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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

Abstract

We study the exclusive double-photon annihilation processes, e+e- →γγ* → γV0 and e+e- γ*γ* V$$0\atop{a}$$V$$0\atop{b}$$, where the V$$0\atop{i}$$ is a neutral vector meson produced in the forward kinematical region: s>> -t and -t >> Λ$$2\atop{QCD}$$. We show how the differential cross sections $$dσ\atop{dt}$$, 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*→ $$q\bar{q}$$, these total cross sections σ(e+e-→γV0)and σ(e+e-→V$$0\atop{a}$$V$$0\atop{b}$$), 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-→Z0V0and 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.

Authors:
; ;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
OSTI Identifier:
1332769
Alternate Identifier(s):
OSTI ID: 1327481
Report Number(s):
SLAC-PUB-16809
Journal ID: ISSN 0370-2693; S0370269316306700; PII: S0370269316306700
Grant/Contract Number:  
AC02-76SF00515
Resource Type:
Journal Article: Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 764 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Phenomenology-HEP; HEPPH

Citation Formats

Brodsky, Stanley J., Lebed, Richard F., and Lyubovitskij, Valery E. QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e+e−→γγ⁎→γV0 and e+e−→γ⁎γ⁎→V0V0. Netherlands: N. p., 2017. Web. doi:10.1016/j.physletb.2016.11.009.
Brodsky, Stanley J., Lebed, Richard F., & Lyubovitskij, Valery E. QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e+e−→γγ⁎→γV0 and e+e−→γ⁎γ⁎→V0V0. Netherlands. https://doi.org/10.1016/j.physletb.2016.11.009
Brodsky, Stanley J., Lebed, Richard F., and Lyubovitskij, Valery 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". Netherlands. https://doi.org/10.1016/j.physletb.2016.11.009.
@article{osti_1332769,
title = {QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e+e−→γγ⁎→γV0 and e+e−→γ⁎γ⁎→V0V0},
author = {Brodsky, Stanley J. and Lebed, Richard F. and Lyubovitskij, Valery E.},
abstractNote = {We study the exclusive double-photon annihilation processes, e+e- →γγ* → γV0 and e+e- γ*γ* V$0\atop{a}$V$0\atop{b}$, where the V$0\atop{i}$ is a neutral vector meson produced in the forward kinematical region: s>> -t and -t >> Λ$2\atop{QCD}$. We show how the differential cross sections $dσ\atop{dt}$, 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*→ $q\bar{q}$, these total cross sections σ(e+e-→γV0)and σ(e+e-→V$0\atop{a}$V$0\atop{b}$), 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-→Z0V0and 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.},
doi = {10.1016/j.physletb.2016.11.009},
url = {https://www.osti.gov/biblio/1332769}, journal = {Physics Letters B},
issn = {0370-2693},
number = C,
volume = 764,
place = {Netherlands},
year = {Sun Jan 01 00:00:00 EST 2017},
month = {Sun Jan 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1016/j.physletb.2016.11.009

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