Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Signatures of the $d^*(2380)$ hexaquark in d($\gamma$,$p\vec{n}$)   We report a measurement of the spin polarisation of the recoiling neutron in
deuterium photodisintegration, utilising 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 polarisation 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 polarisation in a narrow structure centred around
$E_{\gamma}\sim$~570~MeV is observed, which is inconsistent with current
theoretical predictions employing nucleon resonance degrees of freedom. A
Legendre polynomial decomposition suggests this behaviour could be related to
the excitation of the $d^*(2380)$ hexaquark.

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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: q-bio
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org