Photon events with missing energy at √s = 183 to 189 GeV
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Photon events with missing energy at √s = 183 to 189 GeV

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Photon events with missing energy at √s = 183 to 189 GeV

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DELPHI Collaboration; Alemany Fernández, Reyes; Cabrera Urbán, Susana Perfil; Castillo Giménez, María Victoria Perfil; Cortina Gil, Eduardo; Ferrer Soria, Antonio Perfil; Fuster Verdú, Juan A. Perfil; García García, Carmen Perfil; Gil Botella, Inés; Hernández Rey, Juan José Perfil; Higón Rodríguez, Emilio Perfil; Martínez Vidal, Fernando Perfil; Navas Concha, Sergio; Salt Cairols, José Perfil; Tortosa Martínez, Pablo
Aquest document és un/a article, creat/da en: 2000

Este documento está disponible también en : http://dx.doi.org/10.1007/s100520000434
The production of single photons has been studied in the reaction e+e- -> gamma + invisible particles at centre-of-mass energies of 183 GeV and 189 GeV. A previously published analysis of events with multi-photon final states accompanied by missing energy has been updated with 189 GeV data. The data were collected with the DELPHI detector and correspond to integrated luminosities of about 51 pb^{-1} and 158 pb^{-1} at the two energies. The number of light neutrino families is measured to be 2.84 +/- 0.15(stat) +/- 0.14(syst). The absence of an excess of events beyond that expected from Standard Model processes is used to set limits on new physics as described by supersymmetric and composite models. A limit on the gravitational scale is also determined.

    DELPHI Collaboration Alemany, R. Cabrera Urbán, Susana Castillo Giménez, María Victoria Cortina, E. Ferrer Soria, Antonio Fuster Verdú, Juan A. García García, Carmen Gil, I. Hernández Rey, Juan José Higón Rodríguez, Emilio Martínez Vidal, Fernando Navas, S. Salt Cairols, José ,Tortosa Martínez, Pablo, 2000 Photon events with missing energy at √s = 183 to 189 GeV European Physical Journal C 17 1 53 65
http://dx.doi.org/10.1007/s100520000434
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