Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5495383 | Physics Letters B | 2017 | 6 Pages |
Abstract
We study the exclusive double-photon annihilation processes, e+eââγγââγV0 and e+eââγâγââVa0Vb0, where the Vi0 is a neutral vector meson produced in the forward kinematical region: sâ«ât and âtâ«ÎQCD2. We show how the differential cross sections dÏdt, 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+eââγââqq¯, these total cross sections Ï(e+eââγV0) and Ï(e+eââVa0Vb0), 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+eâ. We generalize these results to exclusive double-electroweak vector-boson annihilation processes accompanied by the forward production of hadrons, such as e+eââZ0V0 and e+eââWâÏ+. 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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Stanley J. Brodsky, Richard F. Lebed, Valery E. Lyubovitskij,