Multiple Parton Interactions, top--antitop and W+4j production at the LHC

Abstract

The expected rate for Multiple Parton Interactions (MPI) at the LHC is large. This requires an estimate of their impact on all measurement foreseen at the LHC while opening unprecendented opportunities for a detailed study of these phenomena. In this paper we examine the MPI background to top-antitop production, in the semileptonic channel, in the early phase of data taking when the full power of $b$--tagging will not be available. The MPI background turns out to be small but non negligible, of the order of 20% of the background provided by W+4j production through a Single Parton Interaction. We then analyze the possibility of studying Multiple Parton Interactions in the W+4j channel, a far more complicated setting than the reactions examined at lower energies. The MPI contribution turns out to be dominated by final states with two energetic jets which balance in transverse momentum, and it appears possible, thanks to the good angular resolution of ATLAS and CMS, to separate the Multiple Parton Interactions contribution from Single Parton Interaction processes. The large cross section for two jet production suggests that also Triple Parton Interactions (TPI) could provide a non negligible contribution. Our preliminary analysis suggests that it might be indeed possible to investigate TPI at the LHC.

Typos fixed. Published in JHEP

References in corpus (19)

• Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton Distributions
• MadGraph/MadEvent v4: The New Web Generation
• MadEvent: Automatic Event Generation with MadGraph
• Automatic Generation of Tree Level Helicity Amplitudes
• Multiparton Interactions in Photoproduction at HERA
• A standard format for Les Houches Event Files
• Transverse-Momentum-Ordered Showers and Interleaved Multiple Interactions
• Multiple Interactions and the Structure of Beam Remnants
• Prospects for the Search for a Standard Model Higgs Boson in ATLAS using Vector Boson Fusion
• Simulation of multiple partonic interactions in Herwig++
• Double parton distributions in the leading logarithm approximation of perturbative QCD
• A New Method for Helicity Calculations
• PHANTOM: a Monte Carlo event generator for six parton final states at high energy colliders
• Double parton correlations versus factorized distributions
• A double parton scattering background to Higgs boson production at the LHC
• Double parton scatterings in b-quark pairs production at the LHC
• A Double Parton Scattering Background to Associate $WH$ and $ZH$ Production at the LHC
• Double parton scattering, diffraction and effective cross section
• Fractional momentum correlations in multiple production of W bosons and of b-anti_b pairs in high energy pp collisions

Cited by in corpus (23)

• Double Parton Distributions Incorporating Perturbative QCD Evolution and Momentum and Quark Number Sum Rules
• Elements of a theory for multiparton interactions in QCD
• Same-sign W pair production as a probe of double parton scattering at the LHC
• A fresh look at double parton scattering
• Cancellation of Glauber gluon exchange in the double Drell-Yan process
• Double parton scattering in double logarithm approximation of perturbative QCD
• Double heavy meson production through double parton scattering in hadronic collisions
• Production of two $c\bar{c}$ pairs in double-parton scattering
• Characteristics and Estimates of Double Parton Scattering at the Large Hadron Collider
• Forward Jets and Energy Flow in Hadronic Collisions
• Multiple parton interactions and forward double pion production in pp and dA scattering
• Multiple Parton Interactions in Z+4j, W\pm W\pm +0/2j and W+ W- +2j production at the LHC
• Disentangling correlations in Multiple Parton Interactions
• Testing the Scale Dependence of the Scale Factor in Double Dijet Production at the LHC
• Angular correlations in the double Drell-Yan process
• Prospects for observation of double parton scattering with four-muon final states at LHCb
• Multiple Hard Partonic Collisions with Correlations in Proton-Proton Scattering
• Possible indication to the QCD evolution of double parton distributions?
• Calculation of W b bbar Production via Double Parton Scattering at the LHC
• Asymptotic behavior of double parton distribution functions
• Collisions of protons with light nuclei shed new light on nucleon structure
• Incoherence and Multiple Parton Interactions
• Multiple Parton Interactions in Z+jets production at the LHC. A comparison of factorized and non--factorized double parton distribution functions