Naturalness arguments imply the existence of higgsinos lighter than 200-300
GeV. However, because these higgsinos are nearly mass degenerate, they release
very little visible energy in their decays, and signals from electroweak
higgsino pair production typically remain buried under Standard Model
backgrounds. Moreover, gluinos, squarks and winos may plausibly lie beyond the
reach of the LHC14, so that signals from naturalness-inspired supersymmetric
models may well remain hidden via conventional searches. We examine instead
prospects for detecting higgsino pair production via monojets or mono-photons
from initial state radiation. We find typical signal-to-background rates at
best at the 1 % level, leading to rather pessimistic conclusions regarding
detectability via these channels.Comment: 10 pages plus 4 .eps figures; updated version to conform with
published versio
