Discovery of a narrow resonance state of the system K
S
K
S
at mass 1520 MeV |
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Authors: | B P Barkov V V Vladimirskii V K Grigor’ev O N Erofeeva Yu V Katinov I Ya Korol’kov V I Lisin V N Luzin V N Nozdrachev V V Sokolovskii G D Tikhomirov S A Uzunyan Yu P Shkurenko I A Gridnev |
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Institution: | (1) Institute of Theoretical and Experimental Physics, 117259 Moscow, Russia;(2) Moscow Engineering Physics Institute, 141700 Dolgoprudnyi, Moscow Region, Russia |
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Abstract: | Data are presented which indicate the existence of a previously unknown narrow resonance near mass 1520 MeV, discovered while
analyzing the system K
S
K
S
. The data were obtained at ITEP using the 6-m magnetic spectrometer in a beam of 40-GeV negative particles. The resonance
is observed in π−
p and K
−
p interactions with a total statistical confidence of not less than 5 standard deviations. The width of this state is comparable
to the mass resolution of the spectrometer (∼5 MeV). The mass is 1521.5±2.5 MeV. Estimates of the product σ·BR (K
S
K
S
) give ∼5.0 nb in π−
p interactions and ∼250 nb in K
−
p interactions. From the fact that the production cross section of this resonance in the K
− beam is approximately 50 times greater than the production cross section in the π− beam, it can be concluded that this new state belongs to a system of mesons with hidden strangeness.
Pis’ma Zh. éksp. Teor. Fiz. 70, No. 4, 242–246 (25 August 1999) |
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Keywords: | |
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