Geometric scaling and QCD dynamics in DIS
(2007) In Journal of High Energy Physics p.2525 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)nonordered (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)nonordered (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)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/1416180
 author
 Avsar, Emil ^{LU} and Gustafson, Gösta ^{LU}
 organization
 publishing date
 2007
 type
 Contribution to journal
 publication status
 published
 subject
 keywords
 PROTON STRUCTURE, HIGHENERGY, BFKL POMERON, STATISTICAL PHYSICS, phenomenological models, PICTURE, EVOLUTION, UNITARITY, COHERENCE, SCATTERING, SMALLX, deep inelastic scattering, QCD
 in
 Journal of High Energy Physics
 issue
 4
 pages
 25  25
 publisher
 Springer
 external identifiers

 wos:000246396400067
 scopus:34247885986
 ISSN
 11266708
 DOI
 10.1088/11266708/2007/04/067
 language
 English
 LU publication?
 yes
 id
 987a6b034d944887b568aff685eaace8 (old id 1416180)
 date added to LUP
 20090617 10:45:36
 date last changed
 20180107 06:27:31
@article{987a6b034d944887b568aff685eaace8, 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)nonordered (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.}, author = {Avsar, Emil and Gustafson, Gösta}, issn = {11266708}, keyword = {PROTON STRUCTURE,HIGHENERGY,BFKL POMERON,STATISTICAL PHYSICS,phenomenological models,PICTURE,EVOLUTION,UNITARITY,COHERENCE,SCATTERING,SMALLX,deep inelastic scattering,QCD}, language = {eng}, number = {4}, pages = {2525}, publisher = {Springer}, series = {Journal of High Energy Physics}, title = {Geometric scaling and QCD dynamics in DIS}, url = {http://dx.doi.org/10.1088/11266708/2007/04/067}, year = {2007}, }