TITLE

Discovery of a narrow resonance state of the system K[sub S]K[sub S] at mass 1520 MeV

AUTHOR(S)
Barkov, B. P.; Vladimirskiı, V. V.; Grigor’ev, V. K.; Erofeeva, O. N.; Katinov, Yu. V.; Korol’kov, I. Ya.; Lisin, V. I.; Luzin, V. N.; Nozdrachev, V. N.; Sokolovskiı, V. V.; Tikhomirov, G. D.; Uzunyan, S. A.; Shkurenko, Yu. P.; Gridnev, I. A.
PUB. DATE
August 1999
SOURCE
JETP Letters;8/25/99, Vol. 70 Issue 4, p248
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Data are presented which indicate the existence of a previously unknown narrow resonance near mass 1520 MeV, discovered while analyzing the system K[sub S]K[sub 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[sup -]p and K[sup -] 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[sub S]K[sub S]) give ∼5.0 nb in π[sup -] p interactions and ∼250 nb in K[sup -] p interactions. From the fact that the production cross section of this resonance in the K[sup -] beam is approximately 50 times greater than the production cross section in the π[sup -] beam, it can be concluded that this new state belongs to a system of mesons with hidden strangeness.
ACCESSION #
7321441

 

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