Proton Compton Scattering from Linearly Polarized Gamma Rays

Abstract

Differential cross sections for Compton scattering from the proton have been measured at scattering angles of $55^{\circ }$, $90^{\circ }$, and $125^{\circ }$ in the laboratory frame using quasimonoenergetic linearly (circularly) polarized photon beams with a weighted mean energy value of 83.4\,MeV (81.3\,MeV). These measurements were performed at the High Intensity Gamma-Ray Source facility at the Triangle Universities Nuclear Laboratory. The results are compared to previous measurements and are interpreted in the chiral effective field theory framework to extract the electromagnetic dipole polarizabilities of the proton, which gives ${\alpha }_{E1}^p=13.8\pm 1.2_{\mathrm{stat}}\pm 0.1_{\mathrm{BSR}}\pm 0.3_{\mathrm{theo}},{\beta }_{M1}^p=0.2\mp 1.2_{\mathrm{stat}}\pm 0.1_{\mathrm{BSR}}\mp 0.3_{\mathrm{theo}}$ in units of 10${}^{-4}$\, fm${}^3$.

6 pages, 4 figures. Version identical to the published letter

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Cited by in corpus (3)

• The Present and Future of QCD
• First concurrent extraction of the leading-order scalar and spin proton polarizabilities
• The Proton Electromagnetic Generalized Polarizabilities