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Correlations in double parton distributions at small x

Flensburg, Christoffer LU ; Gustafson, Gösta LU ; Lönnblad, Leif LU and Ster, Andras (2011) In Journal of High Energy Physics 2011(6). p.1-21
Abstract
We present a dynamical study of the double parton distribution in impact parameter space, which enters into the double scattering cross section in hadronic collisions. This distribution is analogous to the generalized parton densities in momentum space. We use the Lund Dipole Cascade model, presented in earlier articles, which is based on BFKL evolution including essential higher order corrections and saturation effects. As result we find large correlation effects, which break the factorization of the double scattering process. At small transverse separation we see the development of “hot spots”, which become stronger with increasing Q 2 . At smaller x -values the distribution widens, consistent with the shrinking of the diffractive peak... (More)
We present a dynamical study of the double parton distribution in impact parameter space, which enters into the double scattering cross section in hadronic collisions. This distribution is analogous to the generalized parton densities in momentum space. We use the Lund Dipole Cascade model, presented in earlier articles, which is based on BFKL evolution including essential higher order corrections and saturation effects. As result we find large correlation effects, which break the factorization of the double scattering process. At small transverse separation we see the development of “hot spots”, which become stronger with increasing Q 2 . At smaller x -values the distribution widens, consistent with the shrinking of the diffractive peak in elastic scattering. The dependence on Q 2 is, however, significantly stronger than the dependence on x , which has implications for extrapolations to LHC, e.g. for results for underlying events associated with the production of new heavy particles. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
QCD, Jets, Parton Model, Phenomenological Models
in
Journal of High Energy Physics
volume
2011
issue
6
pages
1 - 21
publisher
Springer
external identifiers
  • wos:000293136500066
  • scopus:80053157396
ISSN
1126-6708
DOI
10.1007/JHEP06(2011)066
language
English
LU publication?
yes
id
547a159b-8237-428a-9e96-7e3604c5adcb (old id 2117828)
date added to LUP
2011-08-29 16:12:40
date last changed
2017-03-12 03:11:29
@article{547a159b-8237-428a-9e96-7e3604c5adcb,
  abstract     = {We present a dynamical study of the double parton distribution in impact parameter space, which enters into the double scattering cross section in hadronic collisions. This distribution is analogous to the generalized parton densities in momentum space. We use the Lund Dipole Cascade model, presented in earlier articles, which is based on BFKL evolution including essential higher order corrections and saturation effects. As result we find large correlation effects, which break the factorization of the double scattering process. At small transverse separation we see the development of “hot spots”, which become stronger with increasing Q 2 . At smaller x -values the distribution widens, consistent with the shrinking of the diffractive peak in elastic scattering. The dependence on Q 2 is, however, significantly stronger than the dependence on x , which has implications for extrapolations to LHC, e.g. for results for underlying events associated with the production of new heavy particles.},
  author       = {Flensburg, Christoffer and Gustafson, Gösta and Lönnblad, Leif and Ster, Andras},
  issn         = {1126-6708},
  keyword      = {QCD,Jets,Parton Model,Phenomenological Models},
  language     = {eng},
  number       = {6},
  pages        = {1--21},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Correlations in double parton distributions at small x},
  url          = {http://dx.doi.org/10.1007/JHEP06(2011)066},
  volume       = {2011},
  year         = {2011},
}