Dainton, J.B.
E+ E- --> E+ E- HADRONS
[10.0, 100.0]
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Measurement of the cross-section for the process gamma* gamma* --> hadrons at LEP.

The L3 collaboration Acciarri, M. ; Achard, P. ; Adriani, O. ; et al.
Phys.Lett.B 453 (1999) 333-342, 1999.
Inspire Record 482478 DOI 10.17182/hepdata.49195

Measurements of the two-photon interaction e + e − → e + e − + hadrons at s ≃ 91 GeV and s ≃ 183 GeV are presented. The double-tag events, collected with the L3 detector, correspond to interated luminosities of 140 pb −1 at 91 GeV and 52 pb −1 at 183 GeV. The cross-section of γ ∗ γ ∗ collisions has been measured at 〈 Q 2 〉 = 3.5 GeV 2 and 〈 Q 2 〉 = 14 GeV 2 . The data agree well with predictions based on perturbative QCD, while the Quark Parton Model alone is insufficient to describe the data.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


AN ANALYSIS OF MULTI - HADRONIC EVENTS PRODUCED WITH TWO ENERGETIC LEPTONS IN e+ e- ANNIHILATION

The CELLO collaboration Behrend, H.J. ; Criegee, L. ; Dainton, J.B. ; et al.
Phys.Lett.B 212 (1988) 515-522, 1988.
Inspire Record 262955 DOI 10.17182/hepdata.29907

A search for multihadronic events produced with two energetic leptons has been performed at PETRA using 130 pb −1 accumulated by the CELLO detector at 35 GeV ⩽ √ s ⩽46.8 GeV. Three μ + μ − , eleven e + e − and three eμ events were observed. The mesured yields an dthe event characteristics are in good agreement with the expectation for the α 4 QED processes e + e − → ℓ + ℓ − q q and from semileptonic decays of pairs of heavy quarks.

1 data table
Table 1

No description provided.