Regular Article - Theoretical Physics
pQCD physics of multiparton interactions
Department of Physics, Technion—Israel Institute of Technology, 32000, Haifa, Israel
2 Laboratory of High Energy Theoretical Physics (LPTHE), University Paris 6, Paris, France
3 School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, 69978, Tel Aviv, Israel
4 Physics Department, Penn State University, University Park, PA, USA
* e-mail: email@example.com
Revised: 12 March 2012
Published online: 11 April 2012
We study production of two pairs of jets in hadron–hadron collisions in view of extracting contribution of double hard interactions of three and four partons (3→4, 4→4). 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→4, in the 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, 2GPDs (Block et al., Phys. Rev. D 83, 071501, 2011), and treat them in the leading logarithmic approximation of pQCD that resums collinear logarithms in all orders.
A special emphasis is given to 3→4 double hard interaction processes which, being of the same order in as the 4→4 process, turn out to be geometrically enhanced compared to the latter and should contribute significantly to four-jet production.
The framework developed here takes into systematic consideration perturbative Q 2 evolution of 2GPDs. It can be used as a basis for future analysis of NLO corrections to multiparton interactions (MPI) at LHC and Tevatron colliders, in particular for improving evaluation of QCD backgrounds to new physics searches.
© Springer-Verlag / Società Italiana di Fisica, 2012