Z-boson production with two unobserved, back-to-back, hard photons at LEP

University of Hamburg, Hamburg, Hamburg, Germany
Physics Letters B (Impact Factor: 6.13). 05/2005; 613(3). DOI: 10.1016/j.physletb.2005.03.039
Source: OAI

ABSTRACT

The double-radiative process e(+)e(-) → Zγγ → 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.

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