Monte Carlo event generators for high energy particle physics event simulation (original) (raw)
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Monte Carlo event generator validation and tuning for the LHC
2009
We summarise the motivation for, and the status of, the tools developed by CEDAR/MCnet for validating and tuning Monte Carlo event generators for the LHC against data from previous colliders. We then present selected preliminary results from studies of event shapes and hadronisation observables from e + e − colliders, and of minimum bias and underlying event observables from the Tevatron, and comment on the approach needed with early LHC data to best exploit the potential for new physics discoveries at the LHC in the next few years. lar, the LHC will be a probe of QCD machine as it has never been seen before: the proton will be probed in regions of high momentum transfer and low Björken x (requiring a new understanding of parton densities and hence new PDF fits), jets above 1 TeV will be seen, and the behaviour of the pp total cross-section and multiple parton interactions will be measured at values of √ s where current data offer little constraint. It is certain that the SM will need to be measured and understood in this new regime before any new physics discovery can be claimed with confidence.
General-purpose event generators for LHC physics
Physics Reports-review Section of Physics Letters, 2011
We review the physics basis, main features and use of general-purpose Monte Carlo event generators for the simulation of proton-proton collisions at the Large Hadron Collider. Topics included are: the generation of hardscattering matrix elements for processes of interest, at both leading and nextto-leading QCD perturbative order; their matching to approximate treatments of higher orders based on the showering approximation; the parton and dipole shower formulations; parton distribution functions for event generators; non-perturbative aspects such as soft QCD collisions, the underlying event and diffractive processes; the string and cluster models for hadron formation; the treatment of hadron and tau decays; the inclusion of QED radiation and beyond-Standard-Model processes. We describe the principal features of the Ariadne, Herwig ++ , Pythia 8 and Sherpa generators, together with the Rivet and Professor validation and tuning tools, and discuss the physics philosophy behind the proper use of these generators and tools. This review is aimed at phenomenologists wishing to understand better how parton-level predictions are translated into hadron-level events as well as experimentalists wanting a deeper insight into the tools available for signal and background simulation at the LHC.
Chinese Physics C
In this paper we present a comparative study between PYTHIA, EPOS, QGSJET, and SIBYLL generators. The global event observables considered are the charged energy flow, charged particle distributions, charged hadron production ratios and V 0 ratios. The study is performed in the LHCb and TOTEM fiducial phase spaces on minimum bias simulated data samples for pp collisions at = 7 TeV , using the reference measurements from these experiments. In the majority of cases, the measurements are within a band defined by the most extreme predictions. The observed differences between the predictions and the measurements seem to be, in most part, caused by extrapolation from the central pseudorapidity region (|η| 2.5), in which the generators were mainly tuned.
HL-LHC Computing Review Stage-2, Common Software Projects: Event Generators
2021
This paper has been prepared by the HEP Software Foundation (HSF) Physics Event Generator Working Group (WG), as an input to the second phase of the LHCC review of High-Luminosity LHC (HL-LHC) computing, which is due to take place in November 2021. It complements previous documents prepared by the WG in the context of the first phase of the LHCC review in 2020, including in particular the WG paper on the specific challenges in Monte Carlo event generator software for HL-LHC, which has since been updated and published, and which we are also submitting to the November 2021 review as an integral part of our contribution.
Les Houches guidebook to Monte Carlo generators for hadron collider physics
Arxiv preprint hep-ph/ …, 2004
Abstract: Recently the collider physics community has seen significant advances in the formalisms and implementations of event generators. This review is a primer of the methods commonly used for the simulation of high energy physics events at particle colliders. We ...
Systematic event generator tuning for the LHC
European Physical Journal C, 2010
In this article we describe Professor, a new program for tuning model parameters of Monte Carlo event generators to experimental data by parameterising the per-bin generator response to parameter variations and numerically optimising the parameterised behaviour. Simulated experimental analysis data is obtained using the Rivet analysis toolkit. This paper presents the Professor procedure and implementation, illustrated with the application of the method to tunes of the Pythia 6 event generator to data from the LEP/SLD and Tevatron experiments. These tunes are substantial improvements on existing standard choices, and are recommended as base tunes for LHC experiments, to be themselves systematically improved upon when early LHC data is available.
Round Table Discussion: Event generation - are we ready for LHC?
Proceedings of XII Advanced Computing and Analysis Techniques in Physics Research — PoS(ACAT08)
The working group "Methodology of Computations in Theoretical Physics" concluded their parallel meetings with a round table discussion on various topics concerning the status and prospects of Monte-Carlo event generators for LHC. This note gathers together the main points and contributions of this discussion.
First three Meetings of the Workshop on Monte Carlo's, Physics and Simulations at the LHC, Part II
These proceedings collect the presentations given at the first three meetings of the INFN "Workshop on Monte Carlo's, Physics and Simulations at the LHC", held at the Frascati National Laboratories in 2006. The first part of these proceedings contains pedagogical introductions to several basic topics of both theoretical and experimental high pT LHC physics. The second part collects more specialised presentations.
Performance of Monte Carlo event generators of pp collisions at NICA energies
2021
This paper presents an overview of Monte Carlo(MC) event generators for simulation of proton-proton collisions along with the results on hadron production at Nuclotronbased Ion Collider fAcility (NICA) energies. Namely, mean multiplicities, mean transverse momenta, and rapidity distributions of p(p̄), K±, π± at different collision energies are presented. We also study two-particle angular correlations for stable charged particles. Results of MC simulations are compared to available data. Connections of studied quantities with physics mechanisms in MC generators are discussed.
WWGENPV 2.0 — A Monte Carlo event generator for four-fermion production at e+e− colliders
Computer Physics Communications, 1997
The Monte Carlo program WWGENPV, designed for computing distributions and generating events for four-fermion production in e + e − collisions, is described. The new version, 2.0, includes the full set of the electroweak (EW) tree-level matrix elements for double-and single-W production, initial-and final-state photonic radiation including p T /p L effects in the Structure Function formalism, all the relevant non-QED corrections (Coulomb correction, naive QCD, leading EW corrections). An hadronisation interface to JETSET is also provided. The program can be used in a three-fold way: as a Monte Carlo integrator for weighted events, providing predictions for several observables relevant for W physics; as an adaptive integrator, giving predictions for cross sections, energy and invariant mass losses with high numerical precision; as an event generator for unweighted events, both at partonic and hadronic level. In all the branches, the code can provide accurate and fast results.