A study of events with photons and missing energy has been performed with t
he data sample obtained with the ALEPH detector at centre-of-mass energies
from 161 to 184 GeV, corresponding to a total integrated luminosity of abou
t 80 pb(-1) The measured distributions are in agreement with Standard Model
predictions, leading to constraints on WW gamma gauge coupling parameters
Delta kappa(gamma) and lambda(gamma). The results from the fit to the cross
sections and to the energy and angular distributions of the photons are: D
elta kappa(gamma) = 0.05(-1.10)(+1.15)(stat) +/- 0.25(syst), lambda(gamma)
= -0.05(-1.45)(+1.55)(stat) +/- 0.30(syst). (C) 1998 Elsevier Science B.V.
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