The Standard Model (SM) is the current model of the fundamental particles and their interactions. However, it has to be extended in order to include gravity, dark matter, unify all forces and be extendable to higher energies. Long lived charged particles are allowed by many models of physics beyond the SM. In general, different models have different characteristics.
However, long lived charged particles have a common characteristic in many models; if produced at the Large Hadron Collider some of them would travel with velocity significantly lower than the speed of light. Although the momentum (and therefore β) spectrum of those particles is model dependent, the common signal is a heavy longlived charged particle with velocity smaller than the speed of light, β<1. This unique signature makes the search for it model independent Our goal is to find a long lived charged particle, if it exists. Such a discovery would provide the first experimental evidence for physics beyond the SM. In absence of discovery, the interpretation of our results would be an exclusion of many theoretical extension of the SM.