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Showing 1 to 19 of 19 for “"Heavy Ion Collision"”.
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Pre-equilibrium photon and dilepton production from the early stages of high-energy heavy-ion collisions
It is well established that high-energy heavy-ion collision produce strongly interacting matter under extreme conditions similar to those at the beginning of the universe. One of these states of matter is known under the name quark-gluon plasma (QGP) and is one of the most unique states we are able …
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A review and application of the Hadron gas model to heavy ion collisions
A review and application of the Hadron Gas model to data gathered from heavy ion collision experiments in search of the Quark Gluon Plasma. The Hadron Gas model is extended by ensuring overall charge conservation of the collision system at freeze-out. Conclusions of thermal and chemical equilibrium …
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Self-Consistent Conversion of a Viscous Fluid to Particles and Heavy-Ion Applications
… framework to model the early stages of a heavy-ion collision is viscous hydrodynamics. Comparing hydrodynamic simulations to heavy-ion data inevitably requires the conversion of the fluid to particles. This conversion, typically done in the Cooper-Frye formalism, is ambiguous for viscous …
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Bose-Einstein condensation from a gluon transport equation
In this thesis we investigate the evolution of the quark gluon plasma, as produced in the early stages of a relativistic heavy ion collision, towards equilibrium. To this end we put forward a new numerical scheme to solve the QCD Boltzmann equation in the small-scattering angle approximation, which …
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Data-driven extraction of the substructure of quark and gluon jets in proton-proton and heavy-ion collisions
The modification of quark- and gluon-initiated jets in the quark-gluon plasma produced in heavy-ion collisions is a long-standing question that has not yet received a definitive answer from experiments. In particular, the size of the modifications differs between theoretical models. Therefore a …
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Second Order And Fluctuating Hydrodynamic Theory Of Two-Particle Transverse Momentum Correlations In Nuclear Collisions
<p>Relativistic heavy ion collision experiments show clear evidence of creation of a very short-lived phase of nuclear matter consisting of color-deconfined quarks and gluons. This matter is known as the quark-gluon plasma (QGP). Fluctuation and correlation measurements of the detected particles …
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Open and Hidden Charm Mesons at Finite Temperature from Anisotropic Lattice QCD
… of the Big Bang and it has been discovered in heavy ion collisions. The internal properties of the medium are not well understood. Due to its large mass and long thermalisation time, the charm quark is an excellent tool with which to probe the plasma. In this thesis I study the dissociation of …
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Boltzmann equation studies of the off-equilibrium QCD phenomena
Much of the evolution of the quark-gluon plasma (QGP) produced in heavy-ion collisions can be modeled by relativistic (viscous) hydrodynamics, which assumes that the partons are sufficiently close to equilibrium. We would like to explore the dynamics of QGP, even before this (quasi) equilibrium …
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Flux corrected transport applied to hydrodynamics for heavy ion collisions
… FCTHydro, a ROOT package, and its application to hydrodynamic simulations through the packages RelHydro and Nonideal xy. These packages aim to provide the broader heavy ion collision community with access to hydrodynamic simulation software which is now accessible from within the primary …
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Resolution effects in the hybrid strong/weak coupling model
… of the fact that the plasma produced in a heavy ion collision cannot resolve the substructure of a collimated parton shower within it to arbitrary resolution. We introduce a screening length parameter, LRes, proportional to the inverse of the local temperature in the plasma, estimating the …
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Measurement of charged particle multiplicity distribution in Au + Au collisions up to 200 GeV
Au+Au collisions in the Relativistic Heavy Ion Collider (RHIC) herald a new era of opportunities for studying hadronic matter under conditions of high energy density and nucleon density. The theory of strong interactions, Quantum Chromodynamics (QCD), tells us very little about the dynamics of a …
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Strongly coupled plasmas and the QCD critical point
… thesis, we begin by studying selected fluctuation observables in order to locate the QCD critical point in heavy-ion collision experiments. In particular, we look at the non-monotonic behavior as a function of the collision energy of higher, non-Gaussian, moments of the event-by-event …
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QCD Equilibrium and Dynamical Properties from Holographic Black Holes
… matter undergoes a crossover phase transition at high temperatures and zero net-baryon density. A key question in Quantum Chromodynamics (QCD) is whether a dense quark-gluon system exhibits critical phenomena when breaking the balance between quarks and antiquarks. Lattice QCD studies …
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Measurement of non-flow correlations and elliptic flow fluctuations in Au+Au collisions at RHIC
… of collective flow and two-particle correlations have proven to be effective tools for understanding the properties of the system produced in ultrarelativistic nucleus-nucleus collisions at the Relativistic Heavy Ion Collider (RHIC). Accurate modeling of the initial conditions of a heavy ion …
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Heavy quark interaction in Hot QCD matter: open charm and bottom production in relativistic Heavy-Ion Collisions
… field theory which describes the strong interaction within the Standard Model. The basic constituents of QCD are quarks and gluons that are confined in hadronic matter: at high temperatures and/or densities quark deconfinement occurs and hadronic matter undergoes a phase transition into a new …
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Space-time correlations of intermediate mass fragments emitted in Heavy ion reactions at Fermi energy by intensity interferometry studied with CHIMERA and perspectives
In collisioni tra ioni pesanti alle energie di Fermi (E/A compresa tra 10 MeV/nucleone e 100 MeV/nucleone) sono prodotti sistemi nucleari molto eccitati lontani dalla stabilità che possono decadere in una grande varietà di meccanismi sia dinamici che statistici con scale temporali molto diverse …
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Heavy quarks in the initial stages of proton-ion collisions [I quark pesanti negli stati iniziali delle collisioni protone-ione]
Le collisioni tra ioni pesanti, come Pb o Au, costituiscono uno strumento fondamentale per lo studio della teoria delle interazioni forti, ovvero la Cromodinamica Quantistica (QCD). In particolare, tali esperimenti permettono di ottenere informazioni su tutte le complesse fasi della materia …
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Far-from-equilibrium attractors and universality in ultra-relativistic heavy-ion collisions within relativistic kinetic theory [Attrattori e universalità in collisioni ultrarelativistiche tra ioni pesanti nel contesto della teoria cinetica del trasporto]
… dinamici, universalità e moti collettivi nelle collisioni ultra-relativistiche mediante la teoria cinetica relativistica. Dopo un’introduzione sulla Cromodinamica Quantistica (QCD), sul Quark-Gluon Plasma (QGP) e sull’importanza delle collisioni di ioni pesanti, viene fornita una panoramica dei …
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Hadron production within a full transport approach with Statistical Hadronization Mechanism in Ultra-Relativistic Heavy Ion Collisions
… delle particelle. La teoria descrive l'interazione tra i quark come mediata dai gluoni e possiede due proprietà principali: la libertà asintotica ultravioletta e il confinamento del colore. La combinazione di queste due caratteristiche suggerisce che una materia di quark e gluoni debolmente …