Measurement of Compton scattering at MAMI for the extraction of the electric and magnetic polarizabilities of the proton
- Publication type:
- Journal article
- Metadata:
-
- 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 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: \begin{align*} &{}\alpha_{E1} = 10.99 \pm 0.16 \pm 0.47 \pm 0.17 \pm 0.34 &{}\beta_{M1} = 3.14 \pm 0.21 \pm 0.24 \pm 0.20 \pm 0.35 \end{align*} in units of $10^{-4}$\,fm$^3$ where the errors are statistical, systematic, spin polarizability dependent and model dependent.
- Autoren
- A2 Collaboration
- E Mornacchi
- PP Martel
- S Abt
- P Achenbach
- P Adlarson
- F Afzal
- Z Ahmed
- JRM Annand
- HJ Arends
- M Bashkanov
- R Beck
- M Biroth
- N Borisov
- A Braghieri
- WJ Briscoe
- F Cividini
- C Collicott
- S Costanza
- A Denig
- AS Dolzhikov
- EJ Downie
- P Drexler
- S Fegan
- S Gardner
- D Ghosal
- DI Glazier
- I Gorodnov
- W Gradl
- M Günther
- D Gurevich
- L Heijkenskjöld
- D Hornidge
- GM Huber
- A Käser
- VL Kashevarov
- SJD Kay
- M Korolija
- B Krusche
- A Lazarev
- K Livingston
- S Lutterer
- IJD MacGregor
- DM Manley
- R Miskimen
- M Mocanu
- C Mullen
- A Neganov
- A Neiser
- M Ostrick
- D Paudyal
- P Pedroni
- A Powell
- T Rostomyan
- V Sokhoyan
- K Spieker
- O Steffen
- I Strakovsky
- T Strub
- M Thiel
- A Thomas
- Yu A Usov
- S Wagner
- DP Watts
- D Werthmüller
- J Wettig
- M Wolfes
- N Zachariou
- Autoren-URL
- http://arxiv.org/abs/2110.15691v2
- Schlüsselwörter
- nucl-ex
- nucl-ex
- nucl-th
- Datum der Veröffentlichung
- 2021
- Datum der Datenerfassung
- 2021
- Datum, an dem der Datensatz öffentlich gemacht wurde
- 2021
- Titel
- Measurement of Compton scattering at MAMI for the extraction of the electric and magnetic polarizabilities of the proton
Files
2110.15691v2.pdf
Data source: arXiv
- Other metadata sources:
-
- 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 set-up. Using the highest statistics Compton scattering data ever measured on the proton along with two effective field theory models (both covariant baryon and heavy-baryon) in addition to fixed-$t$ dispersion relations and the Baldin sum rule, we have obtained the proton electric and magnetic polarizabilities with unprecedented precision: \begin{align*} &{}\alpha_{E1} = 10.99 \pm 0.16 \pm 0.47 \pm 0.17 \pm 0.34 &{}\beta_{M1} = 3.14 \pm 0.21 \pm 0.24 \pm 0.20 \pm 0.35 \end{align*} in units of $10^{-4}$\,fm$^3$ where the errors are statistical, systematic, spin polarizability dependent and model dependent.
- Autoren
- A2 Collaboration
- E Mornacchi
- PP Martel
- S Abt
- P Achenbach
- P Adlarson
- F Afzal
- Z Ahmed
- JRM Annand
- HJ Arends
- M Bashkanov
- R Beck
- M Biroth
- N Borisov
- A Braghieri
- WJ Briscoe
- F Cividini
- C Collicott
- S Costanza
- A Denig
- AS Dolzhikov
- EJ Downie
- P Drexler
- S Fegan
- S Gardner
- D Ghosal
- DI Glazier
- I Gorodnov
- W Gradl
- M Günther
- D Gurevich
- L Heijkenskjöld
- D Hornidge
- GM Huber
- A Käser
- VL Kashevarov
- SJD Kay
- M Korolija
- B Krusche
- A Lazarev
- K Livingston
- S Lutterer
- IJD MacGregor
- DM Manley
- R Miskimen
- M Mocanu
- C Mullen
- A Neganov
- A Neiser
- M Ostrick
- D Paudyal
- P Pedroni
- A Powell
- T Rostomyan
- V Sokhoyan
- K Spieker
- O Steffen
- I Strakovsky
- T Strub
- M Thiel
- A Thomas
- Yu A Usov
- S Wagner
- DP Watts
- D Werthmüller
- J Wettig
- M Wolfes
- N Zachariou
- Autoren-URL
- http://arxiv.org/abs/2110.15691v1
- Schlüsselwörter
- nucl-ex
- nucl-th
- Datum der Veröffentlichung
- 2021
- Datum der Datenerfassung
- 2022
- Titel
- Measurement of Compton scattering at MAMI for the extraction of the electric and magnetic polarizabilities of the proton
Data source: Manual
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