Study of double-tagged gamma gamma events at LEP II.

The DELPHI collaboration
Eur.Phys.J.C 46 (2006) 559-568, 2006.

Abstract (data abstract)
CERN-LEP. Measurement of the cross section for hadron production in double-tagged photon-photon events with photons of virtuality Q**2 between 10 and 200 GeV**2. The data were collected during the 1998-2000 LEP2 running period with incident colliding E+ E- beam centre of mass energies from 189 to 209 GeV and have an integrated luminosity of 550 pb-1. Cross sections for double-tagged photons to MU+ MU- are also measured and found to agree with QED predictions.. Data are presented as a function of the dimensionless variable.. Y = LN(W**2/SQRT((Q1**2)*(Q2**2))) where W is the mass of the two photon system and Q1 and Q2 are the virtualities of the individual photons.. Numerical values for figure 5 supplied by J. Timmermans.

  • Table 1

    Data from T 1,F 8


    Measured cross section for the process E+ E- --> E+ E- HADRONS.

  • Table 2

    Data from T 1,F 9


    Measured cross section for the process GAMMA* GAMMA* --> HADRONS.

  • Table 3

    Data from F 5


    Differential cross section for GAMMA* GAMMA* --> MU+ MU-.

  • Table 4

    Data from P 7(C=PREPRINT)


    Total cross section for MU+ MU- and HADRON production in the defined kinematic range. Corrections for detector effects based on...

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