0000000000915824

AUTHOR

F Hansen

showing 4 related works from this author

A Study of Bose-Einstein Correlations In e+e- Annihilation At 91 Gev

1992

This paper describes a study of Bose-Einstein correlations made using the ALEPH detector at LEP. The correlations are found to enhance the two particle differential cross section for pairs of identical pions by a factor which can be roughly parametrized by R(Q) = 1 + lambda exp(-Q2-sigma(2)), where Q is the difference in the 3-momenta of the two pions in their centre of mass frame, lambda = 0.51 +/- 0.04 +/- 0.11 and sigma = 3.3 +/- 0.2 +/- 0.8 GeV-1, which corresponds to a source size of 0.65 +/- 0.04 +/- 0.16 fm. The large systematic errors on these results reflect their strong dependence on the choice of the reference sample used in the analysis. This problem is believed to occur primari…

PhysicsParticle physicsAnnihilationPhysics and Astronomy (miscellaneous)Electron–positron annihilationStrong interactionElementary particleBose–Einstein correlationsLEPResonance (particle physics)Nuclear physicsPionMONTE-CARLOCOHERENCEPARTICLESHigh Energy Physics::ExperimentQuantum field theoryNuclear ExperimentEngineering (miscellaneous)Particle Physics - ExperimentMULTIPLE PRODUCTION
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The LOFT mission concept: a status update

2016

The Large Observatory For x-ray Timing (LOFT) is a mission concept which was proposed to ESA as M3 and M4 candidate in the framework of the Cosmic Vision 2015-2025 program. Thanks to the unprecedented combination of effective area and spectral resolution of its main instrument and the uniquely large field of view of its wide field monitor, LOFT will be able to study the behaviour of matter in extreme conditions such as the strong gravitational field in the innermost regions close to black holes and neutron stars and the supra-nuclear densities in the interiors of neutron stars. The science payload is based on a Large Area Detector (LAD, >8m2 effective area, 2-30 keV, 240 eV spectral resolut…

X-ray timing[ SDU.ASTR.GA ] Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA]Field of viewAstrophysics01 natural scienceslaw.inventionlawObservatorytiming010303 astronomy & astrophysicsQBPhysicsmicrochannel plates. PROPORTIONAL COUNTER ARRAYCALIBRATIONX-ray astronomyElectronic Optical and Magnetic MaterialApplied MathematicsAstrophysics::Instrumentation and Methods for AstrophysicsComputer Science Applications1707 Computer Vision and Pattern RecognitionX-ray detectorsCondensed Matter Physicscompact objectsX-ray spectroscopy[SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA]spectroscopyCosmic Vision[ INFO ] Computer Science [cs]Silicon detectorAstrophysics::High Energy Astrophysical PhenomenaCondensed Matter PhysicTelescopeX-rayX-ray astronomySilicon detectors; spectroscopy; timing; X-ray astronomy; Electronic Optical and Magnetic Materials; Condensed Matter Physics; Applied Mathematics; Electrical and Electronic EngineeringSettore FIS/05 - Astronomia e Astrofisica0103 physical sciencesElectronic[INFO]Computer Science [cs]Optical and Magnetic MaterialsSpectral resolutionElectrical and Electronic EngineeringDETECTORta115X-ray astronomy Silicon detectors timing spectroscopy010308 nuclear & particles physicsX-ray imagingX-ray timing; X-ray spectroscopy; X-ray imaging; compact objects; X-ray detectors; microchannel plates. PROPORTIONAL COUNTER ARRAY; CALIBRATION; DETECTORApplied MathematicNeutron starQB460-466 AstrophysicsSilicon detectors; spectroscopy; timing; X-ray astronomy; Electronic Optical and Magnetic Materials; Condensed Matter Physics; Computer Science Applications1707 Computer Vision and Pattern Recognition; Applied Mathematics; Electrical and Electronic EngineeringSilicon detectors; spectroscopy; timing; X-ray astronomySilicon detectorsLarge Observatory For x-ray Timing (LOFT) Large Area Detector (LAD) Wide Field Monitor (WFM) Large Area Silicon Drift Detectors (SDD)Gamma-ray burst
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MEASUREMENT OF TAU BRANCHING RATIOS

1992

著者人数：112名

PhysicsParticle physicsPhysics and Astronomy (miscellaneous)Branching fractionElectron–positron annihilationLEPTON PRODUCTIONPIONSHadronEconomic intelligenceCELLO DETECTORBranching (polymer chemistry)Charged particlePARAMETERSNuclear physicsPionPETRAHigh Energy Physics::ExperimentEngineering (miscellaneous)Particle Physics - ExperimentLeptonDECAY MODES
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Measurement of the charged particle multiplicity distribution in hadronic Z decays

1991

The charged particle multiplicity distribution of hadronic Z decays was measured on the peak of the Z resonance using the ALEPH detector at LEP. Using a model independent unfolding procedure the distribution was found to have a mean = 20.85 +/- 0.24 and a dispersion D = 6.34 +/- 0.12. Comparison with lower energy data supports the KNO scaling hypothesis in the energy range square-root s = 29-91.25 GeV. At square-root s = 91.25 GeV the shape of the multiplicity distribution is well described by a log-normal distribution, as predicted from a cascading model for multi-particle production. The same model also successfully describes the energy dependence of the mean and width of the multiplicity…

Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsRange (particle radiation)Particle physicsE+E ANNIHILATIONPP COLLISIONSDistribution (number theory)Electron–positron annihilationQUARKHadronPETRA ENERGIESResonance (particle physics)Charged particleNuclear physicsMONTE-CARLOHigh Energy Physics::ExperimentFRAGMENTATIONScalingParticle Physics - Experiment
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