Quarkonium chromo-polarizability from the decays J/ψ(Υ) → ππℓ+-

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It is pointed out that the diagonal amplitude of the E1-E1 chromo-electric interaction with soft gluon fields (chromo-polarizability) can be measured directly for the J/ψ and Υ resonances in the decays J/ψ → ππℓ+- and Υ → ππℓ +- with soft pions. For the J/ψ this amplitude is often discussed in connection with the J/ψ interaction with nuclear matter, while for the Υ the chromo-polarizability enters the estimates of the nonperturbative mass shift of the resonance relevant to precision determination of the b quark mass from the Υ mass.

Original languageEnglish (US)
Pages (from-to)665-670
Number of pages6
JournalModern Physics Letters A
Issue number9
StatePublished - Mar 21 2004

Bibliographical note

Funding Information:
This work is supported in part by the DOE grant DE-FG02-94ER40823.


  • Heavy quarkonia
  • Nonperturbative QCD
  • Soft pions


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