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Diffractive Excitation in DIS and pp Collisions

Avsar, Emil LU ; Gustafson, Gösta LU and Lönnblad, Leif LU (2007) In Journal of High Energy Physics 0712(012).
Abstract
We have in earlier papers presented an extension of Mueller's dipole cascade model, which includes subleading effects from energy conservation and running coupling as well as colour suppressed effects from pomeron loops via a ``dipole swing''. The model was applied to describe the total cross sections in pp and gamma*p collisions. In this paper we present a number of improvements of the model, in particular related to the confinement mechanism. A consistent treatment of dipole evolution and dipole--dipole interactions is achieved by replacing the infinite range Coulomb potential by a screened potential, which further improves the frame-independence of the model. We then apply the model to elastic scattering and diffractive excitation,... (More)
We have in earlier papers presented an extension of Mueller's dipole cascade model, which includes subleading effects from energy conservation and running coupling as well as colour suppressed effects from pomeron loops via a ``dipole swing''. The model was applied to describe the total cross sections in pp and gamma*p collisions. In this paper we present a number of improvements of the model, in particular related to the confinement mechanism. A consistent treatment of dipole evolution and dipole--dipole interactions is achieved by replacing the infinite range Coulomb potential by a screened potential, which further improves the frame-independence of the model. We then apply the model to elastic scattering and diffractive excitation, where we specifically study the effects of different sources for fluctuations. In our formalism we can take into account contributions from all different sources, from the dipole cascade evolution, the dipole--dipole scattering, from the impact-parameter dependence, and from the initial photon and proton wavefunctions. Good agreement is obtained with data from the Tevatron and from HERA, and we also present some predictions for the LHC. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Small-x physics, Diffraction, DIS., Dipole Model, Saturation
in
Journal of High Energy Physics
volume
0712
issue
012
publisher
Springer
external identifiers
  • wos:000252246500012
  • scopus:38049064383
ISSN
1126-6708
DOI
10.1088/1126-6708/2007/12/012
language
English
LU publication?
yes
id
5e83b123-36a2-454d-8fb6-b72e24ec2120 (old id 619364)
date added to LUP
2007-12-18 11:55:52
date last changed
2017-08-20 04:40:05
@article{5e83b123-36a2-454d-8fb6-b72e24ec2120,
  abstract     = {We have in earlier papers presented an extension of Mueller's dipole cascade model, which includes subleading effects from energy conservation and running coupling as well as colour suppressed effects from pomeron loops via a ``dipole swing''. The model was applied to describe the total cross sections in pp and gamma*p collisions. In this paper we present a number of improvements of the model, in particular related to the confinement mechanism. A consistent treatment of dipole evolution and dipole--dipole interactions is achieved by replacing the infinite range Coulomb potential by a screened potential, which further improves the frame-independence of the model. We then apply the model to elastic scattering and diffractive excitation, where we specifically study the effects of different sources for fluctuations. In our formalism we can take into account contributions from all different sources, from the dipole cascade evolution, the dipole--dipole scattering, from the impact-parameter dependence, and from the initial photon and proton wavefunctions. Good agreement is obtained with data from the Tevatron and from HERA, and we also present some predictions for the LHC.},
  author       = {Avsar, Emil and Gustafson, Gösta and Lönnblad, Leif},
  issn         = {1126-6708},
  keyword      = {Small-x physics,Diffraction,DIS.,Dipole Model,Saturation},
  language     = {eng},
  number       = {012},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Diffractive Excitation in DIS and pp Collisions},
  url          = {http://dx.doi.org/10.1088/1126-6708/2007/12/012},
  volume       = {0712},
  year         = {2007},
}