منابع مشابه
Resonances from J / Ψ and Ψ ′ Decays
The Institute of High Energy Physics at Beijing runs an electron-positron collider (BEPC) with a general purpose solenoidal detector, the Beijing Spectrometer (BES)[1], which is designed to study exclusive final states in ee annihilations at the center of mass energy from 3000 to 5600 MeV. In this energy range, the largest cross sections are at the J/Ψ(3097) and Ψ(3686) resonant peaks. At prese...
متن کاملN * and Meson Resonances in J/ψ Decays *
Over sixty million J/ψ events have been collected by the BES Collaboration at the Beijing Electron-Positron Collider (BEPC). J/ψ decays provide an excellent place for studying excited nucleons and hyperons – N, Λ, Σ and Ξ resonances, as well as meson resonances, including possible glueballs and hybrids. Physics objectives, recent results and future prospects of light hadron spectroscopy at BEPC...
متن کاملRecent N Results From J/ψ Decays
Based on 7.8 million J/ψ events collected at BEPC, the events for J/ψ → pp̄π and pp̄η have been selected and reconstructed. Clear peaks are observed around 1480 MeV in pπ(p̄π) invariant mass spectrum and near the threshold for η production in pη(p̄η) invariant mass spectrum. A partial wave analysis of J/ψ → pp̄η data has been performed. Two J = 1 2 − resonances are observed with mass and width (M, Γ...
متن کاملCharmonium Decays of Y (4260), ψ(4160), and ψ(4040)
Using data collected with the CLEO detector operating at the CESR e+e− collider at √ s = 3.974.26GeV, we investigate 15 charmonium decay modes of the ψ(4040), ψ(4160), and Y (4260) resonances. We confirm, at 11σ significance, the BaBar Y (4260)→ π+π−J/ψ discovery, make the first observation of Y (4260) → π0π0J/ψ (5.1σ), and find the first evidence for Y (4260) → K+K−J/ψ (3.7σ). We measure e+e− ...
متن کاملExclusive J/ψ and ψ′ decays into baryon-antibaryon pairs
Within a perturbative approach we investigate decays of charmonium states into baryon-antibaryon pairs. Using a recently proposed wave function for the nucleon and suitable generalizations of it to the hyperons and decouplet baryons, we obtain the decay widths for the BB channels in reasonable agreement with data. An important difference to previous work is the use of the c-quark mass in the pe...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 2001
ISSN: 0375-9474
DOI: 10.1016/s0375-9474(01)00433-x