Consistent simulation of non-resonant diphoton production at hadron collisions with a custom-made parton shower

Abstract

We have developed a Monte Carlo event generator for non-resonant diphoton ($\gamma \gamma$) production at hadron collisions in the framework of GR@PPA, which consistently includes additional one-jet production. The jet-matching method developed for initial-state jet production has been extended to the final state in order to regularize the final-state QED divergence in the $qg\to \gamma \gamma +q$ process. A QCD/QED-mixed parton shower (PS) has been developed to complete the matching. The PS has the capability of enforcing hard-photon radiation, and small-$Q^2$ photon radiations that are not covered by the PS are supplemented by using a fragmentation function. The generated events can be passed to general-purpose event generators in order to perform the simulations down to the hadron level. Thus, we can simulate the isolation requirements that must be applied in experiments at the hadron level. The simulation results are in reasonable agreement with the predictions from RESBOS and DIPHOX. The simulated hadron-level events can be further fed to detector simulations in order to investigate the detailed performance of experiments.

23 pages, 15 figures

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• PYTHIA 6.4 Physics and Manual
• Herwig++ Physics and Manual
• Search for the Standard Model Higgs boson in the diphoton decay channel with 4.9 fb-1 of pp collisions at sqrt(s) = 7 TeV with ATLAS
• Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV
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• Next-to-Leading-Order Monte Carlo Simulation of Diphoton Production in Hadronic Collisions
• GR@PPA 2.7 event generator for $pp$/$p\bar{p}$ collisions
• Initial-state parton shower kinematics for NLO event generators
• GR@PPA 2.8: initial-state jet matching for weak boson production processes at hadron collisions
• A consistent event generation for non-resonant diphoton production at hadron collisions

Cited by in corpus (7)

• Isolating Prompt Photons with Narrow Cones
• Photon isolation effects at NLO in gamma gamma + jet final states in hadronic collisions
• Consistent simulation of direct-photon production in hadron collisions including associated two-jet production
• ME-PS matching in the simulation of multi-jet production in hadron collisions using a subtraction method
• Consistent simulation of non-resonant diphoton production in hadron collisions including associated jet production up to two jets
• Precise simulation of the initial-state QCD activity associated with $Z$-boson production in hadron collisions
• GR@PPA 2.9: radiation matching for simulating photon production processes in hadron collisions