Photon Production and Photon-Hadron Correlations in Relativistic Heavy Ion Collisions
Charles Gale
备注:
4 pages, 2 figures, Talk given at the Tenth Conference on the Intersections of Particle and Nuclear Physics (CIPANP 2009), San Diego, CA, 26 May to 31 May, 2009
We calculate the production of real photons in relativistic nuclear collisions at RHIC, consistently with the quenching of fast partons. We go beyond one-body observables, and evaluate photon-triggered fragmentation functions, in the kinematical window corresponding to that of experimental measurements.
Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
采用超相对论量子分子动力学方法(UrQMD)研究高能强子-强子碰撞。这个微观输运模型被设计用来研究pp,pA和A + A碰撞。它描述了强子相互作用的现象学在低和中等能量($\sqrt s <5$ GeV)在已知的强子和它们的共振之间的相互作用。在高能量($\sqrt s >5$ GeV)下,色弦的激发及其随后分裂成强子主导了UrQMD模型中粒子的多重产生。该模型显示了一个公平的整体协议与大量的实验氢数据在很宽的范围内的氢氢质心能量。更高精度的强子反应数据将有助于支持UrQMD模型在相对论性重离子碰撞中的应用。
Relativistic corrections to hadron-hadron correlation function
University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);Tianjin University(天津大学);GSI Helmholtz Center for Heavy Ion Physics(重离子物理GSI亥姆霍兹中心);Johann Wolfgang Goethe-Universität(约翰·沃尔夫冈·歌德大学)
Nucleus-nucleus collisions offer a great opportunity for analyzing and determining the intrinsic nature of heavy and exotic hadrons. In this sense, here we discuss how the production and dissociation of hadron states are affected by reactions during the expansion of hadronic matter in a heavy-ion collision environment. We give emphasis to recent works on exotic states, revisiting as a case study the time evolution of the abundances of the $X_{0,1}(2900)$ states.
A brief introduction to the statistical hadronization approach to particle production in relativistic heavy-ion collisions is given. In the context of fluid dynamics modeling various aspects of hadron emission at the freeze-out are discussed. Practical applications of the presented concepts are presented within the THERMINATOR Monte-Carlo hadron generator.
Heavy flavor supplies a chance to constrain and improve the hadronization mechanism. We have established a sequential coalescence model with charm conservation and applied it to the charmed hadron production in heavy ion collisions. The charm conservation enhances the earlier hadron production and suppresses the later production. This relative enhancement (suppression) changes significantly the ratios between charmed hadrons in heavy ion collisions.
A systematic study of global spin polarizations and correlations of hadrons with different spins in relativistic heavy ion collisions
Institute of Frontier and Interdisciplinary Science, Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University(山东大学前沿交叉科学研究中心,粒子物理与粒子辐照教育部重点实验室)
We compare the reconstructed hadronization conditions in relativistic nuclear collisions in the nucleon-nucleon centre-of-mass energy range 4.7-2760 GeV in terms of temperature and baryon-chemical potential with lattice QCD calculations, by using hadronic multiplicities. We obtain hadronization temperatures and baryon chemical potentials with a fit to measured multiplicities by correcting for the effect of post-hadronization rescattering. The post-hadronization modification factors are calculated by means of a coupled hydrodynamical-transport model simulation under the same conditions of appro…
Production rates for hadrons, pentaquarks $Θ^+$ and $Θ^{*++}$, and di-baryon $(ΩΩ)_{0^{+}}$ in relativistic heavy ion collisions by a quark combination model
We develop a flexible, relativistically covariant parameterization of dense nuclear matter equation of state suited for inclusion in computationally demanding hadronic transport simulations. Within an implementation in the hadronic transport code SMASH, we show that effects due to bulk thermodynamic behavior are reproduced in dynamic hadronic systems, demonstrating that hadronic transport can be used to study critical behavior in dense nuclear matter, both at and away from equilibrium. We also show that two-particle correlations calculated from hadronic transport simulation data follow theoret…
It was proposed that the electric fields may lead to chiral separation in QGP, which is called the chiral electric separation effect. The strong electromagnetic field and the QCD vacuum can both completely be produced in the off-central nuclear-nuclear collision. We used the Wood-Saxon nucleon distribution to calculate the electric field distributions of the off-central collisions. The chiral electro field spatial distribution at Relativistic Heavy-Ion Collider (RHIC) and Large Hadron Collider (LHC) energy regions are systematically studied in this paper. Compared with magnetic field spatial d…
Parton-Hadron-String Dynamics: an off-shell transport approach for relativistic energies
本文采用新的部分子-强子-弦动力学(PHSD)输运方法分析了相对论性核-核碰撞中部分子、强子和弦的动力学,并将其应用于20 ~ 160 A GeV的Pb+Pb碰撞,以探索“部分子物质”的时空区域。我们发现,即使是在158 A GeV的顶部SPS能量的中心碰撞显示了很大一部分的非部分子,即强子或弦状物质,这可以被视为强子日冕。此外,我们观察到,部分子相位有一个很小的影响,强子的快度分布,但相当大的影响,由于排斥部分子平均场的横向质量分布的最终K介子。我们还发现了一个显着的影响,由于轻微增强的$s{\bar s}$对生产的部分子阶段,从大量的类时胶子衰变和更大的反重子形成的强子化过程。所有的微分强子谱进行了分析比较的实验合作的数据。