1110.3325 (M. J. Amaryan et al.)

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

M. J. Amaryan, G. Gavalian, C. Nepali, M. V. Polyakov, Ya. Azimov, W. J. Briscoe, G. E. Dodge, C. E. Hyde, F. Klein, V. Kusnetsov, I. Strakovsky, J. Zhang

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 5.9 sigma.

View original: http://arxiv.org/abs/1110.3325