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If they are hypothetical...I wonder why do they spend so much of fund with so much confidence

This can be explained as such:

  • We have strong evidence that the Standard Model is not the ultimate theory of nature. There must thus be something else.
  • We are actively searching for this something else.
  • We have no clue on the form of this something else, so that all options are considered.
  • We must be sure that all options could be found with the current experimental program.

Dark sectors are one of the options of new phenomena, and it turns out that they may escape detection with the current experiments. Therefore, we must think how to improve the situation. FASER is one option among others.

Note that at this stage, not a single cent has been spent as we are talking about a proposal for an experiment.

And finally, no one is confident we will find anything. We are talking about being sure not to miss anything, if the anything is within our reach.

I hope I was clearer :)

Yeah...fairly enough.Thank you for it

Good post , I do believe dark particle is the biggest mysteries in the universe. It’s thought to be an invisible substance that makes up roughly five-sixths of all matter in the cosmos !!

You are missing the "maybe". There are actually alternative theories that work as well :)

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