Method to measure quarkonium wave function using Bc decay
Abstract
We propose a method that enables a direct experimental probe of the quarkonium wave function defined in potential nonrelativistic QCD (pNRQCD) using the three-body decay of the Bc meson. We show that the momentum distribution of the spectator c-quark in the partonic decay is proportional to the absolute square of the momentum-space wave function of the Bc state. It would provide, for the first time, an experimentally accessible probe of the quarkonium wave function.
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