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The very strong electromagnetic fields present in ultraperipheral relativistic heavy ion collisions lead to important higher order effects of the electromagnetic interaction. These multiphoton exchange processes are studied using…

Nuclear Theory · Physics 2014-11-18 Gerhard Baur , Kai Hencken , Andreas Aste , Dirk Trautmann , Spencer R. Klein

Heavy-ion collisions provide a window into the properties of many-body systems of deconfined quarks and gluons. Understanding the collective properties of quarks and gluons is possible by comparing models of heavy-ion collisions to…

Nuclear Theory · Physics 2025-02-06 Jean-François Paquet

We study the transverse momentum spectra of identified particles in ultrarelativistic collisions of large and small collision systems. In order to isolate information contained in the momentum dependence, we propose to scale the spectra by…

The transverse momentum spectra and their multiplicity dependence serve as key tools for extracting parameters to be compared with theoretical models. Over the past decade, the scientific community has extensively studied the possibility of…

High Energy Physics - Phenomenology · Physics 2025-06-23 Gábor Bíró , Leonid Serkin , Guy Paić , Gergely Gábor Barnaföldi

By measuring hadronic single-particle spectra and two-particle correlations in heavy-ion collisions, the size and dynamical state of the collision fireball at freeze-out can be reconstructed. I discuss the relevant theoretical methods and…

Nuclear Theory · Physics 2007-05-23 Ulrich Heinz

Posterior distributions for physical parameters describing relativistic heavy-ion collisions, such as the viscosity of the quark-gluon plasma, are extracted through a comparison of hydrodynamic-based transport models to experimental results…

Nuclear Theory · Physics 2015-06-15 John Novak , Kevin Novak , Scott Pratt , J. Vredevoogd , Chris Coleman-Smith , Robert Wolpert

A model with non-uniform flow in the longitudinal direction is proposed for the relativistic heavy-ion collisions and compared with the 14.6 A GeV/c Si-Al and 10.8 A GeV/c Au-Au collision data. The stronger influence of transparency on the…

High Energy Physics - Phenomenology · Physics 2007-05-23 Shengqin FENG , Feng LIU , Lianshou LIU

Four models for the initial conditions of a fluid dynamic description of high energy heavy ion collisions are analysed and compared. We study expectation values and event-by-event fluctuations in the initial transverse energy density…

High Energy Physics - Phenomenology · Physics 2020-12-01 Stefan Floerchinger , Eduardo Grossi , Kianusch Vahid Yousefnia

Cross sections for proton inelastic collision with different nuclei are described within the Glauber and multiple scattering approximations. A significant difference between approximate `Glauber' formula and exact calculations with a…

High Energy Physics - Phenomenology · Physics 2008-11-26 Tadeusz Wibig , Dorota Sobczynska

We discuss modification in the rapidity distribution of the transverse energy flow as a signal of medium-induced partonic energy loss in ultrarelativistic heavy ion collisions. A scan of the global energy flow and jet rates in the wide…

High Energy Physics - Phenomenology · Physics 2016-09-06 I. P. Lokhtin , S. V. Shmatov , P. I. Zarubin

Complete characterization of particle production and emission in relativistic heavy-ion collisions is in general not feasible experimentally. This work demonstrates, however, that the availability of essentially complete pseudorapidity…

Nuclear Experiment · Physics 2009-11-11 B. B. Back

Particles produced in heavy ion collisions carry information about anisotropies present already in the early state of the system and play a crucial role in understanding the Quark Gluon Plasma and its evolution. We explore the angular power…

High Energy Physics - Phenomenology · Physics 2019-06-05 Meera Machado , Poul Henrik Damgaard , Jens Jørgen Gaardhøje , Christian Bourjau

In these two lectures I review the basics of heavy-ion collisions at relativistic energies and the physics we can do with them. I aim to cover the basics on the kinematics and observables in heavy-ion collider experiments, the basics on the…

Nuclear Theory · Physics 2020-04-30 Maria Elena Tejeda-Yeomans

Application of hydrodynamics for modeling of heavy-ion collisions is reviewed. We consider several physical observables that can be calculated in this approach and compare them to the experimental measurements.

Nuclear Theory · Physics 2008-11-26 P. Huovinen , P. V. Ruuskanen

A model in which a projectile like fragment can be simply regarded as a remnant after removal of some part of the projectile leads to an excited fragment. This excitation energy can be calculated with a Hamiltonian that gives correct…

Nuclear Theory · Physics 2015-06-15 S. Das Gupta , S. Mallik , G. Chaudhuri

A direct method to reconstruct the transverse structure of the baryon source formed in a relativistic heavy ion collision is presented. The procedure makes use of experimentally measured proton and deuteron spectra and assumes that…

Nuclear Theory · Physics 2009-10-31 A. Polleri , R. Mattiello , I. N. Mishustin , J. P. Bondorf

We investigate a scaling property of transverse-momentum spectra in ultrarelativistic heavy-ion collisions obtained by removing the global scales of multiplicity and mean transverse momentum. The resulting dimensionless observable isolates…

Nuclear Theory · Physics 2026-03-18 Thiago S. Domingues , Matthew Luzum

In order to describe large transverse momentum ($p_T$) distributions observed in high energy nucleus-nucleus collisions, a stochastic model in the three dimensional rapidity space is introduced. The fundamental solution of the radial…

High Energy Physics - Phenomenology · Physics 2015-06-25 Naomichi Suzuki , Minoru Biyajima

Based on the factorization in perturbative QCD, a jet cross sections in heavy-ion collisions can be expressed as a convolution of the jet cross section in $p+p$ collisions and a jet energy loss distribution. Using this simple expression and…

High Energy Physics - Phenomenology · Physics 2019-07-03 Yayun He , Long-Gang Pang , Xin-Nian Wang

Single-particle radiative mechanism of $\gamma$ emission embedded into the pre-equilibrium exciton model is used to calculate the $\gamma$ emission from a decay of $^{160}$Er$^{*}$ created in two different ways. The initial stage of a…

Nuclear Theory · Physics 2007-05-23 E. Betak