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Neutral-current four-fermion production in e$^+e^-$ interactions at LEP (2006)

Abstract
Neutral-current four-fermion production, e+e- -> ffff is studied in 0.7/fb of data collected with the L3 detector at LEP at centre-of-mass energies root(s)=183-209GeV. Four final states are considered: qqvv, qqll, llll and llvv, where l denotes either an electron or a muon. Their cross sections are measured and found to agree with the Standard Model predictions. In addition, the e+e- -> Zgamma* -> ffff process is studied and its total cross section at the average centre-of-mass energy 196.6GeV is found to be 0.29 +/- 0.05 +/- 0.03 pb, where the first uncertainty is statistical and the second systematic, in agreement with the Standard Model prediction of 0.22 pb. Finally, the mass spectra of the qqll final states are analysed to search for the possible production of a new neutral heavy particle, for which no evidence is found.

Publication details
Download http://hal.in2p3.fr/in2p3-00024173/en/
Publisher HAL - CCSd - CNRS
Contributors Sylvie Florès
Repository CCSd/HAL : e-articles server (based on gBUS) (France)
Keywords Physics/High Energy Physics - Experiment
Type ART_ACL