0000000000201401

AUTHOR

R.w Jones

showing 2 related works from this author

Search for pair-production of long-lived heavy charged particles in e+e− annihilation

1997

A search for pair-production of long-lived, heavy, singly-charged particles has been performed with data collected by the ALEPH detector at a centre-of-mass energy of 172 GeV. Data at \sqrt{s} = 161, 136, and 130 GeV are also included to improve the sensitivity to lower masses. No candidate is found in the data. A model-independent 95% confidence level upper limit on the production cross section at 172 GeV of 0.2-0.4pb is derived for masses between 45 and 86 GeV/c^2. This cross section limit implies, assuming the MSSM, a lower limit of 67 (69) GeV/c^2 on the mass of right- (left-) handed long-lived scalar taus or scalar muons and of 86 GeV/c^2 on the mass of long-lived charginos.

Nuclear and High Energy PhysicsParticle physicsElectron–positron annihilationScalar (mathematics)heavy charged particlescultural studiesFOS: Physical sciences01 natural sciencesHigh Energy Physics - ExperimentNuclear physicsALEPH ExperimentHigh Energy Physics - Experiment (hep-ex)Charginouniversity0103 physical sciencesprofessor[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Nuclear Experiment010306 general physicsALEPH experimentPhysicsALEPH Experiment; LEP; heavy charged particlesscholarAnnihilationMuon010308 nuclear & particles physicsPhysicsLEPCharged particlePair productionresearcherHigh Energy Physics::ExperimentFranceParticle Physics - Experimentcommunication studies
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Measurement of the transverse spin correlations in the decay Z → τ+τ-

1997

For tau leptons produced in e(+)e(-) --> tau(+)tau(-) interactions there are, in addition to the longitudinal spin correlations, two independent transverse spin correlations associated with the transverse (within the production plane) and normal (to the production plane) polarization components. A measurement of the transverse-transverse and transverse-normal tau spin correlations in the decay Z --> tau(+)tau(-), C-TT and C-TN, is presented based on the aplanarity angle of the decay products of both tau leptons. Using 80 pb(-1) of data collected by ALEPH on the peak of the Z resonance, the results are C-TT = 1.06 +/- 0.13(stat) +/- 0.05(syst), and C-TN = 0.08 +/- 0.13(stat) +/- 0.04(syst). …

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsPhysicsElectron–positron annihilationPolarization (waves)01 natural sciencesNuclear physicsALEPH ExperimentTransverse plane0103 physical sciencesHigh Energy Physics::ExperimentAstrophysics::Earth and Planetary AstrophysicsNuclear Experiment010306 general physicsALEPH experimentLepton
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