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RE: Probing long-lived particles at the LHC with AL3X
My first time of hearing about long-lived particles in details.
I want to ask; what's the minimum distance a particle would have to travel from the point of production (without undergoing a reaction) for it to be qualified as a long-lived particle?
In general, new particle lifetimes are so small than the decay looks instantaneous from the detector standpoint. Any particle whose decay would be recorded as a displaced decay (compared to the primary collision point) can thus considered as long-lived.
Typically, from the LHC standards, we consider particles flying over distances ranging from millimeters to a couple of dozens of meters. Of course, long-lived particles could even be more long-lived ("stable" is the maximum).