Measurements of the generalized electric and magnetic polarizabilities of the proton at low Q2 using the virtual Compton scattering reaction

Bourgeois, P.; Sato, Y.; Shaw, J.; Alarcon, R.; Bernstein, A.; Bertozzi, W.; Botto, T.; Calarco, J.; Casagrande, F.; Distler, M.; Dow, K.; Farkondeh, M.; Georgakopoulos, S.; Gilad, S.; Hicks, R.; Holtrop, M.; Hotta, A.; Jiang, X.; Karabarbounis, A.; Kirkpatrick, J.; Kowalski, S.; Milner, R.; Miskimen, R.; Nakagawa, I.; Papanicolas, C.; Sarty, A.; Sirca, S.; Six, E.; Sparveris, N.; Stave, S.; Stiliaris, E.; Tamae, T.; Tsentalovich, G.; Tschalaer, C.; Turchinetz, W.; Zhou, Z.-L.; Zwart, T.

Author(s)

Bourgeois, P.; Sato, Y.; Shaw, J.; Alarcon, R.; Calarco, John R.; ... Show more

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Abstract

Experimental details of a virtual Compton scattering (VCS) experiment performed on the proton at the MIT-Bates out-of-plane scattering facility are presented. The VCS response functions P[scubscript LL]−P[scubscript TT]/P[scubscript TT]ɛɛ and P[scubscript LT] have been measured at Q[superscript 2]=0.057 GeV[superscript 2]/c[superscript 2]. The generalized electric and magnetic polarizabilities, α(Q[superscript 2]) and β(Q[superscript 2]), and the mean-square electric polarizability radius(r[subscript α][superscript 2]) are obtained from a dispersion analysis of the data. The results are in good agreement with O(p[superscript 3]) heavy baryon chiral perturbation and indicate the dominance of mesonic effects in the polarizabilities.

Date issued

2011-09

URI

http://hdl.handle.net/1721.1/68668

Department

Bates Linear Accelerator Center; Massachusetts Institute of Technology. Department of Brain and Cognitive Sciences; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science

Journal

Physical Review C

Publisher

American Physical Society (APS)

Citation

Bourgeois, P. et al. “Measurements of the generalized electric and magnetic polarizabilities of the proton at low Q^{2} using the virtual Compton scattering reaction.” Physical Review C 84.3 (2011): n. pag. Web. 26 Jan. 2012.

Version: Final published version

ISSN

0556-2813

1089-490X

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