Neutral-current four-fermion production in e+e- interactions at LEP

Achard, P. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (2005) Neutral-current four-fermion production in e+e- interactions at LEP Physics Letters B, 616 (3-4). pp. 159-173. ISSN 0370-2693

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Neutral-current four-fermion production, e+ e-→ƒƒ̅ƒ'ƒ̅', is studied in 0.7 fb-1 of data collected with the L3 detector at LEP at centre-of-mass energies √s=183-209 GeV. Four final states are considered: qq̅νν̅qq̅ℓ+-, ℓ+-+'ℓ-', and ℓ+-ν+ν-, 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-→Zγ*→ ƒƒ̅ƒ'ƒ̅'process is studied and its total cross section at the average centre-of-mass energy √s=196.6 GeV 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 qq̅ℓ+-final states are analysed to search for the possible production of a new neutral heavy particle, for which no evidence is found.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:84042
Deposited On:24 Feb 2012 05:54
Last Modified:24 Feb 2012 05:54

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