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 F. Lebed, Valery E. Lyubovitskij

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

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
Pages (from-to)174-179
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume764
DOIs
Publication statusPublished - 10 Jan 2017

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hadrons
bosons
quantum chromodynamics
cross sections
photons
scaling
Feynman diagrams
vector mesons
scaling laws
momentum transfer

Keywords

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

@article{8068a0816b094884a22a5dfc53a5e607,
title = "QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e+e− → γγ⁎ → γV0 and e+e− → γ⁎γ⁎ → V0V0",
abstract = "We study the exclusive double-photon annihilation processes, e+e−→γγ⁎→γV0 and e+e−→γ⁎γ⁎→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−→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.",
keywords = "Electron–positron annihilation, Electroweak bosons, Hadron structure, Quantum chromodynamics, Tetraquarks, Vector meson dominance",
author = "Brodsky, {Stanley J.} and Lebed, {Richard F.} and Lyubovitskij, {Valery E.}",
year = "2017",
month = "1",
day = "10",
doi = "10.1016/j.physletb.2016.11.009",
language = "English",
volume = "764",
pages = "174--179",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",

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TY - JOUR

T1 - QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation

T2 - e+e− → γγ⁎ → γV0 and e+e− → γ⁎γ⁎ → V0V0

AU - Brodsky, Stanley J.

AU - Lebed, Richard F.

AU - Lyubovitskij, Valery E.

PY - 2017/1/10

Y1 - 2017/1/10

N2 - We study the exclusive double-photon annihilation processes, e+e−→γγ⁎→γV0 and e+e−→γ⁎γ⁎→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−→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.

AB - We study the exclusive double-photon annihilation processes, e+e−→γγ⁎→γV0 and e+e−→γ⁎γ⁎→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−→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.

KW - Electron–positron annihilation

KW - Electroweak bosons

KW - Hadron structure

KW - Quantum chromodynamics

KW - Tetraquarks

KW - Vector meson dominance

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U2 - 10.1016/j.physletb.2016.11.009

DO - 10.1016/j.physletb.2016.11.009

M3 - Article

VL - 764

SP - 174

EP - 179

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

ER -