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

doi:10.1016/j.physletb.2016.11.009

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QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e + e− → γγ∗ → γV0 and e + e− → γ∗ γ∗ → V0V0	455 KB	Adobe Acrobat PDF	Read	Download
DOI Доступ к ресурсу на сайте издателя			10.1016/j.physletb.2016.11.009

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#двухфотонная аннигиляция

Title: QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e+ e− → γγ∗ → γV0 and e+ e− → γ∗ γ∗ → V0V0
Creator: Brodsky, Stanley J.
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Lebed, Richard F.
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Lyubovitskij, Valery E.
Date: 2017
DOI: 10.1016/j.physletb.2016.11.009
Description: 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.

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collection(s): Физический факультет
Identifier: смотреть в электронном каталоге НБ ТГУ
Type: статьи в журналах
Source: Physics Letters B. 2017. Vol. 764. P. 174-179
Language: eng

Created: 20-10-2017

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