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Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron

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arxiv hep-ex/0301020 v2 pith:XZGAG4AR submitted 2003-01-14 hep-ex

classification hep-ex
keywords resonancebaryonneutronalternativelyanglesanti-decupletbaryonsbeen
verification ladder T0 review T1 audit T2 compute T3 formal
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The gamma n -> K+ K- n reaction on 12C has been studied by measuring both K+ and K- at forward angles. A sharp baryon resonance peak was observed at 1.54 +- 0.01 GeV with a width smaller than 25 MeV and a Gaussian significance of 4.6 sigma. The strangeness quantum number (S) of the baryon resonance is +1. It can be interpreted as a molecular meson-baryon resonance or alternatively as an exotic 5-quark state (uudd{s_bar}) that decays into a K+ and a neutron. The resonance is consistent with the lowest member of an anti-decuplet of baryons predicted by the chiral soliton model.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. $S$-wave $KN$ scattering in a renormalizable chiral effective field theory

    nucl-th 2025-12 unverdicted novelty 6.0 of 10

    A renormalizable covariant chiral EFT calculation of s-wave KN scattering yields a good description of I=1 phase shifts with a negative effective range while the I=0 channel remains weakly constrained.

  2. $S$-wave kaon-nucleon interactions from lattice QCD at the physical point

    hep-lat 2025-08 conditional novelty 6.0 of 10

    First physical-point lattice QCD calculation of S-wave kaon-nucleon interactions finds no resonance or bound state, with scattering lengths -0.226(5) fm (I=1) and +0.031(62) fm (I=0).

  3. Pentaquarks made of light quarks and their admixture to baryons

    hep-ph 2025-07 conditional novelty 6.0 of 10

    Light pentaquark wavefunctions are constructed from permutation symmetry, and a nucleon-pentaquark mixing model yields a five-quark Fock probability P5q of order 0.4.

  4. Comprehensive Mass Predictions: From Triply Heavy Baryons to Pentaquarks

    hep-ph 2026-03 unverdicted novelty 4.0 of 10

    Machine learning models trained on known hadron data and an extended Gürsey-Radicati mass formula predict masses for triply heavy baryons and numerous pentaquark states, agreeing with available data and forecasting un...

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