Signatures of the d^{*}(2380) Hexaquark in d(γ,pn[over →]).

Autor: Bashkanov M; Department of Physics, University of York, Heslington, York Y010 5DD, United Kingdom., Watts DP; Department of Physics, University of York, Heslington, York Y010 5DD, United Kingdom., Kay SJD; University of Regina, Regina, SK S4S0A2 Canada., 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., Afzal F; Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, 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., Beck R; Helmholtz-Institut für Strahlen- und Kernphysik, University 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.; Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy., Denig A; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Downie EJ; Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA., Drexler P; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.; II. Physikalisches Institut, University of Giessen, D-35392 Giessen, Germany., Fegan S; Department of Physics, University of York, Heslington, York Y010 5DD, United Kingdom., Fix A; Tomsk Polytechnic University, 634034 Tomsk, Russia., Gardner S; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom., Ghosal D; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland., Glazier DI; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom., Gorodnov I; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Gradl W; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Günther M; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland., Gurevich D; Institute for Nuclear Research, RU-125047 Moscow, Russia., Heijkenskjöld L; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Hornidge D; Mount Allison University, Sackville, New Brunswick E4L1E6, Canada., Huber GM; University of Regina, Regina, SK S4S0A2 Canada., Käser A; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland., Kashevarov VL; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Korolija M; Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia., Krusche B; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland., Lazarev A; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Livingston K; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom., Lutterer S; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland., MacGregor IJD; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom., Manley DM; Kent State University, Kent, Ohio 44242, USA., Martel PP; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.; Mount Allison University, Sackville, New Brunswick E4L1E6, Canada., Miskimen R; University of Massachusetts, Amherst, Massachusetts 01003, USA., Mornacchi E; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Mullen C; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom., Neganov A; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Neiser A; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Ostrick M; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Otte PB; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Paudyal D; University of Regina, Regina, SK S4S0A2 Canada., Pedroni P; INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy., Powell A; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom., Prakhov SN; University of California Los Angeles, Los Angeles, California 90095-1547, USA., Ron G; Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel., Sarty A; Department of Astronomy and Physics, Saint Mary's University, E4L1E6 Halifax, Canada., Sfienti C; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Sokhoyan V; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Spieker K; Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany., Steffen O; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Strakovsky II; Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA., Strub T; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland., Supek I; Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia., Thiel A; Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany., Thiel M; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Thomas A; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Usov YA; Joint Institute for Nuclear Research, 141980 Dubna, Russia., Wagner S; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Walford NK; Department of Physics, University of Basel, Ch-4056 Basel, Switzerland., Werthmüller D; Department of Physics, University of York, Heslington, York Y010 5DD, United Kingdom., Wettig J; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Wolfes M; Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany., Zachariou N; Department of Physics, University of York, Heslington, York Y010 5DD, United Kingdom., Zana LA; Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2020 Apr 03; Vol. 124 (13), pp. 132001.
DOI: 10.1103/PhysRevLett.124.132001
Abstrakt: We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300-700 MeV provides the first measurement of recoil neutron polarization at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarization in a narrow structure centered around E_{γ}∼570  MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation of the d^{*}(2380) hexaquark.
Databáze: MEDLINE