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Question:
What are the different masses of quarks?


Replies:
Top - 175 GeV (maybe)
Bottom - 4.5 GeV
Charm - 1.5 GeV
Strange - between 100 MeV and 300 MeV
up - between 2 and 8 MeV
down - between 5 and 15 MeV

Since quarks cannot exist in isolation, the notion of "mass" is not very well defined.

Jack L. Uretsky


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