Measurement of Compton scattering at MAMI for the extraction of the electric and magnetic polarizabilities of the proton

Mornacchi, E. et al. (2022) Measurement of Compton scattering at MAMI for the extraction of the electric and magnetic polarizabilities of the proton. Physical Review Letters, 128(13), 132503. (doi: 10.1103/PhysRevLett.128.132503)

[img] Text
265979.pdf - Accepted Version

[img] Text
265979Suppl.pdf - Supplemental Material



A precise measurement of the differential cross sections d σ / d Ω and the linearly polarized photon beam asymmetry Σ 3 for Compton scattering on the proton below pion threshold has been performed with a tagged photon beam and almost 4 π detector at the Mainz Microtron. The incident photons were produced by the recently upgraded Glasgow-Mainz photon tagging facility and impinged on a cryogenic liquid hydrogen target, with the scattered photons detected in the Crystal Ball/TAPS setup. Using the highest statistics Compton scattering data ever measured on the proton along with two effective field theories (both covariant baryon and heavy-baryon) and one fixed- t dispersion relation model, constraining the fits with the Baldin sum rule, we have obtained the proton electric and magnetic polarizabilities with unprecedented precision: α E 1 = 10.99 ± 0.16 ± 0.47 ± 0.17 ± 0.34 , β M 1 = 3.14 ± 0.21 ± 0.24 ± 0.20 ± 0.35 ; in units of 10 − 4     fm 3 where the errors are statistical, systematic, spin polarizability dependent, and model dependent.

Item Type:Articles
Glasgow Author(s) Enlighten ID:MacGregor, Professor Douglas and Livingston, Dr Kenneth and Gardner, Mr Simon and Annand, Dr John and MULLEN, CHRISTOPHER and Glazier, Dr Derek and Powell, Ms Abby
Authors: Mornacchi, E., Martel, P. P., Abt, S., Achenbach, P., Adlarson, P., Afzal, F., Ahmed, Z., Annand, J. R. M., Arends, H. J., Bashkanov, M., Beck, R., Biroth, M., Borisov, N., Braghieri, A., Briscoe, W. J., Cividini, F., Collicott, C., Costanza, S., Denig, A., Dolzhikov, A. S., Downie, E. J., Drexler, P., Fegan, S., Gardner, S., Ghosal, D., Glazier, D. I., Gorodnov, I., Gradl, W., Günther, M., Gurevich, D., Heijkenskjöld, L., Hornidge, D., Huber, G. M., Käser, A., Kashevarov, V. L., Kay, S. J. D., Korolija, M., Krusche, B., Lazarev, A., Livingston, K., Lutterer, S., MacGregor, I. J. D., Manley, D. M., Miskimen, R., Mocanu, M., Mullen, C., Neganov, A., Neiser, A., Ostrick, M., Paudyal, D., Pedroni, P., Powell, A., Rostomyan, T., Sokhoyan, V., Spieker, K., Steffen, O., Strakovsky, I., Strub, T., Thiel, M., Thomas, A., Usov, Y. A., Wagner, S., Watts, D. P., Werthmüller, D., Wettig, J., Wolfes, M., and Zachariou, N.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN (Online):1079-7114
Copyright Holders:Copyright © 2022 American Physical Society
First Published:First published in Physical Review Letters 128(13): 132503
Publisher Policy:Reproduced in accordance with the publisher copyright policy

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
170610Glasgow nuclear physics consolidated grantDavid IrelandScience and Technology Facilities Council (STFC)ST/L005719/1P&S - Physics & Astronomy
301379Nuclear Physics Consolidated GrantDavid IrelandScience and Technology Facilities Council (STFC)ST/P004458/1P&S - Physics & Astronomy