Scientific article
Open access

Double-tag events in two-photon collisions at LEP

ContributorsL3 Collaboration
Published inPhysics letters. B, vol. 531, no. 1-2, p. 39-51
Publication date2002

Double-tag events in two-photon collisions are studied using the L3 detector at LEP centre-of-mass energies from QY*Y* GeV to 209 GeV. The cross sections of the e+e−→e+e−hadrons and QY*Y* processes are measured as a function of the product of the photon virtualities, QY*Y*, of the two-photon mass, Wγγ, and of the variable Y=ln(W2γγ/Q2). The average photon virtuality is 〈Q21〉=〈Q22〉=16 GeV2. The results are in agreement with next-to-leading order calculations for the process √s=189 in the interval 2⩽Y⩽5. An excess is observed in the interval 5

Citation (ISO format)
L3 Collaboration. Double-tag events in two-photon collisions at LEP. In: Physics letters. B, 2002, vol. 531, n° 1-2, p. 39–51. doi: 10.1016/S0370-2693(02)01340-0
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Article (Published version)
ISSN of the journal0370-2693

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