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

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

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