E-catalog        

Библиогр.: 21 назв.

We study the exclusive double-photon annihilation processes, e+e−→γγ∗→γV0 and e+e−→γ∗γ∗→V0aV0b, where the V0i is a neutral vector meson produced in the forward kinematical region: s≫−t and −t≫Λ2QCD. 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. 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−→V0aV0b), 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−ρ+. 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.