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Signatures of the d*(2380) Hexaquark in d(gamma,p(n)over-right-arrow)

Bashkanov, M. and Watts, D. P. and Kay, S. J. D. and Abt, S. and Achenbach, P. and Adlarson, P. and Afzal, F. and Ahmed, Z. and Akondi, C. S. and Annand, J. R. M. and Arends, H. J. and Beck, R. and Biroth, M. and Borisov, N. and Braghieri, A. and Briscoe, W. J. and Cividini, F. and Collicott, C. and Costanza, S. and Denig, A. and Downie, E. J. and Drexler, P. and Fegan, S. and Fix, A. and Gardner, S. and Ghosal, D. and Glazier, I. and Gorodnov, I. and Gradl, W. and Guenther, M. and Gurevich, D. and Heijkenskjoeld, L. and Hornidge, D. and Huber, G. M. and Kaeser, A. and Kashevarov, V. L. and Korolija, M. and Krusche, B. and Lazarev, A. and Livingston, K. and Lutterer, S. and MacGregor, I. J. D. and Manley, D. M. and Martel, P. P. and Miskimen, R. and Mornacchi, E. and Mullen, C. and Neganov, A. and Neiser, A. and Ostrick, M. and Otte, P. B. and Paudyal, D. and Pedroni, P. and Powell, A. and Prakhov, S. N. and Ron, G. and Sarty, A. and Sfienti, C. and Sokhoyan, V. and Spieker, K. and Steffen, O. and Strakovsky, I. I. and Strub, T. and Supek, I. and Thiel, A. and Thiel, M. and Thomas, A. and Usov, Yu A. and Wagner, S. and Walford, N. K. and Werthmueller, D. and Wettig, J. and Wolfes, M. and Zachariou, N. and Zana, L. A. and A2 Collaboration, . (2020) Signatures of the d*(2380) Hexaquark in d(gamma,p(n)over-right-arrow). Physical Review Letters, 124 (13). p. 132001.

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Official URL: https://edoc.unibas.ch/81869/

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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-gamma similar to 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:0031-9007
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:29 Mar 2021 08:37
Deposited On:29 Mar 2021 08:37

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