The production of invisible pairs of lightest neutralinos accompanied by a
large-angle hard photon in the reaction e+e−→χ10​χ10​γ
is studied at LEP2 energies. The most general gaugino/higgsino composition of
the χ10​ within the Minimal Supersymmetric Standard Model is assumed. The
spectrum of the observed photon is derived within the framework of the
pt​-dependent structure-function approach, whose accuracy is assessed to be
within the foreseen experimental accuracy at LEP2. Higher-order QED corrections
due to undetected initial-state radiation are also included. A comparison with
the Standard Model main background from e+e−→ννˉγ is
performed for optimized photon kinematical cuts. Quantitative conclusions on
the signal/background ratio are given for a wide range of values of the SUSY
parameters.Comment: 19 pages, 6 figures, uuencoded gzipped postscript file. Revised
(->shortened) version. To be published in Nuclear Physics