One mile beneath a mountain in Italy, scientists at the Gran Sasso National Laboratory fill a particle detector with liquid xenon, hoping to observe evidence of dark matter. The idea is that ...

Päs has been a visiting scientist at the Gran Sasso Laboratory in Assergi/Italy, the ICTP Trieste, CERN Theory Division, Fermilab Theory Group, the Aspen Center of Physics and the KITP in Santa ...