Journal
PHYSICAL REVIEW D
Volume 91, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.91.036004
Keywords
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Funding
- DFG
- NSFC [CRC 110]
- project Study of Strongly Interacting Matter (HadronPhysics3) under the 7th Framework Program of the EU [283286]
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In view of the first measurement of the branching fraction for J/Psi -> pi(0)e(+)e(-) by the BESIII collaboration, we analyze what can be learned on the corresponding transition form factor using dispersion theory. We show that light-quark degrees of freedom dominate the spectral function, in particular two-pion intermediate states. Estimating the effects of multipion states as well as charmonium, we arrive at a prediction for the complete form factor that should be scrutinized experimentally in the future.
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