Multiparton Interactions in Photoproduction at HERA

Abstract

The high energy photoproduction of jets is being observed at the ep collider, HERA. It may be that the HERA centre-of-mass energy is sufficiently large that the production of more than one pair of jets per ep collision becomes possible, owing to the large number density of the probed gluons. We construct a Monte Carlo model of such multiparton interactions and study their effects on a wide range of physical observables. The conclusion is that multiple interactions could have very significant effects upon the photoproduction final state and that this would for example make extractions of the gluon density in the photon rather difficult. Total rates for the production of many (i.e. > 2) jets could provide direct evidence for the presence of multiple interactions, although parton showering and hadronization significantly affect low transverse energy jets.

21 pages, 8 figures included

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• Determining the Gluon Distributions in the Proton and Photon from Two-Jet Production at HERA
• Resolved Photon Processes
• Jets and Jet Multiplicities in High Energy Photon-Nucleon Inetraction:

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• Experimental Aspects of Jet Physics at a Future EIC
• Measurement of the WZ production cross section and limits on anomalous triple gauge couplings in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Measurement of the top quark charge in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Search for Supersymmetry in Events with Large Missing Transverse Momentum, Jets, and at Least One Tau Lepton in 7 TeV Proton-Proton Collision Data with the ATLAS Detector
• Search for flavour-changing neutral current top quark decays $t\to Hq$ in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Relativistic effects in model calculations of double parton distribution function
• Simultaneous measurements of the $t\bar{t}$, $W^{+}{W}^{-}$, and $Z/{\gamma }^{\ast }\to \tau \tau$ production cross-sections in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Search for large extra dimensions in dimuon and dielectron events in pp collisions at sqrt(s) = 7 TeV
• Search for a Standard Model Higgs boson in the H->ZZ->llnunu decay channel with the ATLAS detector
• Measurements of four-lepton production in $pp$ collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector
• Search for TeV-scale gravity signatures in final states with leptons and jets with the ATLAS detector at sqrt(s) = 7 TeV
• Stau as the Lightest Supersymmetric Particle in R-Parity Violating SUSY Models: Discovery Potential with Early LHC Data
• A measurement of the ratio of the production cross sections for W and Z bosons in association with jets with the ATLAS detector
• Multiple Parton Interactions, top--antitop and W+4j production at the LHC
• Measurement of tau polarization in W->taunu decays with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV
• Search for events with large missing transverse momentum, jets, and at least two tau leptons in 7 TeV proton-proton collision data with the ATLAS detector
• Search for strong gravity signatures in same-sign dimuon final states using the ATLAS detector at the LHC
• Measurement of the W to tau nu Cross Section in pp Collisions at sqrt(s) = 7 TeV with the ATLAS experiment
• Determination of spin and parity of the Higgs boson in the $W{W}^{\ast }\to e\nu \mu \nu$ decay channel with the ATLAS detector
• Measurement of dijet cross sections for events with a leading neutron in photoproduction at HERA
• A study of heavy flavor quarks produced in association with top quark pairs at sqrt(s) = 7 TeV using the ATLAS detector
• A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV
• Search for an excess of events with an identical flavour lepton pair and significant missing transverse momentum in sqrt{s} = 7 TeV proton-proton collisions with the ATLAS detector
• Direct top-quark decay width measurement in the $t\bar{t}$ lepton+jets channel at $\sqrt{s}$=8 TeV with the ATLAS experiment
• Measurement of the cross-section of high transverse momentum vector bosons reconstructed as single jets and studies of jet substructure in $pp$ collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector
• Measurement of the charge asymmetry in highly boosted top-quark pair production in $\sqrt{s}=$ 8 TeV $pp$ collision data collected by the ATLAS experiment
• Search for pair production of first or second generation leptoquarks in proton-proton collisions at sqrt(s)=7 TeV using the ATLAS detector at the LHC
• Searching for the triplet Higgs sector via central exclusive production at the LHC
• Prompt Photons in Photoproduction at HERA
• Search for resonant top plus jet production in ttbar + jets events with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV
• The Underlying Event and the Total Cross Section from Tevatron to the LHC
• Search for new particles decaying to ZZ using final states with leptons and jets with the ATLAS detector in sqrt(s) = 7 Tev proton-proton collisions
• Search for resonant diboson production in the lvjj decay channels with the ATLAS detector at 7 TeV
• Investigation of Monte Carlo Uncertainties on Higgs Boson searches using Jet Substructure
• Search for excited leptons in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Measurement of $WW/WZ\to \ell \nu q{q}^{\prime }$ production with the hadronically decaying boson reconstructed as one or two jets in $pp$ collisions at $\sqrt{s}=8$ TeV with ATLAS, and constraints on anomalous gauge couplings
• Spacetime Colour Reconnection in Herwig 7
• Search for a heavy Standard Model Higgs boson in the channel H->ZZ->llqq using the ATLAS detector
• Multi-parton correlations and "exclusive" cross sections
• Three- and four-jet final states in photoproduction at HERA
• Measurement of kT splitting scales in W->lv events at sqrt(s)=7 TeV with the ATLAS detector
• Measurement of the cross section of high transverse momentum $Z\to b\bar{b}$ production in proton--proton collisions at $\sqrt{s}=8TeV$ with the ATLAS Detector
• Search for microscopic black holes in a like-sign dimuon final state using large track multiplicity with the ATLAS detector
• Measurement of the inclusive and fiducial $t\bar{t}$ production cross-sections in the lepton+jets channel in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Dynamical approach to MPI in W+dijet and Z+dijet production within the PYTHIA event generator
• The Q^2 Dependence of Dijet Cross Sections in gamma p Interactions at HERA
• Hard underlying event correction to inclusive jet cross sections
• Search for single b*-quark production with the ATLAS detector at sqrt(s)=7 TeV
• Search for WH production with a light Higgs boson decaying to prompt electron-jets in proton-proton collisions at sqrt(s)=7 TeV with the ATLAS detector
• Measurement of the flavour composition of dijet events in pp collisions at sqrt{s}=7 TeV with the ATLAS detector
• Search for a multi-Higgs-boson cascade in WWbb events with the ATLAS detector in pp collisions at sqrt(s) = 8 TeV
• NMSSM in disguise: discovering singlino dark matter with soft leptons at the LHC
• Addendum to: A Theoretical Study of Top-Mass Measurements at the LHC Using NLO+PS Generators of Increasing Accuracy
• Search for a Standard Model Higgs boson in the H -> ZZ -> llnunu decay channel using 4.7 fb-1 of sqrt(s) = 7 TeV data with the ATLAS detector
• High-E_T dijet photoproduction at HERA
• Search for lepton flavour violation in the emu continuum with the ATLAS detector in sqrt(s) = 7 TeV pp collisions at the LHC
• Search for supersymmetry with jets, missing transverse momentum and at least one hadronically decaying tau lepton in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Search for resonant WZ production in the WZ to l nu l' l' channel in sqrt(s) = 7 TeV pp collisions with the ATLAS detector
• Measurement of the top quark branching ratios into channels with leptons and quarks with the ATLAS detector
• Measurement of $W^{\pm }$-boson and $Z$-boson production cross-sections in $pp$ collisions at $\sqrt{s}=2.76$ TeV with the ATLAS detector
• Measurement of the correlations between the polar angles of leptons from top quark decays in the helicity basis at $\sqrt{s}=7$TeV using the ATLAS detector
• Search for a Standard Model Higgs boson in the mass range 200-600 GeV in the H->ZZ->llqq decay channel
• A measurement of the ratio of the W and Z cross sections with exactly one associated jet in pp collisions at sqrt(s) = 7 TeV with ATLAS
• Measurement of single top-quark production in association with a $W$ boson in the single-lepton channel at $\sqrt{s}=8$ TeV with the ATLAS detector
• Precision measurements of the top quark mass from the Tevatron in the pre-LHC era
• Computational challenges for MC event generation
• Measurement of $\tau$ polarisation in $Z/{\gamma }^{\ast }\to \tau \tau$ decays in proton-proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Photoproduction of events with rapidity gaps between jets at HERA
• Hadronic Collisions in the Linked Dipole Chain Model
• Search for supersymmetry in events with photons, bottom quarks, and missing transverse momentum in proton-proton collisions at a centre-of-mass energy of 7 TeV with the ATLAS detector
• A Comparison of two different jet algorithms for the top mass reconstruction at the LHC
• Vector Bosons and Jets in Proton Collisions
• Search for Contact Interactions in Dimuon Events from pp Collisions at sqrt(s) = 7 TeV with the ATLAS Detector
• Search for the Standard Model Higgs boson produced in association with a vector boson and decaying into a tau pair in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• High Energy Photoproduction
• Double Diffraction Dissociation at High t
• Measurement of $W^{+}{W}^{-}$ production in association with one jet in proton--proton collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• EasyScan_HEP: a tool for connecting programs to scan the parameter space of physics models
• Combining single and double parton scatterings in a parton shower
• Hard color-singlet exchange in dijet events in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Measurement of the mass difference between top and anti-top quarks in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Measurement of jet activity in top quark events using the $e\mu$ final state with two $b$-tagged jets in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Ultra-forward particle production from CGC+Lund fragmentation
• Review of single vector boson production in pp collisions at $\sqrt{s}=7$ TeV
• Effects of invisible particle emission on global inclusive variables at hadron colliders
• The underlying event and fragmentation
• Measurement of the primary Lund jet plane density in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Boosted Top Quarks and Jet Structure
• Neutralino Reconstruction at the LHC from Decay-frame Kinematics
• Measurement of $K_S^0$ and ${\Lambda }^0$ production in $t\bar{t}$ dileptonic events in $pp$ collisions at $\sqrt{s}=$ 7 TeV with the ATLAS detector
• Photoproduction of dileptons and photons in p-p collisions at Large Hadron Collider energies
• Inclusive and "exclusive" cross sections in the regime of multiple parton collisions
• Strong coupling constant extraction from high-multiplicity Z+jets observables
• Forward Hadron Productions in high energy pp collisions from a Monte-Carlo generator for Color Glass Condensate
• Soft Particle Emission Accompanying Dijet Photoproduction
• Integrated and differential fiducial cross-section measurements for the vector boson fusion production of the Higgs boson in the $H\to W{W}^{\ast }\to e\nu \mu \nu$ decay channel at 13 $\text{TeV}$ with the ATLAS detector
• Measurements of the Production, Decay and Properties of the Top Quark: A Review
• Measurement of the $t\bar{t}$ production cross section in the $\tau$ + jets final state in $pp$ collisions at $\sqrt{s}=8$ TeV using the ATLAS detector
• Photoproductions of dileptons, photons, and light vector mesons in p-p, p-Pb, and Pb-Pb collisions at Large Hadron Collider energies
• A search for an excited muon decaying to a muon and two jets in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Study of dijet events with a large rapidity gap between the two leading jets in pp collisions at $\sqrt{s}$ = 7 TeV
• Local charge compensation from colour preconfinement as a key to the dynamics of hadronization
• Measurement of the inclusive $t\bar{t}$ production cross section in the lepton+jets channel in $pp$ collisions at $\sqrt{s}$= 7 TeV with the ATLAS detector using support vector machines
• Event Generators - New Developments
• The Underlying Event in Herwig++
• A perturbative treatment of double gluon exchange in gamma*-proton DIS
• Search for squarks and gluinos using final states with jets and missing transverse momentum with the ATLAS detector in sqrt(s) = 7 TeV proton-proton collisions
• Quantum Chromodynamics at Colliders
• Studying QCD in the Final State of High Energy Collisions
• Measurement of the WZ Production Cross Section in Proton-Proton Collisions at CME of 7 TeV with the ATLAS Detector
• A Large-$N$ Expansion for Minimum Bias
• Sparticle masses from hadronic decays
• Elastic and inelastic $J/\psi$ photoproduction in $p$-$p$ collisions at LHC energies: the feature of Weizsäcker-Williams approximation