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Single and Multi-Photon Events with Missing Energy in e+e- Collisions at \sqrt{s} = 189 GeV

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arxiv hep-ex/9910009 v1 pith:AVOM66X6 submitted 1999-10-02 hep-ex

L3 Collaboration This is my paper · ORCID
classification hep-ex
keywords energylimitscrossdatadimensionseventsextragamma
verification ladder T0 review T1 audit T2 compute T3 formal

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Single and multi-photon events with missing energy are analysed using data collected with the L3 detector at LEP at a centre-of-mass energy of 189 GeV, for a total of 176 pb^{-1} of integrated luminosity. The cross section of the process e+e- -> nu nu gamma (gamma) is measured and the number of light neutrino flavours is determined to be N_\nu = 3.011 +/- 0.077 including lower energy data. Upper limits on cross sections of supersymmetric processes are set and interpretations in supersymmetric models provide improved limits on the masses of the lightest neutralino and the gravitino. Graviton-photon production in low scale gravity models with extra dimensions is searched for and limits on the energy scale of the model are set exceeding 1 TeV for two extra dimensions.

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Cited by 3 Pith papers

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    Future e+e- colliders can probe the axion-photon-dark photon coupling down to about 10^-4 GeV^-1 for dark photon masses near 10 GeV via single-photon events with missing energy.

  3. The Dark Photon

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    The paper surveys theoretical motivations, experimental searches, and bounds on the dark photon as a kinetically mixed gauge boson from a dark sector, covering both massive and massless cases along with related milli-...

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