0000000000916014

AUTHOR

C Gatto

showing 7 related works from this author

Rates, polarizations, and asymmetries in charmless vector-vector B meson decays

2003

With a sample of approximately 89 million BBbar pairs collected with the BABAR detector, we perform a search for B meson decays into pairs of charmless vector mesons (phi, rho, and K*). We measure the branching fractions, determine the degree of longitudinal polarization, and search for CP violation asymmetries in the processes B->phiK*+, B->phiK*0, B->rho0K*+, and B->rho0rho+. We also set an upper limit on the branching fraction for the decay B->rho0rho0.

Particle physicsMesonBABARElectron–positron annihilationHadronFOS: Physical sciencesGeneral Physics and AstronomyElementary particleResonancePARTICLE PHYSICS; PEP2; BABAR01 natural sciencesNOHigh Energy Physics - ExperimentHigh energy physicHigh Energy Physics - Experiment (hep-ex)Particle decayElectromagnetic calorimeterPolarizationProbability density function0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]PEP2B mesonDecay dynamic010306 general physicsPhysicsCalorimeter010308 nuclear & particles physicsBranching fractionCP-ASYMMETRIES VIOLATION SEARCH B->VVColliding beam acceleratorComputer simulationDecay rateMonte Carlo methodCrystallographyPARTICLE PHYSICSCP violationHigh Energy Physics::ExperimentParticle detectorProton
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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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Preliminary design of an unmanned Wing In Ground effect craft.

2009

This paper describes a systematic technique for preliminary conceptual design of Unmanned Wing in Ground Effect Craft (U-WIGs). Application of the methodology to a small U-WIG to be employed in tasks like coastal patrolling, oceanography, civil protection, control and monitoring, is presented. A mission profile and numerical mission specifications on minimum payload weight conveyable, cruising speed, minimum cruising altitude and autonomy suitable for the intended craft duties are imposed. On the basis of such specifications, take off weight is estimated via the fuel fraction method. Due to the lack of statistical information for small sized unmanned WIGs, data available for UAVs are used, …

WIG UAV Preliminary DesignSettore ING-IND/03 - Meccanica Del Volo
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Searches for B0 decays to combinations of charmless isoscalar mesons

2004

We search for B meson decays into two-body combinations of eta, eta', omega, and phi mesons from 89 million B B-bar pairs collected with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We find the branching fraction BF(B0 -> eta omega) = (4.0^{+1.3}_{-1.2} +- 0.4) x 10^-6 with a significance of 4.3 sigma. For all the other decay modes we set the following 90% confidence level upper limits on the branching fractions, in units of 10^-6 : BF(B0 -> eta eta)<2.8, BF(B0 -> eta eta')<4.6, BF(B0 -> eta' eta')<10, BF(B0 -> eta'omega)<2.8, BF(B0 -> eta phi)<1.0, BF(B0 -> eta' phi)<4.5, BF(B0 -> phi phi)<1.5.

IsoscalarElectron–positron annihilationBABARGeneral Physics and AstronomyQCD FACTORIZATION01 natural sciencesOmega13.25.Hw 11.30.Er 12.15.HhHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)Mathematical modelProbability density function[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]PEP2B mesonNuclear ExperimentQCD FACTORIZATION; STANDARD MODEL; BABAR; SLACPhysicsQuantum chromodynamicsSigmaHamiltonianMonte Carlo methodSensitivity analysiPARTICLE PHYSICSBranching fractionSLACParticle physicsMesonSTANDARD MODELQCD FACTORIZATION STANDARD MODELFOS: Physical sciencesLikelihood distributionPARTICLE PHYSICS; PEP2; BABARSolenoidHigh energy physicNuclear physicsPhysics and Astronomy (all)ElectromagnetismElectromagnetic calorimeterPseudoscalar meson0103 physical sciencesPerturbation technique010306 general physicsCalorimeterError analysi010308 nuclear & particles physicsBranching fractionHEPMagnetic fieldHigh Energy Physics::Experiment
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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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Numerical simulations of the aerodynamics characteristics for a non-conventional unmanned WIG.

2009

In this paper we present our research about a particular ultralight WIG. WIG is the acronym of Wing In Ground effect vehicle. This work is part of a research on the dynamic behaviour for an UAV-WIG with a particular Tandem – Canard arrangement, study which the authors have been carrying out from several years. In previous paper the same Authors built a general mathematical model which permit to obtain analytical equations for all the aerodynamic coefficients both Out of Ground Effect and In Ground Effect conditions. In this paper, a numerical validation of the above mentioned mathematical model is proposed by the application of CFD methods. The mesh has been generated using ICEM 10.0 and th…

WIGUAVSimulationSettore ING-IND/03 - Meccanica Del Volo
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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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