24,865 research outputs found
Measurement of the Probability of Gluon Splitting into Charmed Quarks in Hadronic Z Decays
No full text
Z-boson production with two unobserved, back-to-back, hard photons at LEP
No full textThe double-radiative process e+e- -> Z gamma gamma -> q q~ gamma gamma, where the two hard photons escape detection at low polar angles into opposite directions, is studied in 0.62/fb of data collected with the L3 detector at LEP at centre-of-mass energies between 188.6GeV and 209.2GeV. The cross sections are measured and found to be consistent with the Standard Model expectation
Measurement of the W+W- gamma Cross Section and Direct Limits on Anomalous Quartic Gauge Boson Couplings at LEP
No full textSearches for Scalar Top and Scalar Bottom Quarks in e+e- Interactions at 161 GeV ≤ sqrt(s) ≤ 183 GeV
No full text
Search for Scalar Leptons, Charginos and Neutralinos in e+e- collisions at sqrt(s) = 161-172 GeV
No full textMeasurement of W polarization at LEP
No full textThe three different helicity states of W bosons produced in the reaction e+ e- -> W+ W- -> l nu q q~ at LEP are studied using leptonic and hadronic W decays. Data at centre-of-mass energies \sqrt s = 183-209 GeV are used to measure the polarisation of W bosons, and its dependence on the W boson production angle. The fraction of longitudinally polarised W bosons is measured to be 0.218 \pm 0.027 \pm 0.016 where the first uncertainty is statistical and the second systematic, in agreement with the Standard Model expectation
Measurement of the Z boson mass using e+ e- ---> Z gamma events at center of mass energies above the Z pole
No full textEvents from the e+e- -> Zgamma process with hard initial state radiation collected with the L3 detector at centre-of-mass energies between 183 GeV and 209 GeV are used to measure the mass of the Z boson. Decays of the Z boson into hadrons or muon pairs are considered and the Z mass is determined to be 91.272 +- 0.032 (stat.) +- 0.033 (syst.) GeV, in agreement with the value measured at the Z resonance. Alternatively, assuming this measured value of the Z mass, the method determines the LEP beam energy, found to be 87 +- 34 (stat.) \pm 34 (syst.) MeV lower than the nominal value
- …
