2021/10/29 by E. Mornacchi, A2 Collaboration, P. P. Martel +132
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Atomic and Subatomic Physics Research #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Physics and Applications #Nuclear Theory (nucl-th)
paper · pdf · doi:10.48550/arxiv.2110.15691
openalex publication_date 2021/10/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A precise measurement of the differential cross-sections dσ/dΩ and the linearly polarized photon beam asymmetry Σ3 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 set-up. 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: amp;αE1 = 10.99 ± 0.16 ± 0.47 ± 0.17 ± 0.34 amp;βM1 = 3.14 ± 0.21 ± 0.24 ± 0.20 ± 0.35 in units of 10-4 fm3 where the errors are statistical, systematic, spin polarizability dependent and model dependent.