5 research outputs found

    The solar flare of the 14th of July 2000 (L3+C detector results)

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    Contains fulltext : 35185.pdf (Publisher’s version ) (Open Access

    Study of spin and decay-plane correlations of W bosons in the e(+) e(-)-> W+W- process at LEP

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    Contains fulltext : 33026.pdf (Publisher’s version ) (Open Access) Contains fulltext : 33026.pdf (Author’s version preprint ) (Open Access

    A search for flaring very-high-energy cosmic gamma-ray sources with the L3+C muon spectrometer

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    The L3+C muon detector at the CERN electron-positron collider, LEP, is used for the detection of very-high-energy cosmic gamma-ray sources through the observation of muons of energies above 20, 30, 50 and 100 GeV. Daily or monthly excesses in the rate of single-muon events pointing to some particular direction in the sky are searched for. The periods from mid July to November 1999, and April to November 2000 are considered. Special attention is also given to a selection of known gamma-ray sources. No statistically significant excess is observed for any direction or any particular source. (c) 2006 Elsevier B.V. All rights reserved

    Measurement of hadron and lepton-pair production in e(+)e(-) collisions at root s=192-208 GeV at LEP

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    Hadron 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 root s = 192-208 GeV. 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 photon is emitted prior to the collisions. Lepton-pair events are further investigated and forward-backward asymmetries are measured. Finally, the differential cross sections for electron-positron pair-production is determined as a function of the scattering angle. An overall good agreement is found with Standard Model predictions

    Analysis of the pi(+) pi(-) pi(+)pi(-) and pi(+)pi(0) pi(-) pi(0) final states in quasi-real two-photon collisions at LEP

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    The reactions gamma gamma -\u3e pi(+)pi(-)pi(+)pi(-) and gamma gamma -\u3e pi(+)pi(0)pi(-)pi(0) are studied with the L3 detector at LEP in a data sample collected at centre-of-mass energies from 161 GeV to 209 GeV with a total integrated luminosity of 698 pb(-1). A spin-parity-helicity analysis of the rho(0)rho(0) and p(+)p(-) systems for two-photon centre-of-mass energies between 1 and 3 GeV shows the dominance of the spin-parity state 2(+) with helicity 2. The contribution of 0(+) and 0(-) spin-parity states is also observed, whereas contributions of 2(-) states and of a state with spin-parity 2(+) and zero helicity are found to be negligible. (c) 2006 Elsevier B.V. All rights reserved
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