MCPLOTS: a particle physics resource based on volunteer computing

Karneyeu, A.; Mijović, L.; Prestel, S.; Skands, Peter

doi:10.1140/epjc/s10052-014-2714-9

Cited by 36 publications

(38 citation statements)

References 47 publications

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“…The dependence of the charged particle production on the cms energy of the collision is tunable in PYTHIA, and this energy dependence has been derived from comparing to minimum bias data (and underlying event data for 4Cx) at 900 GeV and 7 TeV. Good agreement with the data can be reached for all models also at 900 GeV [51]. This also leads to similar predictions for the yet unmeasured charged particle production at the LHC design energy of 14 TeV as shown in Fig.…”

Section: Comparison With Other Minimum Bias Modelsmentioning

confidence: 62%

“…In the following we compare different LHC measurements to three different setups: EPOS LHC, PYTHIA6 with the AMBT1 tune [33] which was tuned to the ATLAS minimum bias data, and to PYTHIA8 [48] with tune 4Cx [49] which was derived from comparison to minimum bias and underlying event data from LHC. The plots were made using Rivet [50] and are partially taken from MCPLOTS [51]. Figure 23 shows the charged particle production at LHC at 7 TeV with the requirement that the charged particles have a minimum p t of 500 MeV.…”

Section: Comparison With Other Minimum Bias Modelsmentioning

confidence: 99%

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EPOS LHC: Test of collective hadronization with data measured at the CERN Large Hadron Collider

et al. 2015

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EPOS is a Monte Carlo event generator for minimum bias hadronic interactions, used for both heavy ion interactions and cosmic ray air shower simulations. Since the last public release in 2009, the Large Hadron Collider (LHC) experiments have provided a number of very interesting data sets comprising minimum bias p-p, p-Pb, and Pb-Pb interactions. We describe the changes required to the model to reproduce in detail the new data available from the LHC and the consequences in the interpretation of these data. In particular we discuss the effect of the collective hadronization in p-p scattering. A different parametrization of flow has been introduced in the case of a small volume with high density of thermalized matter (core) reached in p-p compared to large volume produced in heavy ion collisions. Both parametrizations depend only on the geometry and the amount of secondary particles entering in the core and not on the beam mass or energy. The transition between the two flow regimes can be tested with p-Pb data. EPOS LHC is able to reproduce all minimum bias results for all particles with transverse momentum from p t = 0 to a few GeV/c.

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Section: Comparison With Other Minimum Bias Modelsmentioning

confidence: 62%

Section: Comparison With Other Minimum Bias Modelsmentioning

confidence: 99%

EPOS LHC: Test of collective hadronization with data measured at the CERN Large Hadron Collider

et al. 2015

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“…14 13 Both vincia and pythia are known to give quite good fits to LEP data [24,31,67,68]. For comparisons including other generators and tunes, see mcplots.cern.ch [69]. 14 The differences in soft fragmentation parameters between existing LO vincia and pythia-8 tunes could be used as an initial guideline for such an effort, see, e.g., appendix D. 10.…”

Section: Lep Resultsmentioning

confidence: 99%

Antenna showers with one-loop matrix elements

Hartgring

Laenen

2013

J. High Energ. Phys.

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We consider the probability for a colour-singlet qq pair to emit a gluon, in strongly and smoothly ordered antenna showers. We expand to second order in α s and compare to the second-order QCD matrix elements for Z → 3 jets, neglecting terms suppressed by 1/N 2 C . We give a prescription that corrects the shower to the matrix-element result at this order for both soft and hard emissions, thereby explicitly reducing its dependence on evolution-and renormalization-scale choices. We confirm that the choice of p ⊥ for both of these scales absorbs all logarithms through O(α 2 s ), and contrast this with various alternatives. We include these corrections in the vincia shower generator and study the impact on LEP event-shape and fragmentation observables. An uncertainty estimate is provided for each event, in the form of a vector of alternative weights.

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“…We therefore encourage efforts to determine the extent to which Rivet implementations of these measurements are practicable, and to begin that process if the corrections are deemed to be sufficiently model independent. This would enable a broader suite of LEP measurements to be included in the next round of parton-shower tunes and in global comparisons such as MCplots 20 [135].…”

Section: Jhep07(2017)091mentioning

confidence: 99%

Systematics of quark/gluon tagging

Gras

Höche

Kar

et al. 2017

J. High Energ. Phys.

120

158

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By measuring the substructure of a jet, one can assign it a "quark" or "gluon" tag. In the eikonal (double-logarithmic) limit, quark/gluon discrimination is determined solely by the color factor of the initiating parton (C F versus C A ). In this paper, we confront the challenges faced when going beyond this leading-order understanding, using both parton-shower generators and first-principles calculations to assess the impact of higher-order perturbative and nonperturbative physics. Working in the idealized context of electron-positron collisions, where one can define a proxy for quark and gluon jets based on the Lorentz structure of the production vertex, we find a fascinating interplay between perturbative shower effects and nonperturbative hadronization effects. Turning to protonproton collisions, we highlight a core set of measurements that would constrain current uncertainties in quark/gluon tagging and improve the overall modeling of jets at the Large Hadron Collider.

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MCPLOTS: a particle physics resource based on volunteer computing

Cited by 36 publications

References 47 publications

EPOS LHC: Test of collective hadronization with data measured at the CERN Large Hadron Collider

EPOS LHC: Test of collective hadronization with data measured at the CERN Large Hadron Collider

Antenna showers with one-loop matrix elements

Systematics of quark/gluon tagging

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