Z-boson production with two unobserved, back-to-back, hard photons at LEP
Physics Letters B 613,3-4 (2005) 118-127;
The double-radiative process e(+)e(-) &RARR; Zγγ &RARR; q $(q) over bar $ γγ where the two hard photons escape detection at low polar angles into opposite directions, is studied in 0.62 fb(-1) of data collected with the L3 detector at LEP at centre-of-mass energies between 188.6 and 209.2 GeV. The cross sections are measured and found to be consistent with the Standard Model expectations. © 2005 Published by Elsevier B.V.
fermion-pair production;; physics event generation;; monte-carlo;; e(+)e(-) collisions;; cross-sections;; muon detector;; l3 experiment;; couplings;; energies;; construction
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