Measurement of Compton Scattering at MAMI for the Extraction of the Electric and Magnetic Polarizabilities of the Proton

(A2 Collaboration MAMI) Mornacchi, E; Martel, PP; Abt, S; Achenbach, P; Adlarson, P; Afzal, F; Ahmed, Z; Annand, JRM; Arends, HJ; Bashkanov, M; Beck, R; Biroth, M; Borisov, N; Braghieri, A; Briscoe, WJ; Cividini, F; Collicott, C; Costanza, S; Denig, A; Dolzhikov, AS; Downie, EJ; Drexler, P; Fegan, S; Gardner, S; Ghosal, D; Glazier, D; Gorodnov, ; Gradl, W; Günther, M; Gurevich, D; Heijkenskjöld, L; Hornidge, D; Huber, GM; Käser, A; Kashevarov, VL; Kay, SJD; Korolija, M; Krusche, B; Lazarev, A; Livingston, K; Lutterer, S; MacGregor, IJD; Manley, DM; Miskimen, R; Mocanu, M; Mullen, C; Neganov, A; Neiser, A; Ostrick, M; Paudyal, D; Pedroni, P; Powell, A; Rostomyan, T; Sokhoyan, ; Spieker, K; Steffen, O; Strakovsky, ; Strub, T; Thiel, M; Thomas, A; Usov, YA; Wagner, S; Watts, DP; Werthmüller, D; Wettig, J; Wolfes, M; Zachariou, N (2022) Measurement of Compton Scattering at MAMI for the Extraction of the Electric and Magnetic Polarizabilities of the Proton. Physical Review Letters, 128 (13). ISSN 0031-9007

PDF - Submitted Version - article Download (395kB)

Abstract

A precise measurement of the differential cross sections d sigma/d Omega and the linearly polarized photon beam asymmetry Sigma(3) for Compton scattering on the proton below pion threshold has been performed with a tagged photon beam and almost 4 pi 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: alpha(E1) = 10.99 +/- 0.16 +/- 0.47 +/- 0.17 +/- 0.34, beta(M1) = 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:	Article
Uncontrolled Keywords:	low-energy photons; polarized photons; hydrogen; nucleon; microtron; system; light; mainz
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type The strong interaction at the frontier of knowledge: fundamental research and applications-STRONG-2020 Milorad Korolija; Damir Bosnar; Krešimir Kumerički; Kornelija Passek-Kumerički 824093 EK
Depositing User:	Ema Buhin Šaler
Date Deposited:	15 May 2026 08:07
URI:	https://fulir.irb.hr:/id/eprint/11952
DOI:	10.1103/PhysRevLett.128.132503

Actions (login required)

View Item