Search results for "Dipole mode"

showing 4 items of 4 documents

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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The new FL measurement from HERA and the dipole model

2012

From the new measurement of F_L at HERA we derive fixed-Q^2 averages . We compare these with bounds which are rigorous in the framework of the standard dipole picture. The bounds are sharpened by including information on the charm structure function F_2^(c). Within the experimental errors the bounds are respected by the data. But for 3.5 GeV^2 <= Q^2 <= 20 GeV^2 the central values of the data are close to and in some cases even above the bounds. Data on F_L/F_2 significantly exceeding the bounds would rule out the standard dipole picture at these kinematic points. We discuss, furthermore, how data respecting the bounds but coming close to them can give information on questions like colour t…

PhysicsNuclear and High Energy PhysicsHigh Energy Physics::PhenomenologyStructure functionFOS: Physical sciencesHERADipole modelHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)High Energy Physics - PhenomenologyCross section (physics)DipoleTheoretical physicsHigh Energy Physics - Phenomenology (hep-ph)Saturation (graph theory)High Energy Physics::ExperimentCharm (quantum number)Physics Letters B
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Electroweak measurements in electron-positron collisions at W-boson-pair energies at LEP

2013

The ALEPH, DELPHI, L3, OPAL collaborations and LEP Electroweak Working Group.-- arXiv:1302.3415

Top quarkPARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; ALEPH; DELPHI; L3; OPALElectron–positron annihilationPrecision measurements at W-pair energiesWW bosonGeneral Physics and AstronomyCOLOR DIPOLE MODEL01 natural sciences7. Clean energyZZ bosonMathematical SciencesHigh Energy Physics - Experimentelectroweak interactionsHigh Energy Physics - Experiment (hep-ex)High Energy Physics - Phenomenology (hep-ph)electron-positron physics[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]FERMION-LOOP SCHEMEANOMALOUS MAGNETIC-MOMENTOF-MASS ENERGIES; TOP-QUARK MASS; CARLO EVENT GENERATOR; HADRONIC Z-DECAYS; INVARIANT YFS EXPONENTIATION; ANOMALOUS MAGNETIC-MOMENT; (UN)STABLE W+W-PRODUCTION; FERMION-LOOP SCHEME; COLOR DIPOLE MODEL; LEADING ORDER QCDeffective coupling constantsBosonPhysicsOPALPhysicsElectroweak interactionSettore FIS/01 - Fisica Sperimentalehep-phPrecision measurements at WW-pair energiesRadiative correctionsALEPHNuclear & Particles PhysicsLARGE ELECTRON POSITRON COLLIDER3. Good healthRadiative correctionHigh Energy Physics - PhenomenologyOF-MASS ENERGIESDecays of heavy intermediate gauge bosonsINVARIANT YFS EXPONENTIATIONPrecision measurements at W-pair energieFermion-antifermion productionL3Physical SciencesComputingMethodologies_DOCUMENTANDTEXTPROCESSINGPARTICLE PHYSICSFísica nuclearProduction (computer science)decays of heavy intermediate gauge bosons; neutral weak current; w boson; tests of the standard model; precision measurements at w-pair energies; fermion-antifermion production; top quark; electron-positron physics; electroweak interactions; effective coupling constants; higgs boson; z boson; radiative correctionsFermion–antifermion productionELECTROWEAK INTERACTIONTests of the Standard ModelParticle Physics - ExperimentParticle physicsZ bosonElectron-positron physicElectroweak interactionsLEADING ORDER QCDHiggs boson(UN)STABLE W+W-PRODUCTIONFOS: Physical sciencesdecays of heavy intermediate gauge bosonsddc:500.2Decays of heavy intermediate gauge bosonEffective coupling constantPartícules (Física nuclear)Standard ModelNuclear physicsPhysics and Astronomy (all)Neutral weak current0103 physical sciencesddc:530010306 general physicsTOP-QUARK MASSEffective coupling constantsDELPHIElectron–positron physicshep-ex010308 nuclear & particles physicsBranching fractionHigh Energy Physics::PhenomenologyCARLO EVENT GENERATORTop quarkradiative correctionsElectron-positron physics; Electroweak interactions; Decays of heavy intermediate gauge bosons; Fermion-antifermion production; Precision measurements at W-pair energies; Tests of the Standard Model; Radiative corrections; Effective coupling constants; Neutral weak current; Z boson; W boson; Top quark; Higgs bosonHADRONIC Z-DECAYSCol·lisions (Física nuclear)[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]Experimental High Energy PhysicsLarge Electron–Positron ColliderW bosonHigh Energy Physics::ExperimentElectron-positron physics
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A sum rule approach to total muon capture rates

1986

Abstract The total muon capture rate is expanded in terms of sum rules and the convergence of such an expansion is analyzed. It results that the energy-weighted and the inverse-energy-weighted sum rules provide an accurate estimate for the total rate in agreement with a complete RPA calculation through the response function. The static polarizability of the isovector dipole mode turns out to be the relevant quantity to determine the total muon capture rate, in light and medium nuclei.

[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th]PhysicsNuclear and High Energy PhysicsIsovector[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]010308 nuclear & particles physicsNuclear TheoryFunction (mathematics)01 natural sciencesMuon captureNuclear physicsDipole modePolarizability0103 physical sciencesConvergence (routing)Rule of sumSum rule in quantum mechanicsAtomic physics010306 general physics
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