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

The double-radiative process e+e−→Zγγ→qq¯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.

electron positron: colliding beams
electron positron: annihilation
photon: pair production
radiation: initial-state interaction
production: small-angle
Z0: associated production
Z0: hadronic decay
channel cross section: energy dependence
electroweak interaction: validity test
L3

References(33)

Figures(12)

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,
B.F.L. Ward
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Z. Was
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