Jozsó's Legacy: Chemical and kinetic freeze-out in heavy-ion collisions

Abstract.: We review J. Zimányi's key contributions to the theoretical understanding of dynamical freeze-out in nuclear collisions and their subsequent applications to ultra-relativistic heavy-ion collisions, leading to the discovery of a freeze-out hierarchy where chemical freeze-out of hadron yields precedes the thermal decoupling of their momentum spectra. Following Zimányi's lines of reasoning we show that kinetic freeze-out necessarily leads to a dependence of the corresponding freeze-out temperature on collision centrality. This centrality dependence can be predicted within hydrodynamic models, and for Au+Au collisions at RHIC this prediction is shown to reproduce the experimentally observed centrality dependence of the thermal decoupling temperature, extracted from hadron momentum spectra. The fact that no such centrality dependence is observed for the chemical decoupling temperature, extracted from the hadron yields measured in these collisions, excludes a similar kinetic interpretation of the chemical decoupling process. We argue that the chemical decoupling data from Au+Au collisions at RHIC can only be consistently understood if the chemical freeze-out process is driven by a phase transition, and that the measured chemical decoupling temperature therefore measures the critical temperature of the quark-hadron phase transition. We propose additional experiments to further test this interpretatio

Thermal Dileptons at LHC

We predict dilepton invariant-mass spectra for central 5.5 ATeV Pb-Pb collisions at LHC. Hadronic emission in the low-mass region is calculated using in-medium spectral functions of light vector mesons within hadronic many-body theory. In the intermediate-mass region thermal radiation from the Quark-Gluon Plasma, evaluated perturbatively with hard-thermal loop corrections, takes over. An important source over the entire mass range are decays of correlated open-charm hadrons, rendering the nuclear modification of charm and bottom spectra a critical ingredient.Comment: 2 pages, 2 figures, contributed to Workshop on Heavy Ion Collisions at the LHC: Last Call for Predictions, Geneva, Switzerland, 14 May - 8 Jun 2007 v2: acknowledgment include

Early collective expansion: Relativistic hydrodynamics and the transport properties of QCD matter

Relativistic hydrodynamics for ideal and viscous fluids is discussed as a tool to describe relativistic heavy-ion collisions and to extract transport properties of the quark-gluon plasma from experimentally measured hadron momentum spectra.Comment: Review article, 54 pages, 25 figure

Design and Implemention of Cross Debugger for LEON Series Processor

随着嵌入式系统的飞速发展，嵌入式系统开发工具在开发过程中所起的作用日益突出。软件调试是软件开发过程中不可缺少的重要阶段，嵌入式交叉调试器是嵌入式开发者使用最多的工具，对系统底层软件和嵌入式系统的开发尤其重要。其除了要具备传统调试器的断点跟踪、变量查询等基本功能外，还必须具备远程下载、远程调试控制等功能。因此交叉调试器的实现复杂度要远远高于传统调试器。 本文的研究目标是设计并实现一种LEON系列处理器的嵌入式交叉调试器。本课题首先对当今主流的嵌入式交叉调试工具及其实现方法进行了详细的分析，并结合实际情况确定了课题的技术路线和需求。然后对边界扫描协议JTAG、GDB远程调试协议RSP和USB传输...While embedded technology develops rapidly, embedded system development toolkit is a special important component in the embedded system development. Software debugging is an important phase in software developing process. Cross debugger is vital for the development of low-level system software and embedded system. As a debugger for cross development environment, not only cross debugger has traditi...学位：理学硕士院系专业：信息科学与技术学院电子工程系_无线电物理学号：2005130236

Heavy-ion collisions at the LHC - Last call for predictions

This writeup is a compilation of the predictions for the forthcoming Heavy Ion Program at the Large Hadron Collider, as presented at the CERN Theory Institute 'Heavy Ion Collisions at the LHC - Last Call for Predictions', held from 14th May to 10th June 2007.This is a manuscript of an article from Journal of Physics G 35 (2008): 054001, doi: 10.1088/0954-3899/35/5/054001. Posted with permission.</p