Quarkonium Formation Time in a Model-Independent Approach

Details Quarkonium Formation Time in a Model-Independent Approach Quarkonium Formation Time in a Model-Independent Approach

1999-07-06

arxiv.org/abs/nucl-th/9907021v1

Phys.Rev. C60 (1999) 041901

Physics

Nuclear Physics

Nuclear Theory

10 pages with 3 figures

Scientific paper

10.1103/PhysRevC.60.041901

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.

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