Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons
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, lo...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S037026932300607X |
| _version_ | 1797454327707598848 |
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| author | 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 |
| author_facet | 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 |
| author_sort | D. Ghosal |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-09T15:35:41Z |
| format | Article |
| id | doaj.art-0cb1f1fd23da44c3bd6e7a19d54668a5 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-03-09T15:35:41Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-0cb1f1fd23da44c3bd6e7a19d54668a52023-11-26T05:11:22ZengElsevierPhysics Letters B0370-26932023-12-01847138273Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleonsD. Ghosal0V. Sokhoyan1A. Fix2S. Lutterer3S. Abt4P. Achenbach5F. Afzal6Z. Ahmed7J.R.M. Annand8M. Bashkanov9R. Beck10M. Biroth11N. Borisov12A. Braghieri13W.J. Briscoe14F. Cividini15C. Collicot16S. Costanza17A. Denig18M. Dieterle19A.S. Dolzhikov20E.J. Downie21P. Drexler22S. Fegan23S. Gardner24D.I. Glazier25I. Gorodnov26W. Gradl27M. Günther28D. Gurevich29L. Heijkenskjöld30D. Hornidge31G.M. Huber32N. Jermann33A. Käser34V.L. Kashevarov35M. Korolija36B. Krusche37A. Lazarev38K. Livingston39I.J.D. MacGregor40D.M. Manley41P.P. Martel42Ch. Meier43R. Miskimen44M. Mocanu45E. Mornacchi46C. Mullen47A. Neganov48A. Neiser49M. Ostrick50P. Otte51D. Paudyal52P. Pedroni53A. Powell54G. Reicherz55T. Rostomyan56K. Spieker57O. Steffen58I.I. Strakovsky59A. Thiel60M. Thiel61A. Thomas62M. Unverzagt63Yu.A. Usov64S. Wagner65N.K. Walford66D.P. Watts67D. Werthmüller68J. Wettig69L. Witthauer70M. Wolfes71N. Zachariou72Department of Physics, University of Basel, Ch-4056 Basel, Switzerland; Corresponding author.Institut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyTomsk Polytechnic University, Tomsk, RussiaDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyHelmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, GermanyUniversity of Regina, Regina, SK S4S-0A2 CanadaSUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United KingdomDepartment of Physics, University of York, Heslington, York, Y010 5DD, UKHelmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, GermanyInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyJoint Institute for Nuclear Research, 141980 Dubna, RussiaINFN Sezione di Pavia, I-27100 Pavia, Pavia, ItalyCenter for Nuclear Studies, The George Washington University, Washington, DC 20052, USAInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyDepartment of Astronomy and Physics, Saint Mary's University, E4L1E6 Halifax, CanadaINFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy; Dipartimento di Fisica, Università di Pavia, Pavia, ItalyInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandJoint Institute for Nuclear Research, 141980 Dubna, RussiaCenter for Nuclear Studies, The George Washington University, Washington, DC 20052, USAInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyDepartment of Physics, University of York, Heslington, York, Y010 5DD, UKSUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United KingdomSUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United KingdomJoint Institute for Nuclear Research, 141980 Dubna, RussiaInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandInstitute for Nuclear Research, RU-125047 Moscow, RussiaInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyMount Allison University, Sackville, New Brunswick E4L1E6, CanadaUniversity of Regina, Regina, SK S4S-0A2 CanadaDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandLebedev Physical Institute, RU-119991 Moscow, Russia; Institut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyRudjer Boskovic Institute, HR-10000 Zagreb, CroatiaDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandJoint Institute for Nuclear Research, 141980 Dubna, RussiaSUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United KingdomSUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United KingdomKent State University, Kent, OH 44242, USAInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandUniversity of Massachusetts, Amherst, MA 01003, USADepartment of Physics, University of York, Heslington, York, Y010 5DD, UKInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanySUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United KingdomJoint Institute for Nuclear Research, 141980 Dubna, RussiaInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyUniversity of Regina, Regina, SK S4S-0A2 CanadaINFN Sezione di Pavia, I-27100 Pavia, Pavia, ItalySUPA School of Physics and Astronomy, University of Glasgow, G12 8QQ, United KingdomInstitut für Experimentalphysik, Ruhr Universität, 44780 Bochum, GermanyDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandHelmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, GermanyInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyCenter for Nuclear Studies, The George Washington University, Washington, DC 20052, USAHelmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, GermanyInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyJoint Institute for Nuclear Research, 141980 Dubna, RussiaInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandDepartment of Physics, University of York, Heslington, York, Y010 5DD, UKDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyDepartment of Physics, University of Basel, Ch-4056 Basel, SwitzerlandInstitut für Kernphysik, University of Mainz, D-55099 Mainz, GermanyDepartment of Physics, University of York, Heslington, York, Y010 5DD, UKPhotoproduction 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.http://www.sciencedirect.com/science/article/pii/S037026932300607X |
| spellingShingle | 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 Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons Physics Letters B |
| title | Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons |
| title_full | Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons |
| title_fullStr | Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons |
| title_full_unstemmed | Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons |
| title_short | Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons |
| title_sort | helicity dependent cross sections for the photoproduction of π0π pairs from quasi free nucleons |
| url | http://www.sciencedirect.com/science/article/pii/S037026932300607X |
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