Photon events with missing energy at $\sqrt{s} =$ 183 to 189 GeV

The production of single photons has been studiedin 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-photonfinal states accompanied by missing energy has been updated with 189 GeV data.The data...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2000-10, Vol.17 (1), p.53-65
Main Author: Abreu et al, P.
Format: Article
Language:English
Subjects:
High Energy Physics - Experiment
Physics
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Summary:The production of single photons has been studiedin 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-photonfinal states accompanied by missing energy has been updated with 189 GeV data.The data were collected with the DELPHI detector and correspondto integrated luminosities of about 51~pb^{-1}and 158~pb^{-1}at thetwo energies.The number of light neutrino families is measured to be2.86\pm0.13(stat)\pm0.14(syst)$. The absence ofan excess of events beyond that expected from Standard Modelprocesses is used to set limits on new physicsas described by supersymmetric and composite models.A limit on the gravitational scale is also determined.
ISSN:1434-6044
1434-6052
DOI:10.1007/s100520000434