Observation of a narrow structure in H(,) via interference with -meson production

MJ Amaryan, G Gavalian, C Nepali, MV Polyakov… - Physical Review C …, 2012 - APS
MJ Amaryan, G Gavalian, C Nepali, MV Polyakov, Y Azimov, WJ Briscoe, GE Dodge
Physical Review C—Nuclear Physics, 2012APS
We report observation of a narrow peak structure at∼ 1.54 GeV with a Gaussian width σ= 6
MeV in the missing mass of KS in the reaction γ+ p→ p KSKL. The observed structure may
be due to the interference between a strange (or antistrange) baryon resonance in the p KL
system and the φ (KSKL) 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 φ-production-based background-only …
We report observation of a narrow peak structure at 1.54 GeV with a Gaussian width MeV in the missing mass of in the reaction . The observed structure may be due to the interference between a strange (or antistrange) baryon resonance in the system and the 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 -production-based background-only hypothesis corresponds to .
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