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We study the exclusive double-photon annihilation processes, e+e- → γγ* → γV0 and e+e- → γ*γ* → V[0 over a]V[0 over b], where the V[0 over i] is a neutral vector meson produced in the forward kinematical region: s >>

We study the exclusive double-photon annihilation processes, e+e- → γγ* → γV0 and e+e- → γ*γ* → V[0 over a]V[0 over b], where the V[0 over i] is a neutral vector meson produced in the forward kinematical region: s >> −t and −t >> A[2 over QCD]. We show how the differential cross sections [dσ over dt], 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* → q[bar over q], these total cross sections and σ(e+e- → γV0) and σ(e+e- → V[0 over a]V[0 over b]), 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- → W-p+. 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.

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    Title
    • QCD Compositeness as Revealed in Exclusive Vector Boson Reactions Through Double-Photon Annihilation: e+e− → γγ⁎ → γV0 and e+e− → γ⁎γ⁎ → V0V0
    Date Created
    2016-11-17
    Resource Type
  • Text
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    Identifier
    • Digital object identifier: 10.1016/j.physletb.2016.11.009
    • Identifier Type
      International standard serial number
      Identifier Value
      0370-2693
    • Identifier Type
      International standard serial number
      Identifier Value
      1873-2445
    Note
    • The final version of this article, as published in Physics Letters B, can be viewed online at: http://www.sciencedirect.com/science/article/pii/S0370269316306700?via%3Dihub

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    Brodsky, S. J., Lebed, R. F., & Lyubovitskij, V. E. (2017). QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e e−→γγ⁎→γV0 and e e−→γ⁎γ⁎→V0V0. Physics Letters B, 764, 174-179. doi:10.1016/j.physletb.2016.11.009

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