Physics Letters B (Nov 2015)
Threshold π0 photoproduction on transverse polarised protons at MAMI
- S. Schumann,
- P.B. Otte,
- C.S. Akondi,
- J.R.M. Annand,
- H.-J. Arends,
- R. Beck,
- A.M. Bernstein,
- N. Borisov,
- A. Braghieri,
- W.J. Briscoe,
- S. Cherepnya,
- C. Collicott,
- S. Costanza,
- E.J. Downie,
- M. Dieterle,
- C. Fernández-Ramírez,
- A. Fix,
- L.V. Fil'kov,
- S. Garni,
- D.I. Glazier,
- W. Gradl,
- G. Gurevich,
- P. Hall-Barrientos,
- D. Hamilton,
- D. Hornidge,
- D. Howdle,
- G.M. Huber,
- V.L. Kashevarov,
- I. Keshelashvili,
- R. Kondratiev,
- M. Korolija,
- B. Krusche,
- A. Lazarev,
- V. Lisin,
- K. Livingston,
- I.J.D. MacGregor,
- J. Mancel,
- D.M. Manley,
- P.P. Martel,
- E.F. McNicoll,
- W. Meyer,
- D. Middleton,
- R. Miskimen,
- A. Mushkarenkov,
- B.M.K. Nefkens,
- A. Neganov,
- A. Nikolaev,
- M. Oberle,
- M. Ostrick,
- H. Ortega,
- P. Ott,
- B. Oussena,
- D. Paudyal,
- P. Pedroni,
- A. Polonski,
- V.V. Polyanski,
- S. Prakhov,
- G. Reicherz,
- T. Rostomyan,
- A. Sarty,
- M.H. Sikora,
- V. Sokhoyan,
- O. Steffen,
- I.I. Strakovsky,
- Th. Strub,
- I. Supek,
- L. Tiator,
- A. Thomas,
- M. Unverzagt,
- Yu.A. Usov,
- D.P. Watts,
- D. Werthmüller,
- L. Witthauer,
- M. Wolfes
Affiliations
- S. Schumann
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- P.B. Otte
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- C.S. Akondi
- Kent State University, Kent, OH 44242-0001, USA
- J.R.M. Annand
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- H.-J. Arends
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- R. Beck
- Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany
- A.M. Bernstein
- Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA
- N. Borisov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- A. Braghieri
- INFN Sezione di Pavia, 27100 Pavia PV, Italy
- W.J. Briscoe
- The George Washington University, Washington, DC 20052-0001, USA
- S. Cherepnya
- Lebedev Physical Institute, 119991 Moscow, Russia
- C. Collicott
- Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
- S. Costanza
- INFN Sezione di Pavia, 27100 Pavia PV, Italy
- E.J. Downie
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- M. Dieterle
- Departement für Physik, Universität Basel, 4056 Basel, Switzerland
- C. Fernández-Ramírez
- Jefferson Lab, Newport News, VA 23606, USA
- A. Fix
- Laboratory of Mathematical Physics, Tomsk Polytechnic University, 634034 Tomsk, Russia
- L.V. Fil'kov
- Lebedev Physical Institute, 119991 Moscow, Russia
- S. Garni
- Departement für Physik, Universität Basel, 4056 Basel, Switzerland
- D.I. Glazier
- SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- W. Gradl
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- G. Gurevich
- Institute for Nuclear Research, 125047 Moscow, Russia
- P. Hall-Barrientos
- SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- D. Hamilton
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- D. Hornidge
- Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada
- D. Howdle
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- G.M. Huber
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
- V.L. Kashevarov
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- I. Keshelashvili
- Departement für Physik, Universität Basel, 4056 Basel, Switzerland
- R. Kondratiev
- Institute for Nuclear Research, 125047 Moscow, Russia
- M. Korolija
- Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia
- B. Krusche
- Departement für Physik, Universität Basel, 4056 Basel, Switzerland
- A. Lazarev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- V. Lisin
- Institute for Nuclear Research, 125047 Moscow, Russia
- K. Livingston
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- I.J.D. MacGregor
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- J. Mancel
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- D.M. Manley
- Kent State University, Kent, OH 44242-0001, USA
- P.P. Martel
- University of Massachusetts, Amherst, MA 01003, USA
- E.F. McNicoll
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- W. Meyer
- Institut für Experimentalphysik, Ruhr-Universität, 44780 Bochum, Germany
- D. Middleton
- Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada
- R. Miskimen
- University of Massachusetts, Amherst, MA 01003, USA
- A. Mushkarenkov
- INFN Sezione di Pavia, 27100 Pavia PV, Italy
- B.M.K. Nefkens
- University of California Los Angeles, Los Angeles, CA 90095-1547, USA
- A. Neganov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- A. Nikolaev
- Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany
- M. Oberle
- Departement für Physik, Universität Basel, 4056 Basel, Switzerland
- M. Ostrick
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- H. Ortega
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- P. Ott
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- B. Oussena
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- D. Paudyal
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
- P. Pedroni
- INFN Sezione di Pavia, 27100 Pavia PV, Italy
- A. Polonski
- Institute for Nuclear Research, 125047 Moscow, Russia
- V.V. Polyanski
- Lebedev Physical Institute, 119991 Moscow, Russia
- S. Prakhov
- University of California Los Angeles, Los Angeles, CA 90095-1547, USA
- G. Reicherz
- Institut für Experimentalphysik, Ruhr-Universität, 44780 Bochum, Germany
- T. Rostomyan
- Departement für Physik, Universität Basel, 4056 Basel, Switzerland
- A. Sarty
- Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
- M.H. Sikora
- SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- V. Sokhoyan
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- O. Steffen
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- I.I. Strakovsky
- The George Washington University, Washington, DC 20052-0001, USA
- Th. Strub
- Departement für Physik, Universität Basel, 4056 Basel, Switzerland
- I. Supek
- Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia
- L. Tiator
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- A. Thomas
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- M. Unverzagt
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- Yu.A. Usov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- D.P. Watts
- SUPA School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- D. Werthmüller
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- L. Witthauer
- Departement für Physik, Universität Basel, 4056 Basel, Switzerland
- M. Wolfes
- Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany
- DOI
- https://doi.org/10.1016/j.physletb.2015.09.015
- Journal volume & issue
-
Vol. 750,
no. C
pp. 252 – 258
Abstract
Polarisation-dependent differential cross sections σT associated with the target asymmetry T have been measured for the reaction γp→→pπ0 with transverse target polarisation from π0 threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball / TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for σT have been used in combination with our previous measurements of the unpolarised cross section σ0 and the beam asymmetry Σ for a model-independent determination of S- and P-wave multipoles in the π0 threshold region, which includes for the first time a direct determination of the imaginary part of the E0+ multipole.
Keywords
