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In Supersymmetry (SUSY) theory, which introduces a new symmetry between fundamental particles,
Gauge-Mediated SUSY Breaking models (with gauge interactions communicating the symmetry breaking)
can produce events which decay down to the lightest neutralino into the photon and gravitino,
the SUSY partner of the graviton, where gravitino is the lightest supersymmetric particle (LSP).
GMSB can produce a final state of two photons and large unbalanced (missing) transverse energy MET.
MET is often used as a pointer to possible SUSY signals
because it could indicate the escape of a non-interacting SUSY particle (like LSP) from the particle detector.
The LSP signals are of particular interest, as they provide a natural explanation for the "Dark Matter",
known to pervade our universe, and help us to understand the fundamental connection
between particle physics and cosmology.
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