0000000000423497

AUTHOR

M. Convery

showing 3 related works from this author

Search for Production of Invisible Final States in Single-Photon Decays of Υ(1S)

2010

We search for single-photon decays of the Upsilon(1S) resonance, Upsilon->gamma+invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A0, or a pair of dark matter particles, chi chi-bar. Both A0 and chi are assumed to have zero spin. We tag Upsilon(1S) decays with a dipion transition Upsilon(2S)->pi+pi-Upsilon(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range m_A0<=9.2 GeV and m_chi<=4.5 GeV in the sample of 98e6 Upsilon(2S) decays collected with the BaBar detector and set stringent limits on new physics models that contain light dark ma…

Particle physicsPhotonAstrophysics::High Energy Astrophysical PhenomenaPhysics beyond the Standard ModelElectron–positron annihilationDark matterFOS: Physical sciencesGeneral Physics and Astronomy01 natural sciencesResonance (particle physics)High Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)PACS: 13.20.Gd 12.60.Jv 14.80.Da 95.35.+d0103 physical sciencessingle-photon decays of Upsilon(1S)[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsLight dark matterPhysicsMissing energy010308 nuclear & particles physicsParticle physicsBABAR detectorHEPBaBarHiggs bosonHigh Energy Physics::ExperimentFísica de partículesExperimentsBaBar detector at SLAC
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THE FASTBUS READ-OUT SYSTEM FOR THE ALEPH TIME PROJECTION CHAMBER

1989

The readout system for the Aleph central tracking detector, a large time projection chamber (TPC), consists of more than 100 FASTBUS crates with approximately 1000 FASTBUS modules. The detector and its associated electronics are briefly presented, followed by a more detailed description of the readout and control system. The discussion covers the sector readout, electronics calibration, front-end data acquisition, data pipelining, and service request handling. Experiences with the system are discussed. >

PhysicsNuclear and High Energy PhysicsAlephTime projection chamberPhysics::Instrumentation and Detectorsbusiness.industryDetectorAstrophysics::Instrumentation and Methods for AstrophysicsTracking (particle physics)Data acquisitionNuclear Energy and EngineeringNuclear electronicsControl systemElectronic engineeringElectronicsElectrical and Electronic EngineeringbusinessComputer hardware
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ALEPH: a Detector for Electron-Positron Annihilations at LEP

1990

Process-centred Software Engineering Environments (PSEE) are the most recent generation of environments supporting software development activities. Most of PSEE are based on mechanisms promoting enforcement and automation of process activities. In this kind of mechanisms the process models are prescribed in a detailed and complete way. But the experience shows that supporting processes is more concerned with the flexibility of guidance offered during the process performance than with enforcement of a collection of predefined process models. In this paper, we present a solution to support strategic processes in a PSEE by providing a flexible guidance during process enactment.

PhysicsFlexibility (engineering)Nuclear and High Energy PhysicsAlephhigh-energy physicsProcess modelingProcess (engineering)business.industrySoftware developmentLEPAutomationparticle detectorsData acquisitionDetectors and Experimental TechniquesLEP; particle detectors; high-energy physicsSoftware engineeringbusinessEnforcementInstrumentationparticle detector
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