Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-12-26
Published in the proceedings, "Phenomenology of Large Nc QCD," edited by Richard F. Lebed (World Scientific, Singapore, 2002)
Physics
High Energy Physics
High Energy Physics - Phenomenology
Invited talk at the workshop on The Phenomenology of Large Nc QCD, held at Arizona State University, Tempe, AZ, USA, 9-11 Janu
Scientific paper
We consider decays of the lowest-lying positive parity 56-plet and negative parity bf 70-plet excited baryons. For the 70-plet, we include both single-quark and two-quark decay operators, and find, somewhat mysteriously, that the two-quark operators are not phenomenologically important. Studies of decays 70-plet to Delta(1232) + photon may strengthen or vitiate this observation. For the 56-plet decays, now using only the single-quark operator, we can predict many strong decays after fitting parameters on the assumption that the Roper is a 3q state. Comparison of these predictions to experiment can verify the structure of the 56-plet. As a sidelight, we show a large N_c derivation of the old Gursey-Radicati mass formula.
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