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Author Achasov, N. N. ♦ Kiselev, A. V. ♦ Kozhevnikov, A. A. ♦ Shestakov, G. N.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ♦ ANNIHILATION ♦ BRANCHING RATIO ♦ ELECTRON-POSITRON COLLISIONS ♦ -980 MESONS ♦ FORECASTING ♦ GLUONS ♦ INTERFERENCE ♦ INTERMEDIATE STATE ♦ MESON FACTORIES ♦ PARTICLE PRODUCTION ♦ PSEUDOSCALAR MESONS ♦ PSEUDOSCALARS ♦ QUARKONIUM ♦ RESONANCE PARTICLES ♦ SEMILEPTONIC DECAY ♦ UNITARITY
Abstract Problems proposed by the present authors for studies at c-τ, b, super-c-τ, and super-b factories are formulated. First, a comparison of the mechanisms of light-scalar-meson production in the process D{sub s}{sup +}→ss̄e{sup +}ν→[σ(600)+f{sub 0}(980)]e{sup +}ν→π{sup +}π{sup −}e{sup +}ν with the mechanisms of light-pseudoscalar-meson production in the process D{sub s}{sup +}→ss̄e{sup +}ν→(η/η{sup ′})e{sup +}ν reveals that the transition ss̄→σ(600) is negligible in relation to the transition ss̄→f{sub 0}(980). As for f{sub 0}(980), ss̄→f{sub 0}(980) is not more than 30% of ss̄→η{sub s}(η{sub s}=ss̄). It is proposed to study light scalar mesons in the semileptonic decays of D{sup +}(D{sup −}) D{sup 0}(D̄{sup 0}), B{sup +}(B{sup −}), and B{sup 0}(B̄{sup 0}). Second, interference phenomena observed in the ψ(3770)-resonance region in the reaction e{sup +}e{sup −}→DD̄ are described on the basis of models satisfying the elastic-unitarity requirement. As a model, we propose the model of mixed ψ(3770) and ψ(2S) resonances. In order to select theoretical models, it is proposed to employ non-DD̄ decay channels such as e{sup +}e{sup −} → ψ(3770) → γχ{sub c0}, J/ψη, and ϕη. Third, branching ratios are calculated for ψ(3770) and ϒ(10580) decays proceeding to light (non-DD̄ and non-BB̄) hadrons owing to the contributions of real DD̄ and BB̄ intermediate states. The predictions obtained for these branching ratios lie in the range of 1% ≲ BR ≲ 15%. The lower boundary of this range is ten times higher than the branching ratio for annihilation to three gluons.
ISSN 10637788
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-05-15
Publisher Place United States
Journal Physics of Atomic Nuclei
Volume Number 78
Issue Number 3


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