Crossword Genius

Ones colliding in the Large Hadron Collider (4)

Ross

I believe the answer is:

ions

(Other definitions for ions that I've seen before include "Electrically-charged particles" , "Charged atom or molecule" , "Electrically charged particles" , "items with a charge" , "N in radio comms." .)

I've seen this clue in The New York Times.
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