Transverse momentum dependent gluon fragmentation functions from $$J/\psi \ \pi $$ J / ψ π production at $$e^+ e^-$$ e + e - colliders

J/ψ Electromagnetic Production at e+e− Colliders

Within the framework of QED we investigate the inclusive J/ψ production at ee colliders. It is expected to be as a further test to the charmonium production mechanisms and QED. 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 greatl...

J / ψ production through resolved photon processes at e + e − colliders

Electromagnetic Production of J/ψ at e+e− colliders and the Signature for Color-Octet

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...

2 00 4 Measurement of σ ( e + e − → π + π − ) at e + e − Colliders

At the DAΦNE-II workshop a session was devoted to the prospects of measuring the hadronic cross section at the new DAΦNE. The session included six papers, two theoretical and four experimental ones. The theory treatises, one on the muon anomaly and the other on measuring the hadronic cross section using initial state radiation at e + e − colliders, set the background for the four experimental d...

hep-ph/0401246 Inclusive J/ψ Productions at e + e − Colliders

Inclusive J/ψ productions in e + e − annihilation is studied in the framework of NRQCD. We first review the leading-order calculations of the cross sections for e + e − → J/ψc¯ c and e + e − → J/ψgg and find that their ratio is about 1:1.5 at √ s ≃ 10 GeV. This result is in conflict with the current measurements by the Belle Collaboration, which finds that the process e + e − → J/ψc¯ c accounts...