Measurements of double-polarized compton scattering asymmetries and extraction of the proton spin polarizabilities

P P Martel^{1

2

3}, R Miskimen¹, P Aguar-Bartolome², J Ahrens², C S Akondi⁴, J R M Annand⁵, H J Arends², W Barnes¹, R Beck⁶, A Bernstein⁷, N Borisov⁸, A Braghieri⁹, W J Briscoe¹⁰, S Cherepnya¹¹, C Collicott^{12

13}, S Costanza⁹, A Denig², M Dieterle¹⁴, E J Downie^{2

5

10}, L V Fil'kov¹¹, S Garni¹⁴, D I Glazier^{5

15}, W Gradl², G Gurevich¹⁶, P Hall Barrientos¹⁵, D Hamilton⁵, D Hornidge³, D Howdle⁵, G M Huber¹⁷, T C Jude¹⁵, A Kaeser¹⁴, V L Kashevarov¹¹, I Keshelashvili¹⁴, R Kondratiev¹⁶, M Korolija¹⁸, B Krusche¹⁴, A Lazarev⁸, V Lisin¹⁶, K Livingston⁵, I J D MacGregor⁵, J Mancell⁵, D M Manley⁴, W Meyer¹⁹, D G Middleton^{2

3}, A Mushkarenkov¹, B M K Nefkens²⁰, A Neganov⁸, A Nikolaev⁶, M Oberle¹⁴, H Ortega Spina², M Ostrick², P Ott², P B Otte², B Oussena², P Pedroni⁹, A Polonski¹⁶, V Polyansky¹¹, S Prakhov^{2

10

20}, A Rajabi¹, G Reicherz¹⁹, T Rostomyan¹⁴, A Sarty¹³, S Schrauf², S Schumann², M H Sikora¹⁵, A Starostin²⁰, O Steffen², I I Strakovsky¹⁰, T Strub¹⁴, I Supek¹⁸, M Thiel²¹, L Tiator², A Thomas², M Unverzagt^{2

6}, Y Usov⁸, D P Watts¹⁵, L Witthauer¹⁴, D Werthmüller¹⁴, M Wolfes²; A2 Collaboration at MAMI

Affiliations

¹ Department of Physics, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA.
² Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany.
³ Department of Physics, Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada.
⁴ Department of Physics, Kent State University, Kent, Ohio 44242, USA.
⁵ SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁶ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany.
⁷ Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
⁸ Joint Institute for Nuclear Research (JINR), 141980 Dubna, Russia.
⁹ INFN Sezione di Pavia, I-27100 Pavia, Italy.
¹⁰ Department of Physics, The George Washington University, Washington, D.C. 20052, USA.
¹¹ Lebedev Physical Institute, 119991 Moscow, Russia.
¹² Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
¹³ Department of Astronomy and Physics, Saint Marys University, Halifax, Nova Scotia B3H 3C3, Canada.
¹⁴ Departement Physik, Universität Basel, CH-4056 Basel, Switzerland.
¹⁵ School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
¹⁶ Institute for Nuclear Research, 125047 Moscow, Russia.
¹⁷ Department of Physics, University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
¹⁸ Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
¹⁹ Institut für Experimentalphysik, Ruhr-Universität, D-44780 Bochum, Germany.
²⁰ Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA.
²¹ II. Physikalisches Institut, Universität Giessen, D-35392 Giessen, Germany.

PMID: 25839263
DOI: 10.1103/PhysRevLett.114.112501

Free article

Measurements of double-polarized compton scattering asymmetries and extraction of the proton spin polarizabilities

P P Martel et al. Phys Rev Lett. 2015.

Free article

. 2015 Mar 20;114(11):112501.

doi: 10.1103/PhysRevLett.114.112501. Epub 2015 Mar 19.

Authors

Affiliations

¹ Department of Physics, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA.
² Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany.
³ Department of Physics, Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada.
⁴ Department of Physics, Kent State University, Kent, Ohio 44242, USA.
⁵ SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁶ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany.
⁷ Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
⁸ Joint Institute for Nuclear Research (JINR), 141980 Dubna, Russia.
⁹ INFN Sezione di Pavia, I-27100 Pavia, Italy.
¹⁰ Department of Physics, The George Washington University, Washington, D.C. 20052, USA.
¹¹ Lebedev Physical Institute, 119991 Moscow, Russia.
¹² Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
¹³ Department of Astronomy and Physics, Saint Marys University, Halifax, Nova Scotia B3H 3C3, Canada.
¹⁴ Departement Physik, Universität Basel, CH-4056 Basel, Switzerland.
¹⁵ School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom.
¹⁶ Institute for Nuclear Research, 125047 Moscow, Russia.
¹⁷ Department of Physics, University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
¹⁸ Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
¹⁹ Institut für Experimentalphysik, Ruhr-Universität, D-44780 Bochum, Germany.
²⁰ Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095-1547, USA.
²¹ II. Physikalisches Institut, Universität Giessen, D-35392 Giessen, Germany.

PMID: 25839263
DOI: 10.1103/PhysRevLett.114.112501

Abstract

The spin polarizabilities of the nucleon describe how the spin of the nucleon responds to an incident polarized photon. The most model-independent way to extract the nucleon spin polarizabilities is through polarized Compton scattering. Double-polarized Compton scattering asymmetries on the proton were measured in the Δ(1232) region using circularly polarized incident photons and a transversely polarized proton target at the Mainz Microtron. Fits to asymmetry data were performed using a dispersion model calculation and a baryon chiral perturbation theory calculation, and a separation of all four proton spin polarizabilities in the multipole basis was achieved. The analysis based on a dispersion model calculation yields γ(E1E1)=-3.5±1.2, γ(M1M1)=3.16±0.85, γ(E1M2)=-0.7±1.2, and γ(M1E2)=1.99±0.29, in units of 10(-4) fm(4).

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Measurements of double-polarized compton scattering asymmetries and extraction of the proton spin polarizabilities

Affiliations

Measurements of double-polarized compton scattering asymmetries and extraction of the proton spin polarizabilities

Authors

Affiliations

Abstract

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