those made at the Z peak after correction for the different flavour compositions. A Monte Carlo model of Bose-Einstein correlations based on the JETSET hadronization scheme was tuned to the Z data and reproduces the correlations in the WW --> q (q) over bar lv events. The same Monte Carlo reproduces the correlations in the WW --> q (q) over bar q (q) over bar channel assuming independent fragmentation of the two W's. A variant of this …

Condensed Matter::Quantum GasesPhysicsNuclear and High Energy PhysicsParticle physicsBose Einstein correlations010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyLEPBose–Einstein correlations01 natural sciencesALEPH ExperimentNuclear physicsALEPH Experiment; LEP; Bose Einstein correlations0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]High Energy Physics::Experiment010306 general physicsALEPH experimentParticle Physics - Experiment
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