“…In particular, we present new tunes of the general purpose MC generators PYTHIA6 and HERWIG which improve upon previous ATLAS tunes, using a wider variety of measurements and/or higher precision data. …”
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“…These distributions are compared with the PYTHIA 6.4.20 predictions. The resulting spectra are in reasonable agreement. …”
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“…In this talk the following will be covered: First the Monte Carlo tools used to simulate the radiation backgrounds will be discussed, which include the transport codes FLUKA and GEANT4, as well as the collision event generators PHOJET and PYTHIA. Examples of the predictions at the ATLAS experiment will be shown, focussing in the inner detector regions.The second part of the talk will deal with the verification of these simulations, where the fluence and dose predictions are compared with measurements. …”
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“…For events containing an isolated photon with $p_T^\gamma > 60\:\mathrm{GeV}/c$ and an associated jet with $p_T^\mathrm{Jet} > 30\:\mathrm{GeV}/c$, the photon+jet transverse momentum balance is studied as a function of collision centrality and compared to pp data and PYTHIA calculations. Using the isolated photon as the probe of the partonic energy at production, this measurement allows an unbiased characterization of the in-medium parton energy loss. …”
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“…The differential cross sections $d^2\sigma/dp_T d\eta$ are compared to predictions from three approaches in perturbative quantum chromodynamics: (i) next- to-leading-order calculations obtained with and without matching to parton-shower Monte Carlo simulations, (ii) PYTHIA and HERWIG parton-shower event generators with different tunes of parameters, and (iii) CASCADE and HEJ models, including different non-collinear corrections to standard single-parton radiation.…”
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“…The dijet momentum balance, azimuthal angle correlations and pseudorapidity distributions are studied as a function of forward calorimeter transverse energy and compared to results from {\sc pythia} reference calculations representing \mbox{pp} collisions. …”
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“…All measurements are compared to predictions of MADGRAPH+PYTHIA6 Monte Carlo event generator based on multiparton matrix elements plus parton showers.…”
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“…The $R_{\rm pPb}$ of charged particles is determined bydividing the measured pPb spectrum by a pp reference spectrum constructed usinginterpolation methods, or alternatively from PYTHIA simulations.…”
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“…The objective of this project is to search for the uncertainty of $H \rightarrow b\bar{b}$ coupling via event generation and simulation. Pythia8 was utilized in event generation, Delphes for CMS detector simulation, and ROOT for data analysis. …”
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“…The corrected distributions are compared to Monte Carlo generators - Pythia 8 (A2 and Monash tunes), Herwig++, EPOS and QGSJET. …”
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“…The results are compared to predictions of different NLO Monte Carlo models and to variations of initial- and final-state radiation within Powheg+Pythia6 and good agreement is reached overall. Among the different shower variations the settings leading to more radiation describe the data best.…”
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“…The measurement is compatible with the expectation obtained from the POWHEG simulation interfaced with PYTHIA.…”
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“…The measurements are compared to tree-level plus parton-shower predictions from Sherpa and Pythia as well as to next-to-leading-order QCD predictions from Jetphox and Sherpa.…”
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“…We perform an Underlying Event analysis for real data sets from pp collisions at center of mass energy $ \sqrt{s}=5 $ and 13 TeV and pPb collisions at $ \sqrt{s}=7 $ TeV at the LHC, together with the Monte Carlo data sets generated with Pythia8 and EPOS in the same conditions. The analysis is focused on the transverse region which is more sensitive to the Underlying Event, and performed as a function of the leading track transverse - momentum $p_t$ in each event. …”
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“…The study is based on the Pythia8 Monte Carlo generator using representative event statistics for the HL-LHC and HE-LHC running conditions. …”
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“…Extracted jet shape and particle yield distributions for $\mathrm{b}$ jets are compared with results for inclusive jets, as well as with predictions from the PYTHIA event generator. The new results reveal a deficiency in the modeling of softer part of the jet fragmentation for both types of jets studied and set a baseline for future studies of parton flavor dependence of jet-medium interactions in heavy ion collisions.…”
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“…Comparisons of fluence predictions by Pythia8 $+$ FLUKA to the fluence determined from leakage current data combined with the Hamburg Model are made for each barrel layer and disk. …”
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“…It was discovered that the inclusive Monte Carlo simulations generated with Pythia and Powheg did not model the boosted jet and W$^{\pm}$ analysis well. …”
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“…Event generation is interfaced to external generators with an example implementation of a multi-threaded Pythia8 interface being included. The detector simulation is handled by the multithreaded version of Geant4 with an interface allowing for the parallel execution of multiple events at the same time as well as for parallelism within a single event.…”
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“…The amount of accumulated data allows us to make a validation of the results from our Pythia and Geant4 based Monte Carlo (FairShip). This analysis is a follow up of the full field inclusive muon flux analysis. …”
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