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We systematically compare an event-by-event transport+viscous hydrodynamics hybrid model to data from the RHIC beam energy scan using a general Bayesian method. We demonstrate how the inclusion of multistrange hadron observables affects the…

Nuclear Theory · Physics 2017-03-08 Jussi Auvinen , Krzysztof Redlich , Steffen A. Bass

Relativistic heavy ion collisions generate nuclear-sized droplets of quark-gluon plasma (QGP) that exhibit nearly inviscid hydrodynamic expansion. Smaller collision systems such as p+Au, d+Au, and $^{3}$He+Au at the Relativistic Heavy Ion…

Nuclear Theory · Physics 2020-04-29 M. Byres , S. H. Lim , C. McGinn , J. Ouellette , J. L. Nagle

We show that the Linear Sigma Model with quarks produces an effective description of the QCD phase diagram and of the system's equilibrium distribution properties that deviate from those of the Hadron Resonance Gas Model. The deviation is…

The production and space-time evolution of heavy quarks and J/psi in the quark gluon plasma is studied within the partonic transport model Boltzmann Approach to MultiParton Scatterings (BAMPS). This framework allows interactions among all…

High Energy Physics - Phenomenology · Physics 2015-06-12 Jan Uphoff , Oliver Fochler , Zhe Xu , Carsten Greiner

The elliptic flow of emitted particles and fragments observed in heavy-ion reactions at high energy has become an important observable reflecting the pressure generated in the dense collision zone. More recently, the strength of the nuclear…

Nuclear Experiment · Physics 2019-08-28 W. Trautmann

We posit a unified hydrodynamic and microscopic description of the quark-gluon plasma (QGP) produced in ultrarelativistic $p$-Pb and Pb-Pb collisions at $\sqrt{s_\mathrm{NN}}=5.02$ TeV and evaluate our assertion using Bayesian inference.…

Nuclear Theory · Physics 2020-02-26 J. Scott Moreland , Jonah E. Bernhard , Steffen A. Bass

Azimuthal and polar angle distributions of particles produced in heavy ion collisions carry important information about the early state of the system and the evolution of the Quark Gluon Plasma. The pixelization code HEALPix was created by…

Nuclear Theory · Physics 2021-12-24 Hannah Anderson , Shengquan Tuo

We present a novel approach to the treatment of thermal fluctuations in the (3+1)-D viscous hydrodynamic simulation MUSIC. The phenomenological impact of thermal fluctuations on hadronic observables is investigated using the IP-Glasma +…

Nuclear Theory · Physics 2019-02-20 Mayank Singh , Chun Shen , Scott McDonald , Sangyong Jeon , Charles Gale

We use a hydrodynamic model to study the space-time evolution transverse to the beam direction in ultrarelativistic heavy-ion collisions with nonzero impact parameters. We focus on the influence of early pressure on the development of…

Nuclear Theory · Physics 2009-10-09 P. F. Kolb , J. Sollfrank , P. V. Ruuskanen , U. Heinz

We introduce a combined macroscopic/microscopic transport approach employing relativistic hydrodynamics for the early, dense, deconfined stage of the reaction and a microscopic non-equilibrium model for the later hadronic stage where the…

Nuclear Theory · Physics 2009-11-06 S. A. Bass , A. Dumitru

We investigate the elliptic and the triangular flow of heavy mesons in ultrarelativistic heavy-ion collisions at RHIC and the LHC. The dynamics of heavy quarks is coupled to the locally thermalized and fluid dynamically evolving quark-gluon…

High Energy Physics - Phenomenology · Physics 2015-06-23 Marlene Nahrgang , Jörg Aichelin , Steffen Bass , Pol Bernard Gossiaux , Klaus Werner

We obtain the initial phase space distribution after relativistic heavy ion collision by the CGC shattering method incorporating the uncertainty principle and solve the semi-classical Boltzmann equation which includes the gluon radiation…

Nuclear Theory · Physics 2015-05-13 Ghi R. Shin

The quark-gluon plasma produced by collisions between ultra-relativistic heavy nuclei is well described in the language of hydrodynamics. Non-central collisions are characterized by very large angular momentum, which in a fluid system…

Nuclear Experiment · Physics 2020-03-10 Francesco Becattini , Michael Lisa

The colliding heavy ions create extremely strong magnetic and electric fields that significantly affect the evolution of the produced quark-gluon plasma (QGP). The knowledge of these fields is essential for establishing the role of…

High Energy Physics - Phenomenology · Physics 2021-02-03 U. Gürsoy , D. E. Kharzeev , E. Marcus , K. Rajagopal , C. Shen

The evolution of a relativistic heavy-ion collision is typically understood as a process that transmutes the initial geometry of the system into the final momentum distribution of observed hadrons, which can be described via a cumulant…

Nuclear Theory · Physics 2024-05-24 Jefferson Sousa , Jorge Noronha , Matthew Luzum

We consider the evolution of a parton plasma created in Au+Au collisions at LHC and at RHIC energies. Using Boltzmann equation, relaxation time approximation and perturbative QCD, we show the physics of both thermal and chemical…

Nuclear Theory · Physics 2007-05-23 S. M. H. Wong

We investigate the influence of a temperature-dependent shear viscosity over entropy density ratio eta/s on the transverse momentum spectra and elliptic flow of hadrons in ultrarelativistic heavy-ion collisions. We find that the elliptic…

Nuclear Theory · Physics 2011-06-27 Harri Niemi , Gabriel S. Denicol , Pasi Huovinen , Etele Molnar , Dirk H. Rischke

Using next-to-leading order perturbative QCD and a conjecture of saturation to suppress the production of low-energy partons, we calculate the initial energy densities and formation times for the dissipative fluid dynamical evolution of the…

High Energy Physics - Phenomenology · Physics 2015-06-17 R. Paatelainen , K. J. Eskola , H. Niemi , K. Tuominen

We investigate the possibility of selecting heavy ion collision events with certain features in the initial state ("event engineering"). Anisotropic flow measurements in heavy ion reactions have confirmed the almost ideal fluid dynamical…

Nuclear Theory · Physics 2013-11-13 Hannah Petersen , Berndt Muller

We predict the elliptic flow parameter v_2 in U+U collisions at sqrt{s_{NN}}=200 GeV and in Pb+Pb collisions at sqrt{s_{NN}} = 2.76 TeV using a hybrid model in which the evolution of the quark gluon plasma is described by ideal…

Nuclear Theory · Physics 2011-02-22 Tetsufumi Hirano , Pasi Huovinen , Yasushi Nara