ORCID Profile
0000-0003-0024-3822
Current Organisation
Monash University
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Atomic, Molecular, Nuclear, Particle and Plasma Physics | Particle Physics | Particle physics | Particle and high energy physics |
Publisher: American Physical Society (APS)
Date: 08-2006
Publisher: Elsevier BV
Date: 11-2014
Publisher: Springer Science and Business Media LLC
Date: 11-2018
Publisher: Springer Science and Business Media LLC
Date: 09-05-2006
Publisher: EDP Sciences
Date: 2013
Publisher: Elsevier BV
Date: 02-2007
Publisher: American Physical Society (APS)
Date: 20-10-2010
Publisher: Springer Science and Business Media LLC
Date: 10-2017
Publisher: Springer Science and Business Media LLC
Date: 09-02-2006
Publisher: EDP Sciences
Date: 2016
Publisher: Springer Science and Business Media LLC
Date: 08-2015
Publisher: Springer Science and Business Media LLC
Date: 05-2016
Publisher: Springer Science and Business Media LLC
Date: 25-07-2007
Publisher: Springer Science and Business Media LLC
Date: 09-2008
Publisher: Elsevier BV
Date: 02-2007
Publisher: Elsevier BV
Date: 2009
Publisher: American Physical Society (APS)
Date: 03-10-2016
Publisher: Springer Science and Business Media LLC
Date: 06-2012
Abstract: We report on the implementation of an interface between the SANC generator framework for Drell-Yan hard processes, which includes next-to-leading order electroweak (NLO EW) corrections, and the Herwig++ and Pythia8 QCD parton shower Monte Carlos. A special aspect of this implementation is that the initial-state shower evolution in both shower generators has been augmented to handle the case of an incoming photon-in-a- proton, diagrams for which appear at the NLO EW level. The difference between shower algorithms leads to residual differences in the relative corrections of 2-3 % in the p T ( μ ) distributions at p T ( μ ) ≳ 50 GeV (where the NLO EW correction itself is of order 10 %).
Publisher: Springer Science and Business Media LLC
Date: 18-09-2006
Publisher: Springer Science and Business Media LLC
Date: 03-2002
Publisher: Elsevier BV
Date: 2007
Publisher: Springer Science and Business Media LLC
Date: 28-10-2016
Publisher: Walter de Gruyter GmbH
Date: 29-12-2017
Abstract: The LHC@Home BOINC project has provided computing capacity for numerical simulations to researchers at CERN since 2004, and has since 2011 been expanded with a wider range of applications. The traditional CERN accelerator physics simulation code SixTrack enjoys continuing volunteers support, and thanks to virtualisation a number of applications from the LHC experiment collaborations and particle theory groups have joined the consolidated LHC@Home BOINC project. This paper addresses the challenges related to traditional and virtualized applications in the BOINC environment, and how volunteer computing has been integrated into the overall computing strategy of the laboratory through the consolidated LHC@Home service. Thanks to the computing power provided by volunteers joining LHC@Home, numerous accelerator beam physics studies have been carried out, yielding an improved understanding of charged particle dynamics in the CERN Large Hadron Collider (LHC) and its future upgrades. The main results are highlighted in this paper.
Publisher: EDP Sciences
Date: 2015
Publisher: Springer Science and Business Media LLC
Date: 05-2011
Publisher: Elsevier BV
Date: 2010
Publisher: Springer Science and Business Media LLC
Date: 30-11-2015
Publisher: Springer Science and Business Media LLC
Date: 04-2014
Publisher: Stichting SciPost
Date: 10-01-2022
DOI: 10.21468/SCIPOSTPHYS.12.1.010
Abstract: We discuss and illustrate the properties of several parton-shower algorithms available in Pythia and Vincia, in the context of Higgs production via vector boson fusion (VBF). In particular, the distinctive colour topology of VBF processes allows to define observables sensitive to the coherent radiation pattern of additional jets. We study a set of such observables, using the Vincia sector-antenna shower as our main reference, and contrast it to Pythia's transverse-momentum-ordered DGLAP shower as well as Pythia's dipole-improved shower. We then investigate the robustness of these predictions as successive levels of higher-order perturbative matrix elements are incorporated, including next-to-leading-order matched and tree-level merged calculations, using Powheg Box and Sherpa respectively to generate the hard events.
Publisher: Springer Science and Business Media LLC
Date: 12-2012
Publisher: Springer Science and Business Media LLC
Date: 11-2007
Publisher: Springer Science and Business Media LLC
Date: 02-2005
Publisher: Springer Science and Business Media LLC
Date: 11-2011
Publisher: IOP Publishing
Date: 23-12-2011
Publisher: Elsevier BV
Date: 08-2017
Publisher: American Physical Society (APS)
Date: 06-09-2011
Publisher: Springer Science and Business Media LLC
Date: 02-2014
Publisher: Elsevier BV
Date: 02-2012
Publisher: Springer Science and Business Media LLC
Date: 07-2012
Publisher: Elsevier BV
Date: 05-2003
Publisher: Elsevier BV
Date: 06-2015
Publisher: Springer Science and Business Media LLC
Date: 10-2014
DOI: 10.1038/514174A
Publisher: American Physical Society (APS)
Date: 12-01-2012
Publisher: IOP Publishing
Date: 13-12-2012
Publisher: American Physical Society (APS)
Date: 17-08-2018
Publisher: Springer Science and Business Media LLC
Date: 07-2020
Abstract: In conventional parton showers (including ones based on dipoles/antennae), a given (Born + m )-parton configuration can typically be reached via O ( m !) different “shower histories”. In the context of matrix-element-correction and merging procedures, accounting for these histories mandates fairly complex and resource-intensive algorithms. A so far little-explored alternative in the shower context is to ide the branching phase spaces into distinct “sectors”, each of which only receives contributions from a single branching kernel. This has a number of consequences including making the shower operator bijective i.e., each parton configuration now has a single unique “inverse”. As a first step towards developing a full-fledged matrix-element-correction and merging procedure based on such showers, we here extend the sector approach for antenna showers to hadron-hadron collisions, including mass and helicity dependence.
Publisher: IOP Publishing
Date: 13-12-2012
Publisher: Springer Science and Business Media LLC
Date: 07-2012
Abstract: Coherent QCD radiation in the hadroproduction of top quark pairs leads to a forward-backward asymmetry that grows more negative with increasing transverse momentum of the pair. This feature is present in Monte Carlo event generators with coherent parton showering, even though the production process is treated at leading order and has no intrinsic asymmetry before showering. In addition, depending on the treatment of recoils, showering can produce a positive contribution to the inclusive asymmetry. We explain the origin of these features, compare them in fixed-order calculations and the H erwig ++, P ythia and S herpa event generators, and discuss their implications.
Publisher: Springer Science and Business Media LLC
Date: 08-2014
Publisher: Stichting SciPost
Date: 19-05-2020
DOI: 10.21468/SCIPOSTPHYS.8.5.080
Abstract: Motivated by recent discoveries of flow-like effects in pp collisions, and noting that multiple string systems can form and hadronize simultaneously in such collisions, we develop a simple model for the repulsive interaction between two Lund strings with a positive (colour-oriented) overlap in rapidity. The model is formulated in momentum space and is based on a postulate of a constant net transverse momentum being acquired per unit of overlap along a common rapidity direction. To conserve energy, the strings shrink in the longitudinal direction, essentially converting a portion of the string invariant mass m^2 m 2 into p_\\perp^2 p ⊥ 2 for constant m_\\perp^2 = m^2 + p_\\perp^2 m ⊥ 2 = m 2 + p ⊥ 2 for each string. The reduction in string invariant mass implies a reduced overall multiplicity of produced hadrons the increase in p_\\perp^2 p ⊥ 2 is local and only affects hadrons in the overlapping region. Starting from the simplest case of two symmetric and parallel strings with massless endpoints, we generalize to progressively more complicated configurations. We present an implementation of this model in the Pythia event generator and use it to illustrate the effects on hadron p_\\perp p ⊥ distributions and dihadron azimuthal correlations, contrasting it with the current version of the “shoving” model implemented in the same generator.
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 06-2008
Publisher: Springer Science and Business Media LLC
Date: 07-2017
Publisher: Elsevier BV
Date: 2013
Publisher: American Physical Society (APS)
Date: 24-04-2009
Publisher: American Physical Society (APS)
Date: 26-03-2013
Publisher: Springer Science and Business Media LLC
Date: 05-2011
Publisher: Elsevier BV
Date: 09-2010
Publisher: American Physical Society (APS)
Date: 30-07-2008
Publisher: IOP Publishing
Date: 07-05-2019
Publisher: Springer Science and Business Media LLC
Date: 10-07-2007
Publisher: Springer Science and Business Media LLC
Date: 11-2020
DOI: 10.1140/EPJC/S10052-020-08654-9
Abstract: Motivated by recent theoretical arguments that expanding strings can be regarded as having a temperature that is inversely proportional to the proper time, $$\\tau $$ τ , we investigate the consequences of adding a term $$\\propto 1/\\tau $$ ∝ 1 / τ to the string tension in the Lund string-hadronization model. The lattice value for the tension, $$\\kappa _0 \\sim 0.18\\,{\\mathrm {GeV}}^2\\sim 0.9\\,{\\mathrm {GeV}}/{\\mathrm {fm}}$$ κ 0 ∼ 0.18 GeV 2 ∼ 0.9 GeV / fm , is then interpreted as the late-time/equilibrium limit. A generic prediction of this type of model is that early string breaks should be associated with higher strangeness (and baryon) fractions and higher fragmentation $$\\langle p_\\perp \\rangle $$ ⟨ p ⊥ ⟩ values. It should be possible to use archival ee data sets to provide model-independent constraints on this type of scenario, and we propose a few simple key measurements to do so.
Publisher: Elsevier BV
Date: 12-2020
Publisher: Springer Science and Business Media LLC
Date: 09-2022
DOI: 10.1140/EPJC/S10052-022-10710-5
Abstract: Beauty and charm quarks are ideal probes of pertubative Quantum Chromodymanics in proton–proton collisions, owing to their large masses. In this paper the role of multi-parton interactions in the production of doubly-heavy hadrons is studied using simulation s les generated with Pythia , a Monte Carlo event generator. Comparisons are made to the stand-alone generators BcVegPy and GenXicc . New methods of speeding up Pythia simulations for events containing heavy quarks are described, enabling the production of large s les with multiple heavy-quark pairs. We show that significantly higher production rates of doubly-heavy hadrons are predicted in models that allow heavy quarks originating from different parton–parton interactions (within the same hadron–hadron collision) to combine to form such hadrons. Quantitative predictions are sensitive to the modelling of colour reconnections. We suggest a set of experimental measurements capable of differentiating these additional contributions.
Publisher: Springer Science and Business Media LLC
Date: 10-2013
Abstract: We consider the probability for a colour-singlet $ q\\overline{q} $ 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 \\left/ {{N_C^2}} \\right.} $ . 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 $ \\mathcal{O}\\left( {\\alpha_s^2} \\right) $ , 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.
Publisher: Springer Science and Business Media LLC
Date: 25-11-2003
Publisher: WORLD SCIENTIFIC
Date: 25-09-2013
Publisher: American Physical Society (APS)
Date: 11-10-2019
Publisher: Elsevier BV
Date: 02-2014
Publisher: Springer Science and Business Media LLC
Date: 10-2014
Start Date: 2023
End Date: 12-2025
Amount: $573,917.00
Funder: Australian Research Council
View Funded ActivityStart Date: 05-2022
End Date: 05-2025
Amount: $386,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 10-2014
End Date: 10-2019
Amount: $747,740.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2017
End Date: 12-2022
Amount: $299,000.00
Funder: Australian Research Council
View Funded Activity