Gell-Mann - Relationship for quantum numbers?

Question

Hey

Given that the Gell-Mann relationship is

Q = (B+S+C+B*+ T) / 2 + I3

(where B* is the bottom quantum number)

If we have an up quark with I3= 1/2, a charm quark with C = +1 and a top quark with T = +1 and all other quantum numbers are zero, what would be the charge Q? I would think it would be +3/2, however, my lecture notes say differently giving an answer of +2/3. I cannot understand how this is so. Could anyome fill me in?

Thanks!

Answer 1

You lecture notes have an error in them, it's actuall +3/2.1