Probing Hadronic Structure with The Decay Δ→ Nl+l-
Malcolm N. Butler, Martin J. Savage, Roxanne P. Springer
Abstract
We compute the branching ratio for Δ→ Ne+e- and Δ→ Nμ+μ- in chiral perturbation theory and find that both decays should be observable at CEBAF. With sufficiently low thresholds on the e+e- invariant mass a branching ratio of 10-5 may be observed for Δ→ Ne+e-. For the Δ→ Nμ+μ- decay mode we predict a branching ratio of 3× 10-7. The dependence of the M1 and E2 amplitudes on the momentum transfer will provide a useful test of chiral perturbation theory which predicts 20\% variation over the allowed kinematic range.
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