Signatures of the d∗ (2380) Hexaquark in d (γ,p n →)

(A2 Collaboration at MAMI)

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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 Eγ∼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.

Original languageAmerican English
Article number132001
JournalPhysical Review Letters
Issue number13
StatePublished - 3 Apr 2020

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© 2020 authors. Published by the American Physical Society.


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