> Dear Dr. Steve, > > I hit a small snag while working problem 3 e) of the assignment. I'm > trying to tell if I is conserved, but I cannot find in a table what the > value for I of Ds+* is. It is listed for Ds+ as 0, but I cannont assume > this is true for Ds+* also because the dacay that is listed in the table > in the back of F&H is Ds+* -> Ds+ + gamma which is EM, which does not > conserve I. Would it help if I understood the meaning of the *? > > I'd appreciate any clarification that you would find acceptable. > > Thanks, > It is true for Ds+* too that I=0. The "*" in Ds+* just means it's some (radial or spin) excitation of a Ds+, so the quark constituents don't change. (All Ds+'s are "Charmed-strange", so have no ups or downs in them. So, they all have isospin 0! (Only ups and downs carry strong isospin) Does that help? Cheers, Steve
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