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Search Results: 1 - 10 of 516 matches for " Tetsufumi Hirano "
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Relativistic Hydrodynamics at RHIC and LHC
Hirano, Tetsufumi
High Energy Physics - Phenomenology , 2007, DOI: 10.1143/PTPS.168.347
Abstract: Recent development of a hydrodynamic model is discussed by putting an emphasis on realistic treatment of the early and late stages in relativistic heavy ion collisions. The model, which incorporates a hydrodynamic description of the quark-gluon plasma with a kinetic approach of hadron cascades, is applied to analysis of elliptic flow data at the Relativistic Heavy Ion Collider energy. It is predicted that the elliptic flow parameter based on the hybrid model increases with the collision energy up to the Large Hadron Collider energy.
Elliptic Flow Based on a Relativistic Hydrodynamic Model
Tetsufumi Hirano
Physics , 1999,
Abstract: Based on the (3+1)-dimensional hydrodynamic model, the space-time evolution of hot and dense nuclear matter produced in non-central relativistic heavy-ion collisions is discussed. The elliptic flow parameter v_2 is obtained by Fourier analysis of the azimuthal distribution of pions and protons which are emitted from the freeze-out hypersurface. As a function of rapidity, the pion and proton elliptic flow parameters both have a peak at midrapidity.
Hydrodynamic analysis of heavy ion collisions at RHIC
Tetsufumi Hirano
Physics , 2008, DOI: 10.1088/0954-3899/36/6/064031
Abstract: Current status of dynamical modeling of relativistic heavy ion collisions and hydrodynamic description of the quark gluon plasma is reported. We find the hadronic rescattering effect plays an important role in interpretation of mass splitting pattern in the differential elliptic flow data observed at RHIC. To demonstrate this, we predict the elliptic flow parameter for phi mesons to directly observe the flow just after hadronisation. We also discuss recent applications of outputs from hydrodynamic calculations to J/psi suppression, thermal photon radiation and heavy quark diffusion.
What can we learn from hydrodynamic analysis of elliptic flow?
Tetsufumi Hirano
Physics , 2005, DOI: 10.1016/j.nuclphysa.2006.06.025
Abstract: We can establish a new picture, the perfect fluid sQGP core and the dissipative hadronic corona, of the space-time evolution of produced matter in relativistic heavy ion collisions at RHIC. It is also shown that the picture works well also in the forward rapidity region through an analysis based on a new class of the hydro-kinetic model and is a manifestation of deconfinement.
Hydrodynamic models
Tetsufumi Hirano
Physics , 2004, DOI: 10.1088/0954-3899/30/8/025
Abstract: Recent developments based on relativistic hydrodynamic models in high energy heavy ion collisions are discussed. I focus especially on how hydrodynamics works at RHIC energies and how one can use the most of it in analyses of jet quenching and thermal electromagnetic radiations. I also comment on improvement of initial conditions and viscosity in hydrodynamic models.
Hydrodynamic Approaches to Relativistic Heavy Ion Collisions
Tetsufumi Hirano
Physics , 2004,
Abstract: We give a short review about the hydrodynamic model and its application to the elliptic flow phenomena and the pion interferometry in relativistic heavy ion collisions.
In-Plane Elliptic Flow of Resonance Particles in Relativistic Heavy-Ion Collisions
Tetsufumi Hirano
Physics , 2000, DOI: 10.1103/PhysRevLett.86.2754
Abstract: We analyze the second Fourier coefficient $v_2$ of the pion azimuthal distribution in non-central heavy-ion collisions in a relativistic hydrodynamic model. The exact treatment of the decay kinematics of resonances leads to almost vanishing azimuthal anisotropy of pions near the midrapidity, while the matter elliptic flow is in-plane at freeze-out. In addition, we reproduce the rapidity dependence of $v_2$ for pions measured in non-central Pb + Pb collisions at 158$A$ GeV. This suggests that resonance particles as well as stable particles constitute the in-plane flow and are important ingredients for the understanding of the observed pion flow.
Is early thermalization achieved only near midrapidity at RHIC ?
Tetsufumi Hirano
Physics , 2001, DOI: 10.1103/PhysRevC.65.011901
Abstract: The pseudorapidity dependence of elliptic flow in Au+Au collisions at 130 $A$ GeV is studied within a full three-dimensional hydrodynamic model in the light-cone coordinate. First, we prepare two initial conditions in the hydrodynamic model for analyzing elliptic flow. Both initial conditions lead to reasonable agreement with single particle spectra in central and semi-central collisions. Next, by using these hydrodynamic simulations, we compare elliptic flow as a function of pseudorapidity with experimental data recently measured by the PHOBOS Collaboration. Our results are in agreement with experimental data only near midrapidity. This suggests that thermalization in the early stage of collisions is not achieved in forward and backward rapidity regions.
Theory Summary
Tetsufumi Hirano
Physics , 2014, DOI: 10.1016/j.nuclphysa.2014.02.006
Abstract: In this review, I show a personal overview of theoretical results shown in the International Conference on the Initial Stages in High-Energy Nuclear Collision, in Illa da Toxa, Galicia, Spain, Sept.~8-14, 2013.
Relativistic Hydrodynamics at RHIC and LHC
Tetsufumi Hirano
Physics , 2007, DOI: 10.1143/PTPS.168.347
Abstract: Recent development of a hydrodynamic model is discussed by putting an emphasis on realistic treatment of the early and late stages in relativistic heavy ion collisions. The model, which incorporates a hydrodynamic description of the quark-gluon plasma with a kinetic approach of hadron cascades, is applied to analysis of elliptic flow data at the Relativistic Heavy Ion Collider energy. It is predicted that the elliptic flow parameter based on the hybrid model increases with the collision energy up to the Large Hadron Collider energy.
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