Journal article
Single and multi-photon events with missing energy in e+e−collisions at s= 189 GeV
Abstract
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 of integrated luminosity. The cross section of the process e+e− → νν̄γ(γ) is measured and the number of light neutrino flavours is determined to be Nν=3.011±0.077 including lower energy data. Upper limits on cross sections of supersymmetric processes are set and …
Authors
Collaboration L; Acciarri M; Achard P; Adriani O; Aguilar-Benitez M; Alcaraz J; Alemanni G; Allaby J; Aloisio A; Alviggi MG
Journal
Physics Letters B, Vol. 470, No. 1-4, pp. 268–280
Publisher
Elsevier
Publication Date
12 1999
DOI
10.1016/s0370-2693(99)01286-1
ISSN
0370-2693