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- W1655853774 abstract "I review experimental results on the reactions e+e− → e+e−e+e− and e+e− → e+e− μ+μ− from PETRA and PEP. Recent high statistics measurements are compared to QED predictions in the form of diagrammatic leading order (α4) calculations and to the equivalent photon approximation. The leading order calculation describes the data well over the full kinematic range covered by experiments (0.1 ≲ Q2 ≲ 100 GeV2/c2).The “two photon interaction”graph is found to saturate the observed cross section. Only for small masses of the produced leptonic system, first indications of a bremsstrahlung type background are observed at the percent level. The leptonic structure function F2γ(x, Q2) is measured and also agrees with the behavior expected from QED. photon approximation. Under most conditions, the “two-photon interaction” graph alone adequately accounts for the data. Only at x = 1, a “bremsstrahlung” background at the percent level is observed. The structure function approach gives an appropriate description of the data on eγ → eμμ. The measured “muonic” structure function <F 2 γ (x, Q2)> agrees with the behavior expected from QED." @default.
- W1655853774 created "2016-06-24" @default.
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- W1655853774 date "2008-04-06" @default.
- W1655853774 modified "2023-09-23" @default.
- W1655853774 title "QED processes in two photon reactions" @default.
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- W1655853774 doi "https://doi.org/10.1007/3-540-12691-0_9" @default.
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