Proton Compton Scattering from Linearly Polarized Gamma Rays

X Li; M W Ahmed; A Banu; C Bartram; B Crowe; E J Downie; M Emamian; G Feldman; H Gao; D Godagama; H W Grießhammer; C R Howell; H J Karwowski; D P Kendellen; M A Kovash; K K H Leung; D M Markoff; J A McGovern; S Mikhailov; R E Pywell; M H Sikora; J A Silano; R S Sosa; M C Spraker; G Swift; P Wallace; H R Weller; C S Whisnant; Y K Wu; Z W Zhao

doi:10.1103/PhysRevLett.128.132502

Proton Compton Scattering from Linearly Polarized Gamma Rays

Phys Rev Lett. 2022 Apr 1;128(13):132502. doi: 10.1103/PhysRevLett.128.132502.

Authors

X Li^{1

2}, M W Ahmed^{2

3}, A Banu⁴, C Bartram^{2

5}, B Crowe^{2

3}, E J Downie⁶, M Emamian², G Feldman⁶, H Gao^{1

2}, D Godagama⁷, H W Grießhammer^{1

6}, C R Howell^{1

2}, H J Karwowski^{2

5}, D P Kendellen^{1

2}, M A Kovash⁷, K K H Leung^{1

2

8}, D M Markoff^{2

3}, J A McGovern⁹, S Mikhailov², R E Pywell¹⁰, M H Sikora^{2

6}, J A Silano^{2

5}, R S Sosa³, M C Spraker¹¹, G Swift², P Wallace², H R Weller^{1

2}, C S Whisnant⁴, Y K Wu^{1

2}, Z W Zhao^{1

2}

Affiliations

¹ Department of Physics, Duke University, Durham, North Carolina 27708-0308, USA.
² Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA.
³ Department of Mathematics and Physics, North Carolina Central University, Durham, North Carolina, 27707, USA.
⁴ Department of Physics and Astronomy, James Madison University, Harrisonburg, Virginia 22807, USA.
⁵ University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27516, USA.
⁶ Institute for Nuclear Studies, Department of Physics, The George Washington University, Washington, D.C. 20052, USA.
⁷ Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA.
⁸ Department of Physics and Astronomy, Montclair State University, Montclair, New Jersey 07043, USA.
⁹ Theoretical Physics Group, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom.
¹⁰ Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E2, Canada.
¹¹ Department of Physics and Astronomy, University of North Georgia, Dahlonega, Georgia 30597, USA.

PMID: 35426711
DOI: 10.1103/PhysRevLett.128.132502

Abstract

Differential cross sections for Compton scattering from the proton have been measured at scattering angles of 55°, 90°, and 125° 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 α_{E1}^{p}=13.8±1.2_{stat}±0.1_{BSR}±0.3_{theo},β_{M1}^{p}=0.2∓1.2_{stat}±0.1_{BSR}∓0.3_{theo} in units of 10^{-4} fm^{3}.