QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e+e → γγ → γV0 and e+e → γγ → V0V0

Stanley J. Brodsky, Richard Lebed, Valery E. Lyubovitskij

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We study the exclusive double-photon annihilation processes, e+e→γγ→γV0 and e+e→γγ→Va 0Vb 0, where the Vi 0 is a neutral vector meson produced in the forward kinematical region: s≫−t and −t≫ΛQCD 2. We show how the differential cross sections dσdt, as predicted by QCD, have additional falloff in the momentum transfer squared t due to the QCD compositeness of the hadrons, consistent with the leading-twist fixed-θCM scaling laws, both in terms of conventional Feynman diagrams and by using the AdS/QCD holographic model to obtain the results more transparently. However, even though they are exclusive channels and not associated with the conventional electron–positron annihilation process e+e→γ→qq¯, these total cross sections σ(e+e→γV0) and σ(e+e→Va 0Vb 0), integrated over the dominant forward- and backward-θCM angular domains, scale as 1/s, and thus contribute to the leading-twist scaling behavior of the ratio Re+e . We generalize these results to exclusive double-electroweak vector-boson annihilation processes accompanied by the forward production of hadrons, such as e+e→Z0V0 and e+e→Wρ+. These results can also be applied to the exclusive production of exotic hadrons such as tetraquarks, where the cross-section scaling behavior can reveal their multiquark nature.

Original languageEnglish (US)
Pages (from-to)174-179
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
StatePublished - Jan 10 2017


  • Electron–positron annihilation
  • Electroweak bosons
  • Hadron structure
  • Quantum chromodynamics
  • Tetraquarks
  • Vector meson dominance

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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