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Study of the e+e- -> Ze+e- process at LEP
(2003)Physics Letters BThe cross section of the process e+e- → Ze+e- is measured with 0.7 fb-1 of data collected with the L3 detector at LEP. Decays of the Z boson into quarks and muons are considered at centre-of-mass energies ranging from 183 GeV up to 209 GeV. The measurements are found to agree with Standard Model predictions, achieving a precision of about 10% for the hadronic channel.Journal Article -
Measurement of charged-particle multiplicity distributions and their H-q moments in hadronic Z decays at LEP
(2003)Physics Letters BThe charged-particle multiplicity distribution is measured for all hadronic events as well as for light-quark and b-quark events produced in e +e- collisions at the Z pole. Moments of the charged-particle multiplicity distributions are calculated. The Hq moments of the multiplicity distributions are studied, and their quasi-oscillations as a function of the rank of the moment are investigatedJournal Article -
Inclusive charged hadron production in two-photon collisions at LEP
(2003)Physics Letters BInclusive charged hadron production, e+e- →e+e-h±X, is studied using 414 pb-1 of data collected at LEP with the L3 detector at centre-of-mass energies between 189 and 202 GeV. Single particle inclusive differential cross sections are measured as a function of the particle transverse momentum, pt , and pseudo-rapidity, η. For pt≤ 1.5 GeV, the data are well described by an exponential, typical of soft hadronic processes. For higher pt , the ...Journal Article -
Measurement of the cross section of W-boson pair production at LEP
(2004)Physics Letters BThe cross section of W-boson pair-production is measured with the L3 detector at LEP. In a data sample corresponding to a total luminosity of 629.4 pb−1, collected at centre-of-mass energies ranging from 189 to 209 GeV, 9834 four-fermion events with W bosons decaying into hadrons or leptons are selected. The total cross section is measured with a precision of 1.4% and agrees with the Standard Model expectation. Assuming charged-lepton ...Journal Article -
Search for charged Higgs bosons at LEP
(2003)Physics Letters BA search for pair-produced charged Higgs bosons is performed with the L3 detector at LEP using data collected at centre-of-mass energies between 189 and 209 GeV, corresponding to an integrated luminosity of 629.4 pb-1. Decays into a charm and a strange quark or into a tau lepton and its neutrino are considered. No significant excess is observed and lower limits on the mass of the charged Higgs boson are derived at the 95% confidence level. ...Journal Article -
Measurement of hadron and lepton-pair production in e+e- collisions at root s=192-208 GeV at LEP
(2006)The European Physical Journal CHadron production and lepton-pair production in e+e- collisions are studied with data collected with the L3 detector at LEP at centre-of-mass energies s√=192−208GeV. Using a total integrated luminosity of 453 pb-1, 36057 hadronic events and 12863 lepton-pair events are selected. The cross sections for hadron production and lepton-pair production are measured for the full sample and for events where no high-energy initial-state-radiation ...Journal Article -
Study of inclusive strange-baryon production and search for pentaquarks in two-photon collisions at LEP
(2007)The European Physical Journal CMeasurements of inclusive production of the Λ, Ξ- and Ξ*(1530) baryons in two-photon collisions with the L3 detector at LEP are presented. The inclusive differential cross sections for Λ and Ξ- are measured as a function of the baryon transverse momentum, pt, and pseudo-rapidity, η. The mean number of Λ, Ξ- and Ξ*(1530) baryons per hadronic two-photon event is determined in the kinematic range 0.4 GeV<pt<2.5 GeV, |η|<1.2. Overall agreement ...Journal Article -
Flavor Independent Search for Neutral Higgs Bosons at LEP
(2004)Physics Letters BA flavour independent search for the CP-even and CP-odd neutral Higgs bosons h and A is performed in 624 pb−1 of data collected with the L3 detector at LEP at centre-of-mass energies between 189 and 209 GeV. Higgs boson production through the e+e−→Zh and the e+e−→hA processes is considered and decays of the Higgs bosons into hadrons are studied. No significant signal is observed and 95% confidence level limits on the hZZ and hAZ couplings ...Journal Article -
Search for anomalous couplings in the Higgs sector at LEP
(2004)Physics Letters BAnomalous couplings of the Higgs boson are searched for through the processes e+e-→Hγ, e+e -→e+e-H and e+e -→HZ. The mass range 70 GeV<mH<190 GeV is explored using 602 pb-1 of integrated luminosity collected with the L3 detector at LEP at centre-of-mass energies s=189-209 GeV. The Higgs decay channels H→ff̄, H→γγ, H→Zγ and H→WW(*) are considered and no evidence is found for anomalous Higgs production or decay. Limits on the anomalous ...Journal Article -
Measurement of exclusive ρ+ρ- production in high-Q2 two-photon collisions at LEP
(2004)Physics Letters BJournal Article