0000000000956717

AUTHOR

C. V. Velde

showing 2 related works from this author

A study of the Lorentz structure in tau decays

2000

This paper describes a measurement of the Michel parameters, \eta, \rho, \xi, \xi\delta, and the average \nu_{\tau} helicity, h_{\nu_{\tau}}, in tau lepton decays together with the first measurement of the tensor coupling in the weak charged current. The tau+tau- pairs were produced at the LEP e+e- collider at CERN from 1992 through 1995 in the DELPHI detector. Assuming lepton universality in the decays of the tau the measured values of the parameters were: \eta = -0.005 +/- 0.036 +/- 0.037, \rho = 0.775 +/- 0.023 +/- 0.020, \xi = 0.929 +/- 0.070 +/- 0.030, \xi\delta = 0.779 +/- 0.070 +/- 0.028, h_{\nu_{\tau}} = -0.997 +/- 0.027 +/- 0.011. The strength of the tensor coupling was measured to…

Particle physicsPhysics and Astronomy (miscellaneous)CHARGED WEAK-INTERACTIONSLUND MONTE-CARLOENERGIESLorentz transformationFOS: Physical sciences01 natural sciencesJET FRAGMENTATIONPartícules (Física nuclear)law.inventionHigh Energy Physics - Experimentsymbols.namesakeHigh Energy Physics - Experiment (hep-ex)NEUTRINO HELICITYLUND MONTE-CARLO; CHARGED WEAK-INTERACTIONS; RIGHT-SYMMETRICAL MODEL; MICHEL PARAMETERS; NEUTRINO HELICITY; RADIATIVE-CORRECTIONS; JET FRAGMENTATION; ENERGIES; LEPTON; PARTICLESlaw0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]RADIATIVE-CORRECTIONSPARTICLESTensor010306 general physicsColliderLEPTONEngineering (miscellaneous)Charged currentDELPHIPhysics010308 nuclear & particles physicsMICHEL PARAMETERSCoupling (probability)HelicityLARGE ELECTRON POSITRON COLLIDERRIGHT-SYMMETRICAL MODELPARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHIsymbolsMichel parametersPARTICLE PHYSICSFísica nuclearHigh Energy Physics::ExperimentAstrophysics::Earth and Planetary AstrophysicsParticle Physics - ExperimentLeptonEuropean physical journal : C : particles and fields
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Measurement of the mass of the W boson using direct reconstruction at √s = 183 GeV

1999

From data corresponding to an integrated luminosity of 53.5 pb(-1) taken during the 183 GeV run in 1997, DELPHI has measured the W mass from direct reconstruction of WW --> lq (q) over bar and WW --> q (q) over bar q (q) over bar events. Combining these channels, a value of m(w) = 80.238 +/- 0.154(stat) +/- 0.035(syst) +/- 0.035(fsi) +/- 0.021 (LEP) GeV/c(2) is obtained, where fsi denotes final state interaction. Combined with the W mass obtained by DELPHI from the WW production cross-section and with the direct measurement at 172 GeV this leads to a measured value of m(w) = 80.270 +/- 0.137(stat) +/- 0.031(syst) +/- 0.030(fsi) +/- 0.021(LEP)GeV/c(2), in good agreement with the Standard Mod…

Nuclear and High Energy PhysicsParticle physicsEINSTEIN CORRELATIONSCLUSTERING-ALGORITHMElectron–positron annihilationMathematicsofComputing_GENERALCOLOR DIPOLE MODEL01 natural sciencesComputer Science::Digital LibrariesPartícules (Física nuclear)LuminosityStandard ModelPHYSICSEVENTSNuclear physicsLEP20103 physical sciencesMONTE-CARLO PROGRAM[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]ANNIHILATION010306 general physicsDELPHIPhysicsAnnihilation010308 nuclear & particles physicsE(+)E(-) INTERACTIONSTheoryofComputation_GENERALLARGE ELECTRON POSITRON COLLIDERMONTE-CARLO PROGRAM; PAIR CROSS-SECTION; COLOR DIPOLE MODEL; E(+)E(-) INTERACTIONS; EINSTEIN CORRELATIONS; CLUSTERING-ALGORITHM; ANNIHILATION; PHYSICS; EVENTS; LEP2PARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHIComputer Science::Mathematical SoftwarePARTICLE PHYSICSProduction (computer science)Física nuclearPAIR CROSS-SECTIONParticle Physics - ExperimentBar (unit)
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