A search for single and multi-photon events with missing energy is performed using data collected at centre-of-mass energies between 161 GeV and 172 GeV for a total of 20.9 pb−1 of integrated luminosity. The results obtained are used to derive the value for the ννγ(γ) cross section as well as upper limits on new physics processes.
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Acciarri et al. (1997) studied this question.
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