Rare Particle Searches with the high altitude SLIM experiment
  The search for rare particles in the cosmic radiation remains one of the main aims of non-accelerator particle astrophysics. Experiments at high altitude allow lower mass thresholds with respect to detectors at sea level or underground. The SLIM experiment is a large array of nuclear track detectors located at the Chacaltaya High Altitude Laboratory (5290 m a.s.l.). The preliminary results from the analysis of a part of the first 236 sq.m exposed for more than 3.6 y are here reported. The detector is sensitive to Intermediate Mass Magnetic Monopoles and to SQM nuggets and Q-balls, which are possible Dark Matter candidates. 
S. Balestra, S. Cecchini, F. Fabbri, G. Giacomelli, R. Giacomelli, M.   Giorgini, A. Kumar, S. Manzoor, J. McDonald, A. Marg...