Affiliation:
1. Institute of Accelerating Systems and Applications and Department of Physics, University of Athens, Greece
Abstract
The issue of hadron deformation has been a subject of intense scientific interest during the last two decades. The detailed study of the N→Δ transition is the best method of experimental investigation of this issue. A brief overview of the experimental and theoretical landscape on the field will be presented followd by a presentation of the most recent results from the Bates N→Δ program. The Bates data yield precise quadrupole to dipole amplitude ratios: EMR=(-2.3±0.3stat+sys±0.6model)% and CMR=(-6.1±0.2stat+sys±0.5model)% for [Formula: see text]. The derived amplitudes give credence to the conjecture of deformation in hadrons favoring, at low Q2, the dominance of mesonic effects.
Publisher
World Scientific Pub Co Pte Lt
Subject
Astronomy and Astrophysics,Nuclear and High Energy Physics,Atomic and Molecular Physics, and Optics