Physics Letters B (Dec 2023)
Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons
- D. Ghosal,
- V. Sokhoyan,
- A. Fix,
- S. Lutterer,
- S. Abt,
- P. Achenbach,
- F. Afzal,
- Z. Ahmed,
- J.R.M. Annand,
- M. Bashkanov,
- R. Beck,
- M. Biroth,
- N. Borisov,
- A. Braghieri,
- W.J. Briscoe,
- F. Cividini,
- C. Collicot,
- S. Costanza,
- A. Denig,
- M. Dieterle,
- A.S. Dolzhikov,
- E.J. Downie,
- P. Drexler,
- S. Fegan,
- S. Gardner,
- D.I. Glazier,
- I. Gorodnov,
- W. Gradl,
- M. Günther,
- D. Gurevich,
- L. Heijkenskjöld,
- D. Hornidge,
- G.M. Huber,
- N. Jermann,
- A. Käser,
- V.L. Kashevarov,
- M. Korolija,
- B. Krusche,
- A. Lazarev,
- K. Livingston,
- I.J.D. MacGregor,
- D.M. Manley,
- P.P. Martel,
- Ch. Meier,
- R. Miskimen,
- M. Mocanu,
- E. Mornacchi,
- C. Mullen,
- A. Neganov,
- A. Neiser,
- M. Ostrick,
- P. Otte,
- D. Paudyal,
- P. Pedroni,
- A. Powell,
- G. Reicherz,
- T. Rostomyan,
- K. Spieker,
- O. Steffen,
- I.I. Strakovsky,
- 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
- D. Ghosal
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland; Corresponding author.
- V. Sokhoyan
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- A. Fix
- Tomsk Polytechnic University, Tomsk, Russia
- S. Lutterer
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- S. Abt
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- P. Achenbach
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- F. Afzal
- Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany
- Z. Ahmed
- University of Regina, Regina, SK S4S-0A2 Canada
- J.R.M. Annand
- SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United Kingdom
- M. Bashkanov
- Department of Physics, University of York, Heslington, York, Y010 5DD, UK
- R. Beck
- Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany
- M. Biroth
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- N. Borisov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- A. Braghieri
- INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy
- W.J. Briscoe
- Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA
- F. Cividini
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- C. Collicot
- Department of Astronomy and Physics, Saint Mary's University, E4L1E6 Halifax, Canada
- S. Costanza
- INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy; Dipartimento di Fisica, Università di Pavia, Pavia, Italy
- A. Denig
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- M. Dieterle
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- A.S. Dolzhikov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- E.J. Downie
- Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA
- P. Drexler
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- S. Fegan
- Department of Physics, University of York, Heslington, York, Y010 5DD, UK
- S. Gardner
- SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United Kingdom
- D.I. Glazier
- SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, 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
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- D. Gurevich
- Institute for Nuclear Research, RU-125047 Moscow, Russia
- L. Heijkenskjöld
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- D. Hornidge
- Mount Allison University, Sackville, New Brunswick E4L1E6, Canada
- G.M. Huber
- University of Regina, Regina, SK S4S-0A2 Canada
- N. Jermann
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- A. Käser
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- V.L. Kashevarov
- Lebedev Physical Institute, RU-119991 Moscow, Russia; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- M. Korolija
- Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia
- B. Krusche
- Department of Physics, 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, G12 8QQ, United Kingdom
- I.J.D. MacGregor
- SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United Kingdom
- D.M. Manley
- Kent State University, Kent, OH 44242, USA
- P.P. Martel
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- Ch. Meier
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- R. Miskimen
- University of Massachusetts, Amherst, MA 01003, USA
- M. Mocanu
- Department of Physics, University of York, Heslington, York, Y010 5DD, UK
- E. Mornacchi
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- C. Mullen
- SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United Kingdom
- A. Neganov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- A. Neiser
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- M. Ostrick
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- P. Otte
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- D. Paudyal
- University of Regina, Regina, SK S4S-0A2 Canada
- P. Pedroni
- INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy
- A. Powell
- SUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United Kingdom
- G. Reicherz
- Institut für Experimentalphysik, Ruhr Universität, 44780 Bochum, Germany
- T. Rostomyan
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- K. Spieker
- Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany
- O. Steffen
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- I.I. Strakovsky
- Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA
- A. Thiel
- Helmholtz-Institut für Strahlen- und Kernphysik, University 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
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- D.P. Watts
- Department of Physics, University of York, Heslington, York, Y010 5DD, UK
- D. Werthmüller
- Department of Physics, University of Basel, Ch-4056 Basel, Switzerland
- J. Wettig
- Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany
- L. Witthauer
- Department of Physics, 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, UK
- Journal volume & issue
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Vol. 847
p. 138273
Abstract
Photoproduction of π0π±-pairs from quasifree nucleons bound in the deuteron has been investigated to study the helicity dependence of this reaction. Measurements with a liquid deuterium target were used to extract the unpolarized cross sections for reactions on protons and neutrons. A deuterated, longitudinally polarized solid-butanol target, together with a circularly polarized photon beam, determined the double polarization observable E. From these results the spin-dependent cross sections σ1/2 and σ3/2, corresponding to the anti-parallel and parallel spin configurations of the beam photon and target nucleon, have been derived. The measurements were performed at the Mainz MAMI accelerator with tagged, circularly-polarized photon beams produced via bremsstrahlung from longitudinally polarized electron beams. The reaction products were detected with an almost 4π solid-angle covering calorimeter composed of the Crystal Ball and TAPS detectors, supplemented by plastic scintillation detectors for charged particle identification. The results are sensitive to sequential decays of nucleon resonances via intermediate states and also to the decay of nucleon resonances by emission of charged ρ mesons, and are compared to recent model results.
