By the same authors

From the same journal

From the same journal

Extracting the spin polarizabilities of the proton by measurement of Compton double-polarization observables

Research output: Contribution to journalArticle

Full text download(s)

Published copy (DOI)


  • A2 Collaboration


Publication details

JournalPhysical Review C
DateAccepted/In press - 11 Aug 2020
DatePublished (current) - 25 Sep 2020
Issue number3
Original languageEnglish


The Compton double-polarization observable ς2z has been measured for the first time in the Δ(1232) resonance region using a circularly polarized photon beam incident on a longitudinally polarized proton target at the Mainz Microtron. This paper reports these results, together with the model-dependent extraction of four proton spin polarizabilities from fits to additional asymmetry data using either a dispersion relation calculation or a baryon chiral perturbation theory calculations with the weighted average of these two fits resulting in γE1E1=-2.87±0.52, γM1M1=2.70±0.43, γE1M2=-0.85±0.72, and γM1E2=2.04±0.43, in units of 10-4fm4.

Bibliographical note

© 2020, The Author(s).

Discover related content

Find related publications, people, projects, datasets and more using interactive charts.

View graph of relations