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Dijet cross sections and parton densities in diffractive DIS at HERA

Aktas, A.; Hansson, Magnus LU ; Jönsson, Leif LU ; Knutsson, Albert LU and Osman, Sakar (2007) In Journal of High Energy Physics 10.
Abstract
Differential dijet cross sections in diffractive deep-inelastic scattering are measured with the H1 detector at HERA using an integrated luminosity of 51.5 pb-1. The selected events are of the type ep → eXY, where the system X contains at least two jets and is well separated in rapidity from the low mass proton dissociation system Y. The dijet data are compared with QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from measurements of inclusive diffractive deep-inelastic scattering. The prediction describes the dijet data well at low and intermediate zIP (the fraction of the momentum of the diffractive exchange carried by the parton entering the hard interaction) where the... (More)
Differential dijet cross sections in diffractive deep-inelastic scattering are measured with the H1 detector at HERA using an integrated luminosity of 51.5 pb-1. The selected events are of the type ep → eXY, where the system X contains at least two jets and is well separated in rapidity from the low mass proton dissociation system Y. The dijet data are compared with QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from measurements of inclusive diffractive deep-inelastic scattering. The prediction describes the dijet data well at low and intermediate zIP (the fraction of the momentum of the diffractive exchange carried by the parton entering the hard interaction) where the gluon density is well determined from the inclusive diffractive data, supporting QCD factorisation. A new set of diffractive parton distribution functions is obtained through a simultaneous fit to the diffractive inclusive and dijet cross sections. This allows for a precise determination of both the diffractive quark and gluon distributions in the range 0.05 < zIP < 0.9. In particular, the precision on the gluon density at high momentum fractions is improved compared to previous extractions. (Less)
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type
Contribution to journal
publication status
published
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in
Journal of High Energy Physics
volume
10
publisher
Springer
external identifiers
  • WOS:000250759700069
  • Scopus:81755173890
ISSN
1126-6708
DOI
10.1088/1126-6708/2007/10/042
language
English
LU publication?
yes
id
959600fa-825f-4767-8905-3ace0ae84fa7 (old id 798442)
date added to LUP
2007-12-28 12:02:25
date last changed
2017-01-01 07:56:26
@article{959600fa-825f-4767-8905-3ace0ae84fa7,
  abstract     = {Differential dijet cross sections in diffractive deep-inelastic scattering are measured with the H1 detector at HERA using an integrated luminosity of 51.5 pb-1. The selected events are of the type ep → eXY, where the system X contains at least two jets and is well separated in rapidity from the low mass proton dissociation system Y. The dijet data are compared with QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from measurements of inclusive diffractive deep-inelastic scattering. The prediction describes the dijet data well at low and intermediate zIP (the fraction of the momentum of the diffractive exchange carried by the parton entering the hard interaction) where the gluon density is well determined from the inclusive diffractive data, supporting QCD factorisation. A new set of diffractive parton distribution functions is obtained through a simultaneous fit to the diffractive inclusive and dijet cross sections. This allows for a precise determination of both the diffractive quark and gluon distributions in the range 0.05 &lt; zIP &lt; 0.9. In particular, the precision on the gluon density at high momentum fractions is improved compared to previous extractions.},
  articleno    = {42},
  author       = {Aktas, A. and Hansson, Magnus and Jönsson, Leif and Knutsson, Albert and Osman, Sakar},
  issn         = {1126-6708},
  language     = {eng},
  publisher    = {Springer},
  series       = {Journal of High Energy Physics},
  title        = {Dijet cross sections and parton densities in diffractive DIS at HERA},
  url          = {http://dx.doi.org/10.1088/1126-6708/2007/10/042},
  volume       = {10},
  year         = {2007},
}