Measurements of the generalized electric and magnetic polarizabilities of the proton at low Q2 using the virtual-compton-scattering reaction.
/ Authors
P. Bourgeois, Y. Sato, J. Shaw, R. Alarcon, J. Calarco, M. Distler, S. Georgakopoulos, R. Hicks, M. Holtrop, A. Hotta
and 27 more authors
X. Jiang, A. Karabarbounis, J. Kirkpatrick, R. Miskimen, C. Papanicolas, A. Sarty, E. Six, N. Sparveris, E. Stiliaris, T. Tamae, A. Bernstein, W. Bertozzi, T. Botto, F. Casagrande, K. Dow, M. Farkhondeh, S. Gilad, S. Kowalski, R. Milner, I. Nakagawa, S. Širca, Elise A. Stave, E. Tsentalovich, C. Tschalaer, W. Turchinetz, Z. Zhou, T. Zwart
/ Abstract
The mean square polarizability radii of the proton have been measured for the first time in a virtual-Compton-scattering experiment performed at the MIT-Bates out-of-plane scattering facility. Response functions and polarizabilities obtained from a dispersion analysis of the data at Q2 = 0.057 GeV2/c2 are in agreement with O(p3) heavy baryon chiral perturbation theory. The data support the dominance of mesonic effects in the polarizabilities.
Journal: Physical review letters