Measurements of the generalized electric and magnetic polarizabilities of the proton at low Q(2) using the virtual Compton scattering reaction

作者：Bourgeois P^*; Sato Y; Shaw J; Alarcon R; Bernstein A M; Bertozzi W; Botto T; Calarco J; Casagrande F; Distler M O; 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 N; Sarty A J; Sirca S; Six E; Sparveris N F; Stave S; Stiliaris E; Tamae T; Tsentalovich G; Tschalaer C; Turchinetz W; Zhou Z L

来源：Physical Review C, 2011, 84(3): 035206.

DOI：10.1103/PhysRevC.84.035206

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-LL - P-TT/epsilon and P-LT have been measured at Q(2) = 0.057 GeV2/c(2). The generalized electric and magnetic polarizabilities, alpha(Q(2)) and beta(Q(2)), and the mean-square electric polarizability radius < r(alpha)(2)> are obtained from a dispersion analysis of the data. The results are in good agreement with O(p(3)) heavy baryon chiral perturbation and indicate the dominance of mesonic effects in the polarizabilities.

• 出版日期2011-9-29
• 单位MIT; Los Alamos