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

M Bashkanov¹, D P Watts¹, S J D Kay², S Abt³, P Achenbach⁴, P Adlarson⁴, F Afzal⁵, Z Ahmed², C S Akondi⁶, J R M Annand⁷, H J Arends⁴, R Beck⁵, M Biroth⁴, N Borisov⁸, A Braghieri⁹, W J Briscoe¹⁰, F Cividini⁴, C Collicott¹¹, S Costanza^{9

12}, A Denig⁴, E J Downie¹⁰, P Drexler^{4

13}, S Fegan¹, A Fix¹⁴, S Gardner⁷, D Ghosal³, D I Glazier⁷, I Gorodnov⁸, W Gradl⁴, M Günther³, D Gurevich¹⁵, L Heijkenskjöld⁴, D Hornidge¹⁶, G M Huber², A Käser³, V L Kashevarov^{4

8}, M Korolija¹⁷, B Krusche³, A Lazarev⁸, K Livingston⁷, S Lutterer³, I J D MacGregor⁷, D M Manley⁶, P P Martel^{4

16}, R Miskimen¹⁸, E Mornacchi⁴, C Mullen⁷, A Neganov⁸, A Neiser⁴, M Ostrick⁴, P B Otte⁴, D Paudyal², P Pedroni⁹, A Powell⁷, S N Prakhov¹⁹, G Ron²⁰, A Sarty¹¹, C Sfienti⁴, V Sokhoyan⁴, K Spieker⁵, O Steffen⁴, I I Strakovsky¹⁰, T Strub³, I Supek¹⁷, A Thiel⁵, M Thiel⁴, A Thomas⁴, Yu A Usov⁸, S Wagner⁴, N K Walford³, D Werthmüller¹, J Wettig⁴, M Wolfes⁴, N Zachariou¹, L A Zana²¹; A2 Collaboration at MAMI

Affiliations

¹ Department of Physics, University of York, Heslington, York Y010 5DD, United Kingdom.
² University of Regina, Regina, SK S4S0A2 Canada.
³ Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.
⁴ Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
⁵ Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany.
⁶ Kent State University, Kent, Ohio 44242, USA.
⁷ SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁸ Joint Institute for Nuclear Research, 141980 Dubna, Russia.
⁹ INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.
¹⁰ Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.
¹¹ Department of Astronomy and Physics, Saint Mary's University, E4L1E6 Halifax, Canada.
¹² Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy.
¹³ II. Physikalisches Institut, University of Giessen, D-35392 Giessen, Germany.
¹⁴ Tomsk Polytechnic University, 634034 Tomsk, Russia.
¹⁵ Institute for Nuclear Research, RU-125047 Moscow, Russia.
¹⁶ Mount Allison University, Sackville, New Brunswick E4L1E6, Canada.
¹⁷ Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
¹⁸ University of Massachusetts, Amherst, Massachusetts 01003, USA.
¹⁹ University of California Los Angeles, Los Angeles, California 90095-1547, USA.
²⁰ Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel.
²¹ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.

PMID: 32302204
DOI: 10.1103/PhysRevLett.124.132001

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

M Bashkanov et al. Phys Rev Lett. 2020.

. 2020 Apr 3;124(13):132001.

doi: 10.1103/PhysRevLett.124.132001.

Authors

Affiliations

¹ Department of Physics, University of York, Heslington, York Y010 5DD, United Kingdom.
² University of Regina, Regina, SK S4S0A2 Canada.
³ Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.
⁴ Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
⁵ Helmholtz-Institut für Strahlen- und Kernphysik, University Bonn, D-53115 Bonn, Germany.
⁶ Kent State University, Kent, Ohio 44242, USA.
⁷ SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
⁸ Joint Institute for Nuclear Research, 141980 Dubna, Russia.
⁹ INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.
¹⁰ Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.
¹¹ Department of Astronomy and Physics, Saint Mary's University, E4L1E6 Halifax, Canada.
¹² Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy.
¹³ II. Physikalisches Institut, University of Giessen, D-35392 Giessen, Germany.
¹⁴ Tomsk Polytechnic University, 634034 Tomsk, Russia.
¹⁵ Institute for Nuclear Research, RU-125047 Moscow, Russia.
¹⁶ Mount Allison University, Sackville, New Brunswick E4L1E6, Canada.
¹⁷ Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.
¹⁸ University of Massachusetts, Amherst, Massachusetts 01003, USA.
¹⁹ University of California Los Angeles, Los Angeles, California 90095-1547, USA.
²⁰ Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel.
²¹ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.

PMID: 32302204
DOI: 10.1103/PhysRevLett.124.132001

Abstract

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.

PubMed Disclaimer

LinkOut - more resources

Full Text Sources
- American Physical Society

Save citation to file

Email citation

Add to Collections

Add to My Bibliography

Your saved search

Create a file for external citation management software

Your RSS Feed

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

Affiliations

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

Authors

Affiliations

Abstract

LinkOut - more resources

Full Text Sources