Abstract
A short review of current upgrades of the PHOKHARA and EKHARA generators is presented together with a report on the work in progress. The upgrades are based on a newly constructed model of the χci − γ* − γ* and χci − J/ψ* − γ* form factors. Within this model predictions were made for the electronic widths of χc1 and χc2 and, based on the event generators results, cross sections e+e− → χc1 (→ J/ψ(→ μ+μ−)γ), e+e−→ e+e−χc1 and e+e−→ e+e−χc1 (→ J/ψ(→ μ+μ−)γ).
Highlights
The event generators PHOKHARA and EKHARA were developed to help measurements of the e+e− → hadrons + photons and e+e− → e+e− + hadrons cross sections
In [19] a new model of the η(η ) − γ∗ − γ∗ form factors was developed to give predictions in agreement with experimental data. In this proceedings we report on the latest progress on the upgrades of both event generators EKHARA and PHOKHARA
With the single tag events, when the final electron momenta is measured, it will allow to cover the range of the χci −γ∗−γ∗ transition form factor up to about −25 GeV2 for one of the invariants [21]
Summary
The event generators PHOKHARA and EKHARA were developed to help measurements of the e+e− → hadrons + photons and e+e− → e+e− + hadrons cross sections. In the same time models of hadron-photon interactions were developed and radiative corrections calculated and implemented into the event generator PHOKHARA to guarantee the physical accuracy at the level required by the experimental groups. In [19] a new model of the η(η ) − γ∗ − γ∗ form factors was developed to give predictions in agreement with experimental data In this proceedings we report on the latest progress on the upgrades of both event generators EKHARA and PHOKHARA. The non-reducible background for the χc and χc production in the reactions e+e− → χci(→ J/ψ(→ μ+μ−)γ), i = 1, 2 is the J/ψ production in radiative return with its subsequent decay to μ+μ− This was discussed in [20], where it was shown that within the model developed there the main effect comes from the interference between the background and signal diagrams.
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