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Title: Unifying “soft” and “hard” diffractive exclusive vector meson production and deeply virtual Compton scattering

Authors:
; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL)
Sponsoring Org.:
USDOE SC OFFICE OF NUCLEAR PHYSICS
OSTI Identifier:
1159714
Report Number(s):
BNL-106139-2014-JA
R&D Project: PO-001; KB0101022
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review D; Journal Volume: 90; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; vector meson; Compton; Pomeron

Citation Formats

Fazio S., Firoe, R., Jenkovsky, L., and Salii, A. Unifying “soft” and “hard” diffractive exclusive vector meson production and deeply virtual Compton scattering. United States: N. p., 2014. Web. doi:10.1103/PhysRevD.90.016007.
Fazio S., Firoe, R., Jenkovsky, L., & Salii, A. Unifying “soft” and “hard” diffractive exclusive vector meson production and deeply virtual Compton scattering. United States. doi:10.1103/PhysRevD.90.016007.
Fazio S., Firoe, R., Jenkovsky, L., and Salii, A. Thu . "Unifying “soft” and “hard” diffractive exclusive vector meson production and deeply virtual Compton scattering". United States. doi:10.1103/PhysRevD.90.016007.
@article{osti_1159714,
title = {Unifying “soft” and “hard” diffractive exclusive vector meson production and deeply virtual Compton scattering},
author = {Fazio S. and Firoe, R. and Jenkovsky, L. and Salii, A.},
abstractNote = {},
doi = {10.1103/PhysRevD.90.016007},
journal = {Physical Review D},
number = 1,
volume = 90,
place = {United States},
year = {Thu Jul 10 00:00:00 EDT 2014},
month = {Thu Jul 10 00:00:00 EDT 2014}
}
  • In this work we estimate the differential cross section for the high energy deeply virtual Compton scattering on a photon target, {gamma}*{gamma}{yields}{gamma}{gamma}, within the QCD dipole-dipole scattering formalism. For the phenomenology, a saturation model for the dipole-dipole cross section for two photon scattering is considered. Its robustness is supported by a good description of current accelerator data. In addition, we consider the related exclusive vector meson production processes, {gamma}*{gamma}{yields}V{gamma}. This analysis is focused on the light {rho} and {phi} meson production, which produces larger cross sections. The phenomenological results are compared with the theoretical calculation using the color-dipole Balitsky-Fadin-Kuraev-Lipatov approach.
  • We calculate the nuclear cross section for coherent and incoherent deep virtual Compton scattering as well as for coherent and incoherent vector meson production for the mesons J/{Psi}, {phi} and {rho} within the QCD color dipole picture, including saturation effects. Theoretical estimates for scattering on both light and heavy nuclei are given over a wide range of energy.
  • Recently dispersion relations have been applied to hard exclusive processes such as deeply virtual Compton scattering, and a holographic principle was proposed that maps out the generalized parton distributions entering the soft matrix elements for the processes from their values on a given kinematical ridge. We examine possible pitfalls associated with the implicit, direct identification in this approach of the physical hadronic states with colored partons, and suggest an improved treatment of this assumption.
  • We consider Deeply Virtual Compton Scattering (DVCS) on nucleons and nuclei in the framework of generalized vector meson dominance (GVMD) model. We demonstrate that the GVMD model provides a good description of the HERA data on the dependence of the proton DVCS cross section on $Q^2$, $W$ (at $Q^2=4$ GeV$^2$) and $t$. At $Q^2 = 8$ GeV$^2$, the soft $W$-behavior of the GVMD model somewhat underestimates the $W$-dependence of the DVCS cross section due to the hard contribution not present in the GVMD model. We estimate $1/Q^2$ power-suppressed corrections to the DVCS amplitude and the DVCS cross section and findmore » them large. We also make predictions for the nuclear DVCS amplitude and cross section in the kinematics of the future Electron-Ion Collider. We predict significant nuclear shadowing, which matches well predictions of the leading-twist nuclear shadowing in DIS on nuclei.« less