Quarkonium formation time in a model independent approach
Jul, 1999Citations per year
Abstract:
We use dispersion relations to reconstruct, in a model-independent way, the formation dynamics of heavy quarkonium from the experimental data on e+ e- annihilation to Q-bar Q. We extract a distribution of formation times with a mean value for the J/psi, tau{J/psi} = 0.44 fm; and for the Upsilon, tau{Upsilon} = 0.32 fm. The corresponding widths of these distributions are given by Delta-tau{J/psi} = 0.31 fm and Delta-tau{Upsilon} = 0.28 fm. This information can be used as an input in modeling of heavy quarkonium production on nuclear targets.Note:
- 10 pages with 3 figures
- electron positron: annihilation
- quarkonium: electroproduction
- bottomonium
- charmonium
- J/psi(3100)
- Upsilon(9460)
- time dependence
- two-point function
- numerical calculations
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