Physics Letters B (Mar 2020)
Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead
- V. Sokhoyan,
- S. Prakhov,
- A. Fix,
- S. Abt,
- P. Achenbach,
- P. Adlarson,
- F. Afzal,
- P. Aguar-Bartolomé,
- Z. Ahmed,
- K. Altangerel,
- J.R.M. Annand,
- H.J. Arends,
- K. Bantawa,
- M. Bashkanov,
- R. Beck,
- M. Biroth,
- N.S. Borisov,
- A. Braghieri,
- W.J. Briscoe,
- S. Cherepnya,
- F. Cividini,
- C. Collicott,
- S. Costanza,
- A. Denig,
- M. Dieterle,
- E.J. Downie,
- P. Drexler,
- M.I. Ferretti Bondy,
- L.V. Fil'kov,
- S. Gardner,
- S. Garni,
- D.I. Glazier,
- I. Gorodnov,
- W. Gradl,
- M. Günther,
- G.M. Gurevich,
- L. Heijkenskjöld,
- D. Hornidge,
- G.M. Huber,
- A. Käser,
- V.L. Kashevarov,
- S. Kay,
- I. Keshelashvili,
- R. Kondratiev,
- M. Korolija,
- B. Krusche,
- A. Lazarev,
- K. Livingston,
- S. Lutterer,
- I.J.D. MacGregor,
- R. Macrae,
- D.M. Manley,
- P.P. Martel,
- J.C. McGeorge,
- D.G. Middleton,
- R. Miskimen,
- E. Mornacchi,
- C. Mullen,
- A. Mushkarenkov,
- A. Neganov,
- A. Neiser,
- M. Oberle,
- M. Ostrick,
- P.B. Otte,
- D. Paudyal,
- P. Pedroni,
- A. Powell,
- E. Rickert,
- G. Ron,
- T. Rostomyan,
- A. Sarty,
- C. Sfienti,
- K. Spieker,
- O. Steffen,
- I.I. Strakovsky,
- B. Strandberg,
- Th. Strub,
- I. Supek,
- A. Thiel,
- M. Thiel,
- A. Thomas,
- M. Unverzagt,
- Yu.A. Usov,
- S. Wagner,
- N.K. Walford,
- D.P. Watts,
- D. Werthmüller,
- J. Wettig,
- L. Witthauer,
- M. Wolfes,
- N. Zachariou
Affiliations
- V. Sokhoyan
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany; Corresponding author.
- S. Prakhov
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany; University of California Los Angeles, Los Angeles, CA 90095-1547, USA
- A. Fix
- Tomsk Polytechnic University, 634034 Tomsk, Russia
- S. Abt
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- P. Achenbach
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- P. Adlarson
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- F. Afzal
- Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany
- P. Aguar-Bartolomé
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- Z. Ahmed
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
- K. Altangerel
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- J.R.M. Annand
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- H.J. Arends
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- K. Bantawa
- Kent State University, Kent, OH 44242-0001, USA
- M. Bashkanov
- Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom
- R. Beck
- Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany
- M. Biroth
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- N.S. Borisov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- A. Braghieri
- INFN Sezione di Pavia, I-27100 Pavia, Italy
- W.J. Briscoe
- The George Washington University, Washington, DC 20052-0001, USA
- S. Cherepnya
- Lebedev Physical Institute, 119991 Moscow, Russia
- F. Cividini
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- C. Collicott
- Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada; Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
- S. Costanza
- INFN Sezione di Pavia, I-27100 Pavia, Italy; Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy
- A. Denig
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- M. Dieterle
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- E.J. Downie
- The George Washington University, Washington, DC 20052-0001, USA
- P. Drexler
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- M.I. Ferretti Bondy
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- L.V. Fil'kov
- Lebedev Physical Institute, 119991 Moscow, Russia
- S. Gardner
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- S. Garni
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- D.I. Glazier
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom; Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom
- I. Gorodnov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- W. Gradl
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- M. Günther
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- G.M. Gurevich
- Institute for Nuclear Research, 125047 Moscow, Russia
- L. Heijkenskjöld
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- D. Hornidge
- Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada
- G.M. Huber
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
- A. Käser
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- V.L. Kashevarov
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany; Joint Institute for Nuclear Research, 141980 Dubna, Russia
- S. Kay
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
- I. Keshelashvili
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- R. Kondratiev
- Institute for Nuclear Research, 125047 Moscow, Russia
- M. Korolija
- Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia
- B. Krusche
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- A. Lazarev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- K. Livingston
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- S. Lutterer
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- I.J.D. MacGregor
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- R. Macrae
- 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
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany; Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada
- J.C. McGeorge
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- D.G. Middleton
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany; Mount Allison University, Sackville, New Brunswick E4L 1E6, Canada
- R. Miskimen
- University of Massachusetts, Amherst, MA 01003, USA
- E. Mornacchi
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- C. Mullen
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- A. Mushkarenkov
- INFN Sezione di Pavia, I-27100 Pavia, Italy; University of Massachusetts, Amherst, MA 01003, USA
- A. Neganov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- A. Neiser
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- M. Oberle
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- M. Ostrick
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- P.B. Otte
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- D. Paudyal
- University of Regina, Regina, Saskatchewan S4S 0A2, Canada
- P. Pedroni
- INFN Sezione di Pavia, I-27100 Pavia, Italy
- A. Powell
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- E. Rickert
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- G. Ron
- Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel
- T. Rostomyan
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- A. Sarty
- Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada
- C. Sfienti
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- K. Spieker
- Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany
- O. Steffen
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- I.I. Strakovsky
- The George Washington University, Washington, DC 20052-0001, USA
- B. Strandberg
- SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
- Th. Strub
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- I. Supek
- Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia
- A. Thiel
- Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany
- M. Thiel
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- A. Thomas
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- M. Unverzagt
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- Yu.A. Usov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- S. Wagner
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- N.K. Walford
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- D.P. Watts
- Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom
- D. Werthmüller
- Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom
- J. Wettig
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- L. Witthauer
- Institut für Physik, University of Basel, CH-4056 Basel, Switzerland
- M. Wolfes
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- N. Zachariou
- Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom
- Journal volume & issue
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Vol. 802
Abstract
The beam-helicity asymmetry was measured, for the first time, in photoproduction of π0η pairs on carbon, aluminum, and lead, with the A2 experimental setup at MAMI. The results are compared to an earlier measurement on a free proton and to the corresponding theoretical calculations. The Mainz model is used to predict the beam-helicity asymmetry for the nuclear targets. The present results indicate that the photoproduction mechanism for π0η pairs on nuclei is similar to photoproduction on a free nucleon. This process is dominated by the D33 partial wave with the ηΔ(1232) intermediate state.
