Study of color-octet matrix elements through $$J/\psi $$ J / ψ production in $$e^{+}e^{-}$$ e + e - annihilation
نویسندگان
چکیده
منابع مشابه
Signature for Color-Octet Production of J/ψ in e + e − Annihilation
The inclusive cross section for the production of J/ψ in e+e− annihilation is studied using a recently developed factorization formalism. In addition to the conventional color-singlet contribution, we include contributions from cc̄ pairs that are produced at short distances in color-octet states. The color-octet contributions are suppressed by the smaller probability for the color-octet cc̄ pair ...
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J/ψ production associated with a hard photon in ee annihilation, being of QED nature, is invastigated thoroughly in the paper. To show its influence on the observation of the color-octet singnature in the ee annihilation via J/ψ inclusive production, the cross sections of the J/ψ productions through different mechanisms at various energies are compared quantatively by presenting them in figures...
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Electromagnetic production of J/ψ at ee colliders is investigated. It is expected to be as a further test of charmonium production of QED nature. We find that at the energies of CESR, BEPC, and TRISTAN (e.g. 4.0GeV ≤ √s ≤ 60GeV ), the contributions of the concerned electromagnetic processes to the J/ψ inclusive production are great, even dominant, thus they greatly effect the observation on the...
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The direct production rate of ψ in the Υ decay is shown to be dominated by the process Υ → ggg followed by g → ψ via the color-octet mechanism proposed recently to explain the anomalous prompt charmonium production at the Tevatron. We show that this plausibly dominant process has a branching ratio compatible with the experimental data. Further experimental study in this channel is important to ...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2017
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-017-5120-2