A5103286874- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Aerodynamics and Acoustics in Jet Flows
- Particle Detector Development and Performance
- Computational Fluid Dynamics and Aerodynamics
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Distributed and Parallel Computing Systems
- Nuclear physics research studies
- Advanced Data Storage Technologies
- Combustion and flame dynamics
- Black Holes and Theoretical Physics
- Superconducting Materials and Applications
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Precipitation Measurement and Analysis
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Gas Dynamics and Kinetic Theory
- Particle Accelerators and Free-Electron Lasers
- Meteorological Phenomena and Simulations
- Simulation Techniques and Applications
Lund University
2020-2024
University of Stavanger
2022
European Organization for Nuclear Research
2009-2020
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2017-2018
University of Lisbon
2015-2017
Durham University
2010-2012
École Polytechnique
2012
Heidelberg University
2006-2010
GSI Helmholtz Centre for Heavy Ion Research
2009
Uppsala University
2008
This Report summarizes the proceedings of 2015 Les Houches workshop on Physics at TeV Colliders. Session 1 dealt with (I) new developments relevant for high precision Standard Model calculations, (II) PDF4LHC parton distributions, (III) issues in theoretical description production Higgs bosons and how to relate experimental measurements, (IV) a host phenomenological studies essential comparing LHC data from Run I predictions projections future measurements II, (V) Monte Carlo event generators.
This Report summarizes the proceedings of 2015 Les Houches workshop on Physics at TeV Colliders. Session 1 dealt with (I) new developments relevant for high precision Standard Model calculations, (II) PDF4LHC parton distributions, (III) issues in theoretical description production Higgs bosons and how to relate experimental measurements, (IV) a host phenomenological studies essential comparing LHC data from Run I predictions projections future measurements II, (V) Monte Carlo event generators.
A bstract We present a conceptually new framework for describing jet evolution in the dense medium produced ultra-relativistic nucleus-nucleus collisions using perturbative QCD and its implementation into Monte Carlo event generator Jewel. The rescattering of hard partons is modelled by infrared continued pQCD matrix elements supplemented with parton showers. latter approximate higher order real-emission thus generate medium-induced gluon emissions. interplay between different emissions...
Realistic modeling of medium-jet interactions in heavy ion collisions is becoming increasingly important to successfully predict jet structure and shape observables. In Jewel, all partons belonging the parton showers initiated by hard scattered undergo with thermal from medium, leading both elastic radiative energy loss. The recoiling medium carry away momentum jet. Since component these recoils' momenta part soft background activity, comparison data requires implementation a subtraction...
The di-jet asymmetry—the measure of the momentum imbalance in a system—is key jet quenching observable. Using event generator Jewel we show that asymmetry is dominated by fluctuations both proton–proton and heavy-ion collisions. We discuss how collisions generated through recoil out-of-cone radiation. In two additional sources can contribute to asymmetry, namely energy loss differences path length. latter shown be sub-leading effect. implications our results for interpretation this
Studies of fully-reconstructed jets in heavy-ion collisions aim at extracting thermodynamical and transport properties hot dense QCD matter. Recently, a plethora new jet substructure observables have been theoretically experimentally developed that provide novel precise insights on the modifications parton radiation pattern induced by medium. This report, summarizing main lines discussion 5th Heavy Ion Jet Workshop CERN TH institute "Novel tools for physics collisions" 2017, presents first...
Jet quenching in heavy ion collisions is expected to be accompanied by recoil effects, but unambiguous signals for the induced medium response have been difficult identify so far. Here, we argue that modern jet substructure measurements can improve this situation qualitatively since they are sensitive momentum distribution inside jet. We show groomed subjet shared fraction $z_g$, and girth of leading subleading subjets signal effects with dependencies absent a recoilless baseline. find...
The 2011 Les Houches workshop was the first to confront LHC data. In two years since previous there have been significant advances in both soft and hard QCD, particularly areas of multi-leg NLO calculations, inclusion those calculations into parton shower Monte Carlos, tuning non-perturbative parameters Carlos. These proceedings describe theoretical that taken place, impact early data, for future development.
In this publication the first official release of Jewel 2.0.0 code [The version 1 (Zapp et al. in Eur Phys J C 60:617, 2009) could only treat elastic scattering explicitly and was never published, The can be downloaded from homepage http://jewel.hepforge.org ] is presented. a Monte Carlo event generator simulating QCD jet evolution heavy-ion collisions. It treats interplay radiation re-scattering medium with fully microscopic dynamics consistent perturbative framework minimal assumptions....
Abstract The physics program of ultra-relativistic heavy-ion collisions at the Large Hadron Collider (LHC) and Relativistic Heavy-Ion (RHIC) has brought a unique insight into hot dense QCD matter created in such collisions, Quark-Gluon Plasma (QGP). Jet quenching, collection medium-induced modifications jets’ internal structure that occur through their development matter, potential to assess time produced medium. In this work, we perform an exploratory study identify jet reclustering tools...
The non-Abelian Landau-Pomeranschuk-Migdal (LPM) effect arises from the quantum interference between spatially separated, inelastic radiation processes in matter. A consistent probabilistic implementation of this LPM is a prerequisite for extending use Monte Carlo (MC) event generators to simulation jetlike multiparticle final states nuclear collisions. Here, we propose local MC algorithm, which based solely on relating concept formation time virtual quanta. This accounts probabilistically...
In this publication the performance of Monte Carlo event generator JEWEL in non-central heavy-ion collisions is investigated. a consistent perturbative framework for jet evolution presence dense medium. It yields satisfactory description variety observables central at LHC, although so far with simplistic model Here, it demonstrated that also measurements collisions, and particular dependence suppression on angle relative to reaction plane, are reproduced by same model.
Processes in which a jet recoils against an electroweak boson complement studies of quenching heavy ion collisions at the LHC. As does not interact strongly it escapes dense medium unmodified and thus provides more direct access to hard scattering kinematics than can be obtained di-jet events. First measurements modification these processes are now available from LHC experiments will improve greatly with better statistics future. We present extension Jewel boson–jet processes. is dynamical...
Abstract Interactions of hard partons in the Quark Gluon Plasma (QGP) created with relativistic heavy ion collisions lead to characteristic modifications internal structure reconstructed jets. A large part observed jet sub-structure stem from QGP’s response energy and momentum deposited by partons. Good control over medium theoretical calculations is thus instrumental a quantitative understanding modified (quenched) jets collisions. We present an improved way handling quenching model Jewel...
Monte Carlo (MC) simulations are the standard tool for describing jet-like multi-particle final states. To apply them to simulation of medium-modified jets in heavy ion collisions, a probabilistic implementation medium-induced quantum interference effects is needed. Here, we analyze detail how included BDMPS-Z formalism gluon radiation can be implemented quantitatively controlled, local parton cascade. The resulting MC algorithm formulated terms elastic and inelastic mean free paths, it by...
Triple gauge boson hadroproduction, in particular the production of three $W$-bosons at LHC, is considered next-to leading order accuracy QCD. The NLO matrix elements are combined with parton showers. Multijet merging invoked such that one additional jet also included. studies here incorporate both signal and all relevant backgrounds for $VH$ subsequent decay Higgs into $W$-- or $\tau$--\-pairs. They have been performed using \SherpaOpenLoops combination Collier.
Energy and momentum loss of jets in heavy ion collisions can affect the fluid dynamic evolution medium. We determine realistic event-by-event averages correlation functions local energy-momentum transfer from hard particles to soft sector using jet-quenching Monte-Carlo code Jewel combined with a hydrodynamic model for background. The expectation values source terms due typical (minimum-bias) event mainly by their transfer. This leads small increase flow. presence constitutes only minor correction.
Abstract We introduce the parton cascade Alpaca , which evolves ensembles corresponding to single events according effective kinetic theory of QCD at high temperature formulated by Arnold, Moore and Yaffe explicitly simulating elastic scattering, splitting merging. By taking ensemble average over many phase space density (as evolved Boltzmann equation) is recovered, but can go beyond evolution mean because it be turned into a complete event generator that produces fully exclusive final...
The di-jet asymmetry --- the measure of momentum imbalance in a system is key jet quenching observable. Using event generator \jewel we show that dominated by fluctuations both proton-proton and heavy ion collisions. We discuss how collisions generated through recoil out-of-cone radiation. In two additional sources contribute to asymmetry, namely energy loss differences path length. latter shown be sub-leading effect. implications our results for interpretation this
The fast evolution of the QGP makes its interaction with jets an inherently time-dependent process. However, this crucial dimension is missing from traditional jet quenching measurements, which hence provide a mere average quantification medium properties. Jet substructure observables effective strategy to access time structure. By identifying recursive steps novel clustering algorithm (the $\tau$ algorithm) sequence branchings parton shower, it possible obtain adequate proxy for axis within...
Abstract In this manuscript, we illustrate how to use the newly proposed $$\tau $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math> re-clustering algorithm select jets with different degrees of quenching without biasing their initial transverse momentum spectrum. Our study is based on Z+jet simulated events using JEWEL Monte Carlo event generator account for jet effects. We apply extract a proxy time axis (formation time) within evolving medium. This...