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First Measurement Using Elliptically Polarized Photons of the Double-Polarization Observable E for γp→pπ
Afzal, F; Spieker, K; Hurck, P; Abt, S; Achenbach, P; Adlarson, P; Ahmed, Z; Akondi, C S; Annand, J R M; Arends, H J; Bashkanov, M; Beck, R; Biroth, M; Borisov, N; Braghieri, A; Briscoe, W J; Cividini, F; Collicott, C; Costanza, S; Denig, A; Dieterle, M; Downie, E J; Drexler, P; Fegan, S; Gardner, S; Ghosal, D; Glazier, D I; Gorodnov, I; Gradl, W; Gurevich, D; Heijkenskjöld, L; Hornidge, D; Huber, G M; Kashevarov, V L; Kay, S J D; Korolija, M; Krusche, B; Lazarev, A; Livingston, K; Lutterer, S; MacGregor, I J D; Macrae, R G; Manley, D M; Martel, P P; Miskimen, R; Mocanu, M; Mornacchi, E; Mullen, C; Neganov, A; Neiser, A.
Afiliação
  • Afzal F; Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany.
  • Spieker K; Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany.
  • Hurck P; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Abt S; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.
  • Achenbach P; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Adlarson P; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Ahmed Z; University of Regina, Regina, SK S4S0A2, Canada.
  • Akondi CS; Kent State University, Kent, Ohio 44242, USA.
  • Annand JRM; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Arends HJ; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Bashkanov M; Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.
  • Beck R; Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany.
  • Biroth M; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Borisov N; Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Braghieri A; INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.
  • Briscoe WJ; Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.
  • Cividini F; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Collicott C; Department of Astronomy and Physics, Saint Mary's University, E4L1E6 Halifax, Canada.
  • Costanza S; INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.
  • Denig A; Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy.
  • Dieterle M; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Downie EJ; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.
  • Drexler P; Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.
  • Fegan S; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Gardner S; II. Physikalisches Institut, University of Giessen, D-35392 Giessen, Germany.
  • Ghosal D; Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.
  • Glazier DI; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Gorodnov I; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.
  • Gradl W; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Gurevich D; Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Heijkenskjöld L; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Hornidge D; Institute for Nuclear Research, RU-125047 Moscow, Russia.
  • Huber GM; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Kashevarov VL; Mount Allison University, Sackville, New Brunswick E4L1E6, Canada.
  • Kay SJD; University of Regina, Regina, SK S4S0A2, Canada.
  • Korolija M; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Krusche B; Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Lazarev A; Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.
  • Livingston K; Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
  • Lutterer S; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.
  • MacGregor IJD; Joint Institute for Nuclear Research, 141980 Dubna, Russia.
  • Macrae RG; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Manley DM; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.
  • Martel PP; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Miskimen R; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.
  • Mocanu M; Kent State University, Kent, Ohio 44242, USA.
  • Mornacchi E; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
  • Mullen C; Mount Allison University, Sackville, New Brunswick E4L1E6, Canada.
  • Neganov A; University of Massachusetts, Amherst, Massachusetts 01003, USA.
  • Neiser A; Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.
Phys Rev Lett ; 132(12): 121902, 2024 Mar 22.
Article em En | MEDLINE | ID: mdl-38579200
ABSTRACT
We report the measurement of the helicity asymmetry E for the pπ^{0} and nπ^{+} final states using, for the first time, an elliptically polarized photon beam in combination with a longitudinally polarized target at the Crystal Ball experiment at MAMI. The results agree very well with data that were taken with a circularly polarized photon beam, showing that it is possible to simultaneously measure polarization observables that require linearly (e.g., G) and circularly polarized photons (e.g., E) and a longitudinally polarized target. The new data cover a photon energy range 270-1400 MeV for the pπ^{0} final state (230-842 MeV for the nπ^{+} final state) and the full range of pion polar angles, θ, providing the most precise measurement of the observable E. A moment analysis gives a clear observation of the pη cusp in the pπ^{0} final state.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Alemanha
Texto completo
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Alemanha