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Observation of a narrow structure in p(gamma,K_s)X via interference with phi-meson production

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arxiv 1110.3325 v3 pith:TX2P5H6J submitted 2011-10-14 hep-ex hep-phnucl-ex

M. J. Amaryan , G. Gavalian , C. Nepali , M. V. Polyakov , Ya. Azimov , W. J. Briscoe , G. E. Dodge , C. E. Hyde
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F. Klein V. Kuznetsov I. Strakovsky J. Zhang
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classification hep-exhep-phnucl-ex
keywords structurebackgroundgammahypothesisinterferencenarrowobservationobserved
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We report observation of a narrow peak structure at ~1.54 GeV with a Gaussian width sigma=6 MeV in the missing of K_s in the reaction gamma+p = pK_sK_L. The observed structure may be due to the interference between a strange (or anti-strange) baryon resonance in the pK_L system and the phi(K_sK_L) photoproduction leading to the same final state. The statistical significance of the observed excess of events estimated as the log likelihood ratio of the resonant signal+background hypothesis and the phi-production based background only hypothesis corresponds to 5.3 sigma.

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Cited by 2 Pith papers

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

  1. Pentaquarks and Maxim V. Polyakov

    hep-ph 2024-11 conditional novelty 3.0 of 10

    A review argues that Diakonov-Petrov-Polyakov's narrow-width Theta+ pentaquark prediction remains viable, identifying N*(1685) as the antidecuplet partner and citing LEPS/DIANA data as support.

  2. Odyssey of the elusive $\Theta^+$

    hep-ph 2024-11 conditional novelty 2.0 of 10

    A review of the Theta+ pentaquark story concludes that the chiral soliton model's small-width prediction remains viable and new kaon-beam experiments may decide its existence.

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