i guess that answers my question where i was about to go
*Just to be sure : you are not talking an extra spatial or temporal dimension, it's something closer to an 'ethereal' (ghost)world floating in the same space and time as the one we CAN perceive * ? question mark ... so yes and the signal would be a hole in the data ? like abscense ?
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I indeed do not talk bout extra dimensions (which is en entirely other topic). In this post, I consider our good old four-dimensional space-time. There are just two classes of particles in there, and interactions between classes are extremely feeble.
The signal to observe would here be only this feeble interaction happening in a detector.
Does it clarify?