Florian Senzel

Elliptic flow and nuclear modification factor in ultrarelativistic heavy-ion collisions within a partonic transport model.

The quark gluon plasma produced in ultrarelativistic heavy-ion collisions exhibits remarkable features. It behaves like a nearly perfect liquid with a small shear viscosity to entropy density ratio and leads to the quenching of highly energetic particles. We show that both effects can be understood for the first time within one common framework. Employing the parton cascade Boltzmann approach to multiparton scatterings, the microscopic interactions and the space-time evolution of the quark gluon plasma are calculated by solving the relativistic Boltzmann equation. Based on cross sections obtained from perturbative QCD with explicitly taking the running coupling into account, we calculate the nuclear modification factor and elliptic flow in ultrarelativistic heavy-ion collisions. With only one single parameter associated with coherence effects of medium-induced gluon radiation, the experimental data of both observables can be understood on a microscopic level. Furthermore, we show that perturbative QCD interactions with a running coupling lead to a sufficiently small shear viscosity to entropy density ratio of the quark gluon plasma, which provides a microscopic explanation for the observations stated by hydrodynamic calculations.

Influence of multiple in-medium scattering processes on the momentum imbalance of reconstructed di-jets

Experimental data measured in Pb + Pb collisions at the LHC show a significant enhancement of events with an unbalanced pair of reconstructed jet momenta in comparison with p + p collisions. This enhancement of momentum imbalance is supposed to be caused by the different momentum loss of the initial back-to-back di-partons by scatterings within the created dense medium. For investigating the underlying partonic momentum loss we employ the on-shell transport model Bamps () for full heavy-ion collisions, which numerically solves the 3 + 1D Boltzmann equation based on as well as inelastic scattering processes, together with Pythia initial state conditions for the parton showers. Due to the employed test-particle approach jet reconstruction within Bamps events is not trivial. We introduce a method that nevertheless allows the microscopic simulation of the full evolution of the shower particles, recoiled medium particles, and the underlying bulk medium in one common microscopic framework. With this method it is possible to investigate the role of the medium recoil for the momentum imbalance AJ while using well-established background subtraction algorithms. Due to the available particle information in configuration as well as momentum space within Bamps, it is additionally possible to reproduce the entire evolution of the reconstructed jets within the medium. With this information we investigate the sensitivity of the jet momentum loss from the difference in the partonic in-medium path lengths.

Glueballs amass at the RHIC and LHC! the early quarkless first-order phase transition at T = 270 MeV - From pure Yang-Mills glue plasma to Hagedorn glueball states

The early stage of high multiplicity pp, pA and AA collider is represented by a nearly quarkless, hot, deconfined pure gluon plasma. According to pure Yang-Mills Lattice Gauge Theory, this hot pure glue matter undergoes, at a high temperature,

Momentum imbalance ofDmesons in ultrarelativistic heavy-ion collisions at the CERN Large Hadron Collider

T_c = 270

The different energy loss mechanisms of inclusive and b-tagged reconstructed jets within ultra-relativistic heavy-ion collisions

MeV, a first order phase transition into a confined Hagedorn-GlueBall fluid. These new scenario should be characterized by a suppression of high

Nonequilibrium photon production in partonic transport simulations

p_T

Review of the State-of-the-Art Development of the Spherical Theta Pinch Plasma Source

photons and dileptons, baryon suppression and enhanced strange meson production. We propose to observe this newly predicted class of events at LHC and RHIC.

The parton cascade BAMPS with the improved Gunion-Bertsch matrix element

As a new observable for heavy flavor correlations the momentum imbalance

Quark gluon plasma studies within a partonic transport approach

A_D

The spherical theta pinch and its applications

of D mesons is proposed. It is defined analogously to the jet momentum imbalance