Suppose there were a kind of “neutrinolet” that was massless, had no color charge or electrical charge, and did not feel the weak force. Could you say that this particle even exists?

Suppose there were a kind of “neutrinolet” that was massless, had no color charge or electrical…

 

Suppose there were a kind of “neutrinolet” that was massless, had no color charge or electrical charge, and did not feel the weak force. Could you say that this particle even exists?

Using the ideas of quantum chromodynamics, would it be possible to find particles made up of two quarks and no antiquarks? What about two quarks and two antiquarks?

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If gravity is the weakest force, why is it the one we notice most? (a) Our bodies are not sensitive to the other forces. (b) The other forces act only within atoms and therefore have no effect on us. (c) Gravity may be “very weak” but always attractive, and the Earth has enormous mass. The strong and weak nuclear forces have very short range. The electromagnetic force has a long range, but most matter is electrically neutral. (d) At long distances, the gravitational force is actually stronger than the other forces. (e) The other forces act only on elementary particles, not on objects our size.