Single- and multi-photon events with missing energy in e+e− collisions at LEP

Missing energy
DOI: 10.1016/j.physletb.2004.01.010 Publication Date: 2004-03-24T10:15:30Z
AUTHORS (361)
ABSTRACT
Single- and multi-photon events with missing energy are selected in 619/pb of data collected by the L3 detector at LEP centre-of-mass energies between 189GeV 209GeV. The cross sections process e^+e^- -> nu gamma (gamma) found to be agreement Standard Model expectations, number light neutrino species is determined, including lower data, N_nu = 2.98 +/- 0.05 0.04. Selection results also given form tables which can used test future models involving single- signatures LEP. These final states predicted large extra dimensions several supersymmetric models. No evidence for such found. Among others, limits 1.5TeV 0.65TeV set, 95% confidence level, on new scale gravity 2 6.
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