Double-tag events in two-photon collisions at LEP

Achard, P. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (2002) Double-tag events in two-photon collisions at LEP Physics Letters B, 531 (1-2). pp. 39-51. ISSN 0370-2693

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Double-tag events in two-photon collisions are studied using the L3 detector at LEP centre-of-mass energies from σγ∗γ∗ GeV to 209 GeV. The cross sections of the e+e →e+e hadrons and σγ∗γ∗ processes are measured as a function of the product of the photon virtualities, σγ∗γ∗, 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<Y≰7, corresponding to Wγγ greater than 40 GeV. This may be interpreted as a contribution of resolved photon QCD processes or the onset of BFKL phenomena.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:83530
Deposited On:21 Feb 2012 12:56
Last Modified:21 Feb 2012 12:56

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