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. PywellM. 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

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

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 αE1p=13.8±1.2stat±0.1BSR±0.3theo,βM1p=0.21.2stat±0.1BSR0.3theo in units of 10-4 fm3.

Original languageEnglish
Article number132502
JournalPhysical Review Letters
Volume128
Issue number13
DOIs
StatePublished - Apr 1 2022

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.

Funding

We acknowledge the support of the HIGS accelerator staff for the delivery of high-quality gamma-ray beams and the help with the experimental setup. We acknowledge the contributions of Daniel Phillips to this work. This work is funded in part by the U.S. Department of Energy under Contracts No. DE-FG02-03ER41231, No. DE-FG02-97ER41033, No. DE-FG02-97ER41041, No. DE-FG02-97ER41046, No. DE-FG02-97ER41042, No. DE-SC0005367, No. DE-SC0015393, No. DE-SC0016581, and No. DE-SC0016656, National Science Foundation Grants No. NSF-PHY-0619183, No. NSF-PHY-1309130, and No. NSF-PHY-1714833, UK Science and Technology Facilities Council Grants No. ST/L005794/1 and No. ST/P004423/1, and funds from the Dean of the Columbian College of Arts and Sciences at The George Washington University, and its vice president for research. We acknowledge the financial support of the Natural Sciences and Engineering Research Council of Canada and the support of Eugen Merzbacher Fellowship.

FundersFunder number
Columbian College of Arts and Sciences
Natural Sciences and Engineering Research Council of Canada
UK Industrial Decarbonization Research and Innovation Centre
Science and Technology Facilities CouncilST/P004423/1, ST/L005794/1
Science and Technology Facilities Council
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China1714833, NSF-PHY-0619183, NSF-PHY-1309130
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China
U.S. Department of Energy Oak Ridge National Laboratory U.S. Department of Energy National Science Foundation National Energy Research Scientific Computing CenterDE-FG02-97ER41046, DE-FG02-97ER41042, DE-FG02-03ER41231, DE-SC0016581, DE-FG02-97ER41033, DE-SC0015393, DE-FG02-97ER41041, DE-SC0016656, DE-SC0005367
U.S. Department of Energy Oak Ridge National Laboratory U.S. Department of Energy National Science Foundation National Energy Research Scientific Computing Center

    ASJC Scopus subject areas

    • General Physics and Astronomy

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