Stable massive particles
In Collider Experiments
Heavy, exotic particles interacting with matter and which can be directly detected through collider experiments are termed as Stable massive particles or SMPs. More specifically an SMP is defined to be a particle which can pass through a detector without decaying and can undergo electromagnetic or strong interaction with matter. Searches for SMPs have been carried out across spectrum of collision experiments such as lepton-hadron, hadron-hadron and electron-positron. Although none of this experiments have detected an SMP, they have put substantial constraints on the nature of SMPs.
In Non-Collider EXperimets
In case of the non-collider experiments SMPs are defined as sufficiently long lived particles which exists either as relics of the big bang singularity or are the products of secondary collisions. and are beyond the range of any conceivable accelerator experiment.
If the SMPs are ever discovered, several questions related to the origin and constituent of dark matter and about the unification of four fundamental forces would be answered.
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