Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-06-27
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages,4 figures Improved presentation; list of references reworked; qualitative estimate of the magnitude of different cont
Scientific paper
We study production of two pairs of jets in %hard hadron--hadron collisions in view of extracting contribution of {\em double hard interactions} of three and four partons ($3\to4$, $4\to4$). Such interactions, in spite of being power suppressed at the level of the total cross section, become comparable with the standard hard collisions of two partons, $2\to4$, in the {\em back-to-back kinematics} when the transverse momentum imbalances of two pairing jets are relatively small. We express differential and total cross sections for two-dijet production in double parton collisions through the generalized two-parton distributions, $_2$GPDs \cite{BDFS1}, that contain large-distance two-parton correlations of non-perturbative origin as well as small-distance correlations due to parton evolution. We find that these large- and small-distance correlations participate in different manner in 4-jet production, and treat them in the leading logarithmic approximation of pQCD that resums collinear logarithms in all orders. A special emphasis is given to $3\to4$ double hard interaction processes that occur as an interplay between large- and short-distance parton correlations and were not taken into consideration by approaches inspired by the parton model picture. We demonstrate that the $3\to4$ mechanism, being of the same order in $\as$ as the $4\to4$ process, turns out to be {\em geometrically enhanced} compared to the latter and should contribute significantly to 4-jet production. The framework developed here takes into systematic consideration perturbative $Q^2$ evolution of $_2$GPDs. It can be used as a basis for future analysis of NLO corrections to multi-parton interactions (MPI) at LHC and Tevatron colliders, in particular for improving evaluation of QCD backgrounds to new physics searches.
Blok Boris
Dokshitser Yu.
Frankfurt Leonid L.
Strikman Mark
No associations
LandOfFree
pQCD Physics of multiparton interactions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with pQCD Physics of multiparton interactions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and pQCD Physics of multiparton interactions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-40585