Abstract
A study of processes with double parton interactions (DPI) in pp collisions collected by DO detector at the Tevatron collider at √ s = 1.96 TeV is presented. The study includes measurements of DPI event fraction and the effective cross section, a process-independent parameter related to the effective interaction region inside a hadron. The measurements are done using processes with photon and hadronic jets in different parton-parton scatterings: photon+jet + dijet, photon+b/c + dijet and diphoton + dijet. The measured effective cross section is applied in order to estimate background from DPI processes to WH production at the Tevatron energy.
Highlights
High energy inelastic hadron-hadron collisions are generally described as a hard 2 → 2 partonic scattering with soft gluon radiation in initial and final states with account of fragmentation and hadronization effects
Some final states being produced by DPI mechanism can mimic rare processes produced by single parton-parton interaction (SPI)
A study of DPI at highpT regime provides the important information about hadron structure and crucial for precise estimates of background for many rare processes
Summary
High energy inelastic hadron-hadron collisions are generally described as a hard 2 → 2 partonic scattering with soft gluon radiation in initial and final states with account of fragmentation and hadronization effects. The cross section of a process with double parton interaction is proportional to cross sections of two partonic scatterings A and B: σDPI ≡ σAσB/σeff. The scaling parameter, σeff, historically called the effective cross section, having a unit of cross section, characterizes the size of the effective interaction region within a hadron. Some final states being produced by DPI mechanism can mimic rare processes produced by single parton-parton interaction (SPI). A study of DPI at highpT regime provides the important information about hadron structure and crucial for precise estimates of background for many rare processes
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