Z-boson production with two unobserved, back-to-back, hard photons at LEP
arXiv:hep-ex/0504015 · doi:10.1016/j.physletb.2005.03.039
Abstract
The double-radiative process e+e- -> Z gamma gamma -> q q~ gamma gamma, where the two hard photons escape detection at low polar angles into opposite directions, is studied in 0.62/fb of data collected with the L3 detector at LEP at centre-of-mass energies between 188.6GeV and 209.2GeV. The cross sections are measured and found to be consistent with the Standard Model expectations.
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