Physical Sciences and Mathematics Commons^™

Electroexcitation Of The Δ+ (1232) At Low Momentum Transfer, A. Blomberg, D. Anez, N. Sparveris, A. J. Sarty, M. Paolone, S. Gilad, D. Higinbotham, Z. Ahmed, H. Albataineh, K. Allada

Physics Faculty Publications

We report on new p(e, e' p)π°. measurements at the Δ⁺(1232) resonance at the low momentum transfer region, where the mesonic cloud dynamics is predicted to be dominant and rapidly changing, offering a test bed for chiral effective field theory calculations. The new data explore the Q² dependence of the resonant quadrupole amplitudes and for the first time indicate that the Electric and the Coulomb quadrupole amplitudes converge as Q² -> 0. The measurements of the Coulomb quadrupole amplitude have been extended to the lowest momentum transfer ever reached, and suggest that more than half of …