Abstract
The high parton densities at the Large Hadron Collider lead to a probability of occurrence of two or more parton-parton scatterings in a hadron-hadron collision. The possibility of two hard parton-parton scatterings in a hadron collision is known as double parton scattering (DPS) . The study of DPS processes, being performed using the various final states at different collision energies using the CMS detector at the Large Hadron Collider, has been presented. The DPS processes play an important role in hadron-hadron collisions as they act as a background to new physics searches. The study of DPS processes provides information on the parton-parton correlations and parton distributions in a hadron.
Highlights
The hard scattering between the partons from the colliding hadrons is characterized by the presence of a particle or a cluster of particles with large mass or large transverse momentum
This paper presents the measurement of σeff using the study of double parton scatterings being done with data collected by the
A useful feature of same-sign W boson pair production is the cross section, which is comparable for double parton scattering (DPS) and single parton scattering (SPS), whereas in opposite-sign W pair production the cross section for SPS events dominates over the DPS one by a bigger factor
Summary
The hard scattering between the partons from the colliding hadrons is characterized by the presence of a particle or a cluster of particles with large mass or large transverse momentum (pT). Two hard parton-parton scatterings in a protonproton (pp) collision leads to DPS, a subset of MPI. A number of DPS measurements are performed using events from pp and ppcollisions in different final states and at di√fferent centre-of-mass energies, e.g., measurements with multi-jet final-sta√tes at s = 63 GeV, 630 GeV, 1.8 TeV and 7 TeV [1–4]; in γ + 3 jets events at s =√1.8 TeV, 1.96 TeV and 7 TeV [5–7]; in W prod√uction associated with jets at s = 7 TeV [8, 9]; in same-sign WW events at s = 8 TeV [10] are available. The effective cross section (σeff ) for a hadron-hadron collision is defined as the measure of the transverse distribution of partons inside the colliding hadrons and their overlap in a collision.
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