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. 2022 Apr 1;128(13):132503.
doi: 10.1103/PhysRevLett.128.132503.

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

E Mornacchi  1 , P P Martel  1   2 , S Abt  3 , P Achenbach  1 , P Adlarson  1 , F Afzal  4 , Z Ahmed  5 , J R M Annand  6 , H J Arends  1 , M Bashkanov  7 , R Beck  4 , M Biroth  1 , N Borisov  8 , A Braghieri  9 , W J Briscoe  10 , F Cividini  1 , C Collicott  1 , S Costanza  9 , A Denig  1 , A S Dolzhikov  8 , E J Downie  10 , P Drexler  1 , S Fegan  7 , S Gardner  6 , D Ghosal  3 , D I Glazier  6 , I Gorodnov  8 , W Gradl  1 , M Günther  3 , D Gurevich  11 , L Heijkenskjöld  1 , D Hornidge  2 , G M Huber  5 , A Käser  3 , V L Kashevarov  1   8 , S J D Kay  5 , M Korolija  12 , B Krusche  3 , A Lazarev  8 , K Livingston  6 , S Lutterer  3 , I J D MacGregor  6 , D M Manley  13 , R Miskimen  14 , M Mocanu  7 , C Mullen  6 , A Neganov  8 , A Neiser  1 , M Ostrick  1 , D Paudyal  5 , P Pedroni  9 , A Powell  6 , T Rostomyan  3 , V Sokhoyan  1 , K Spieker  4 , O Steffen  1 , I Strakovsky  10 , T Strub  3 , M Thiel  1 , A Thomas  1 , Yu A Usov  8 , S Wagner  1 , D P Watts  7 , D Werthmüller  7 , J Wettig  1 , M Wolfes  1 , N Zachariou  7 ; A2 Collaboration at MAMI
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Free article

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

E Mornacchi et al. Phys Rev Lett. .
Free article

Abstract

A precise measurement of the differential cross sections dσ/dΩ 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 4π 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_{E1}=10.99±0.16±0.47±0.17±0.34, β_{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.

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