M. Acciarri et al., Single and multi-photon events with missing energy in e(+)e(-) collisions at root s = 183 GeV, PHYS LETT B, 444(3-4), 1998, pp. 503-515
An analysis of single and multi-photon events with missing energy is perfor
med using data collected with the L3 detector at LEP at centre-of-mass ener
gies around 183 GeV, for a total of 55.3 pb(-1) of integrated luminosity. T
he results obtained are in good agreement with the Standard Model predictio
n and are used to derive the value for the e(+)e(-) --> v (v) over bar gamm
a(gamma) cross section as well as upper limits on ness sections of new phys
ics processes. Several interpretations in supersymmetric models providing n
ew limits on the masses of the lightest neutralino and of the gravitino are
presented. (C) 1998 Elsevier Science B.V. All rights reserved.