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Geometric scaling and QCD dynamics in DIS

Avsar, Emil LU and Gustafson, Gösta LU (2007) In Journal of High Energy Physics p.25-25
Abstract
DIS data from HERA show a striking regularity as sigma(gamma*p) is a function of the ratio tau = Q(2)/Q(s)(2)(x) only. The scaling function shows a break at 7 t, which has been taken as an indication for saturation. However, besides saturation also the transition between dominance of k(perpendicular to)-ordered (DGLAP) and k(perpendicular to)-non-ordered (BFKL) evolution contributes to a break around this value of 7, as well as the suppression for small Q(2) due to finite quark masses and confinement. In this paper we use a dipole cascade model based on Mueller's dipole model, which also includes energy conservation and pomeron mergings, to investigate the contributions of these different effects to the scaling behaviour. As a result we... (More)
DIS data from HERA show a striking regularity as sigma(gamma*p) is a function of the ratio tau = Q(2)/Q(s)(2)(x) only. The scaling function shows a break at 7 t, which has been taken as an indication for saturation. However, besides saturation also the transition between dominance of k(perpendicular to)-ordered (DGLAP) and k(perpendicular to)-non-ordered (BFKL) evolution contributes to a break around this value of 7, as well as the suppression for small Q(2) due to finite quark masses and confinement. In this paper we use a dipole cascade model based on Mueller's dipole model, which also includes energy conservation and pomeron mergings, to investigate the contributions of these different effects to the scaling behaviour. As a result we predict that the scaling function for tau < 1 will be modified when data for Q(2) > 1 GeV2 become available. We also investigate the scaling properties of the charm contribution and the impact parameter dependence of the saturation scale. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
keywords
PROTON STRUCTURE, HIGH-ENERGY, BFKL POMERON, STATISTICAL PHYSICS, phenomenological models, PICTURE, EVOLUTION, UNITARITY, COHERENCE, SCATTERING, SMALL-X, deep inelastic scattering, QCD
in
Journal of High Energy Physics
issue
4
pages
25 - 25
publisher
Springer
external identifiers
  • wos:000246396400067
  • scopus:34247885986
ISSN
1126-6708
DOI
10.1088/1126-6708/2007/04/067
language
English
LU publication?
yes
id
987a6b03-4d94-4887-b568-aff685eaace8 (old id 1416180)
date added to LUP
2009-06-17 10:45:36
date last changed
2017-01-01 05:19:39
@article{987a6b03-4d94-4887-b568-aff685eaace8,
  abstract     = {DIS data from HERA show a striking regularity as sigma(gamma*p) is a function of the ratio tau = Q(2)/Q(s)(2)(x) only. The scaling function shows a break at 7 t, which has been taken as an indication for saturation. However, besides saturation also the transition between dominance of k(perpendicular to)-ordered (DGLAP) and k(perpendicular to)-non-ordered (BFKL) evolution contributes to a break around this value of 7, as well as the suppression for small Q(2) due to finite quark masses and confinement. In this paper we use a dipole cascade model based on Mueller's dipole model, which also includes energy conservation and pomeron mergings, to investigate the contributions of these different effects to the scaling behaviour. As a result we predict that the scaling function for tau &lt; 1 will be modified when data for Q(2) &gt; 1 GeV2 become available. We also investigate the scaling properties of the charm contribution and the impact parameter dependence of the saturation scale.},
  author       = {Avsar, Emil and Gustafson, Gösta},
  issn         = {1126-6708},
  keyword      = {PROTON STRUCTURE,HIGH-ENERGY,BFKL POMERON,STATISTICAL PHYSICS,phenomenological models,PICTURE,EVOLUTION,UNITARITY,COHERENCE,SCATTERING,SMALL-X,deep inelastic scattering,QCD},
  language     = {eng},
  number       = {4},
  pages        = {25--25},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Geometric scaling and QCD dynamics in DIS},
  url          = {http://dx.doi.org/10.1088/1126-6708/2007/04/067},
  year         = {2007},
}