HAL : in2p3-00000205, version 1
 Physics Letters B 413 (1997) 159-166
 Hard-photon production at $\sqrt{s}$ = 161 and 172 GeV at LEP.
 L3 Collaboration(s)
 (1997)
 We have studied the process $e^+e^-{\rightarrow}\rm n {\gamma}$ $(\rm n{\ge}2)$ at centre-of-mass energies of 161.3 GeV and 172.1 GeV. The analysis is based on a sample of events collected by the L3 detector in 1996 corresponding to total integrated luminosities of 10.7 ${\rm pb^{-1}}$ and 10.1 ${\rm pb^{-1}}$ respectively. The observed rates of events with two and more photons and the characteristic distributions are in good agreement with the Standard Model expectations. This is used to set lower limits on contact interaction energy scale parameters, on the QED cut-off parameters and on the mass of excited electrons.
 équipe(s) de recherche : CMS
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
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 in2p3-00000205, version 1 http://hal.in2p3.fr/in2p3-00000205 oai:hal.in2p3.fr:in2p3-00000205 Contributeur : Sylvie Florès <> Soumis le : Mardi 3 Novembre 1998, 11:17:57 Dernière modification le : Jeudi 21 Avril 2005, 14:21:46