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

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

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...

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Bibliographic Details
Main Authors: Bourgeois, P., Sato, Y., Shaw, J., Alarcon, R., Calarco, John R., Distler, M. O., Georgakopoulos, S., Hicks, R., Holtrop, M., Hotta, A., Jiang, X., Karabarbounis, A., Kirkpatrick, J., Miskimen, R., Papanicolas, C. N., Sarty, A. J., Six, E., Sparveris, N. F., Stiliaris, E., Tamae, T., Bernstein, Aron M., Bertozzi, William, Botto, Tancredi, Casagrande, F., Dow, Karen A., Farkhondeh, Manouchehr, Gilad, Shalev, Kowalski, Stanley B., Milner, Richard G., Nakagawa, I., Sirca, Simon, Stave, Elise A., Tsentalovich, Evgeni P., Tschalaer, Christoph, Turchinetz, William E., Zhou, Z. -L., Zwart, T.
Other Authors: Bates Linear Accelerator Center
Format: Article
Language:en_US
Published: American Physical Society (APS) 2012
Online Access:http://hdl.handle.net/1721.1/68668
https://orcid.org/0000-0003-3088-6060
https://orcid.org/0000-0002-0031-1963
https://orcid.org/0000-0003-2713-7800
https://orcid.org/0000-0002-5665-3081
https://orcid.org/0000-0002-6337-331X
Description
Summary: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.

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