Abstract
The γp→K+Σ0 differential cross section at extremely forward angles was measured at the BGOOD experiment. A three-quarter drop in strength over a narrow range in energy and a strong dependence on the polar angle of the K+ in the centre-of-mass of the reaction is observed at a centre-of-mass energy of 1900 MeV. Residing close to multiple open and hidden strangeness thresholds, the structure appears consistent with meson-baryon threshold effects which may contribute to the reaction mechanism.
Highlights
Recent discoveries of “exotic” multi-quark hadronic states beyond the conventional three and two constituent quark models have challenged the understanding of the degrees of freedom af-forded in QCD
The γ p → K + 0 differential cross section at extremely forward angles was measured at the BGOOD
Descriptions of multi-quark states have existed since the conception of quark models [6,7,8], and due to the proximity of the chiral symmetry breaking scale to the nucleon mass, it is possible that light mesons effectively interact as elementary objects, giving rise to molecular systems and meson re-scattering effects near thresholds [9,10]
Summary
Recent discoveries of “exotic” multi-quark hadronic states beyond the conventional three and two constituent quark models have challenged the understanding of the degrees of freedom af-forded in QCD. Similar states may have been observed in K 0 + photoproduction, where a “cusp” was observed where the cross section quickly reduces by a factor of 75% at the K ∗ and K ∗ 0 thresholds [19,20]. This was described by the destructive interference of amplitudes driven by intermediate K ∗ and K ∗ channels [21]
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