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Author: Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
The properties of the strongly interacting matter produced at RHIC are investigated within a chemical and thermal equilibrium chiral SU(3) [sigma]-[omega] approach. The focus is on the freeze-out conditions, the effective masses for the produced hadrons and the expansion of the system. For the freeze-out conditions the commonly adopted noninteracting gas calculations yield temperatures and chemical potentials close to or above the critical temperature for the chiral phase transition, but without taking into account any interactions. Contrary, the chiral SU(3) model predicts temperature and density dependent effective hadron masses and effective chemical potentials in the medium and a transition to a chirally restored phase at high temperatures or chemical potentials. Three different parametrizations of the model, which show different types of phase transition behavior, are investigated. They show that if a chiral phase transition occurred in those collisions, freezing of the relative hadron abundances in the symmetric phase is excluded by the data. Therefore, either very rapid chemical equilibration must occur in the broken phase, or the measured hadron ratios are the outcome of the dynamical symmetry breaking. Furthermore, the extracted chemical freeze-out parameters differ considerably from those obtained in simple noninteracting gas calculations. In particular, the three models yield up to 35 MeV lower temperatures than the free gas approximation. The in-medium masses turn out differ up to 150 MeV from their vacuum values.
Author: Publisher: ISBN: Category : Languages : en Pages : 5
Book Description
The properties of the strongly interacting matter produced at RHIC are investigated within a chemical and thermal equilibrium chiral SU(3) [sigma]-[omega] approach. The focus is on the freeze-out conditions, the effective masses for the produced hadrons and the expansion of the system. For the freeze-out conditions the commonly adopted noninteracting gas calculations yield temperatures and chemical potentials close to or above the critical temperature for the chiral phase transition, but without taking into account any interactions. Contrary, the chiral SU(3) model predicts temperature and density dependent effective hadron masses and effective chemical potentials in the medium and a transition to a chirally restored phase at high temperatures or chemical potentials. Three different parametrizations of the model, which show different types of phase transition behavior, are investigated. They show that if a chiral phase transition occurred in those collisions, freezing of the relative hadron abundances in the symmetric phase is excluded by the data. Therefore, either very rapid chemical equilibration must occur in the broken phase, or the measured hadron ratios are the outcome of the dynamical symmetry breaking. Furthermore, the extracted chemical freeze-out parameters differ considerably from those obtained in simple noninteracting gas calculations. In particular, the three models yield up to 35 MeV lower temperatures than the free gas approximation. The in-medium masses turn out differ up to 150 MeV from their vacuum values.
Author: Csar A. Z. Vasconcellos Publisher: World Scientific ISBN: 9812381929 Category : Science Languages : en Pages : 552
Book Description
This book provides in a pedogogical way up-to-date reviews of analytical approaches to QCD, high-energy astrophysics, QGP signatures and high-precision lattice QCD. It also contains presentations about experimental work on heavy-ion physics at RHIC and diffraction at HERA as well as communications on hadron physics.
Author: Bardo E J Bodmann Publisher: World Scientific ISBN: 9814487260 Category : Science Languages : en Pages : 552
Book Description
This book provides in a pedagogical way some up-to-date reviews of properties of strongly interacting matter produced at RHIC, analytical approaches to QCD, and nuclear and high-energy astrophysics. It also contains schematic outlines of topics on high-precision non-perturbative QCD, first results from RHIC, and heavy-ion collisions at LHC with the ATLAS detector.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)
Author: Sigfrido Boffi Publisher: Springer Science & Business Media ISBN: 364218801X Category : Science Languages : en Pages : 287
Book Description
This volume contains the invited and contributed papers presented at the Fourth International Conference on Perspectives in Hadronic Physics and sent to the Editors within the deadline. The Conference was held at the Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy, from May 12th to 16th, 2003, and was attended by about 100 scientists from 20 countries. The series ofConferences on Perspectives on Hadronic Physics takes place every two years since 1997 and follows the seven Workshops on Perspectives in Nuclear Physics at Intermediate Energies, organized every two years at ICTP since 1983. The aim of these Conferences is to discuss the status-of-the-art concerning the experimental and theoretical investigations of hadronic systems, from nucleons to nuclei and dense nuclear matter, in terms of the relevant underlying degrees of freedom. For such a reason the Fourth Conference has been focused on those experimental and theoretical topics which have been in the last few years the object of intensive investigations, viz. the various approaches employed to describe the structure of hadrons in terms of QCD and QCD inspired models, the recent developments in the treatment of the properties and propagations of hadronic states in the medium, the relevant progress done in the solution of the few- and many- hadron problems, the recent results in the experimental investigation of dense hadronic matter and, last but not least, the physics programs of existing Laboratories and the suggested projects for new Facilities.
Author: Rudolph C. Hwa Publisher: CRC Press ISBN: 9782881247347 Category : Science Languages : en Pages : 338
Book Description
Papers of the June 1989 meeting in Beijing by the China Center of Advanced Science and Technology. This small book covers nucleus- nucleus collisions, states of the vacuum, and highly relativistic heavy ions in the experimental realm. Theoretical papers deal with quark-gluon plasma, and relativistic heavy ion collisions. Annotation copyrighted by Book News, Inc., Portland, OR
Author: A.H. Blin Publisher: American Institute of Physics ISBN: 9780735401204 Category : Science Languages : en Pages : 424
Book Description
New theories are explored and discussed on establishing relations between the fundamental theory of strong interactions, known as QCD, and experiment. Powerful theoretical models, known as effective theories, based on symmetries of QCD, have been developed to address the non-perturbative regime of QCD in an approximate, yet quantitatively controllable way. The present workshop focussed on the most recent developments in this area. New results on meson and baryon physics are discussed as well and new directions towards the possible experimental confirmation of nuclear/quark matter and quark-gluon plasma are indicated.
Author: Rudolph C. Hwa Publisher: World Scientific ISBN: 9812795537 Category : Science Languages : en Pages : 786
Book Description
Annotation. Text reviews the major topics in Quark-Gluon Plasma, including: the QCD phase diagram, the transition temperature, equation of state, heavy quark free energies, and thermal modifications of hadron properties. Includes index, references, and appendix. For researchers and practitioners.
Author: Nora Serafina Brambilla Publisher: World Scientific ISBN: 9814485810 Category : Science Languages : en Pages : 551
Book Description
This book provides an update on our understanding of strong interaction, with theoretical and experimental highlights included. It is divided into five sections. The first section is devoted to the investigations into and the latest results on the mechanism of quark confinement. The second and third sections focus respectively on light and heavy quarks (effective field theories, Schwinger-Dyson approach and lattice QCD results). The fourth section deals with the deconfinement mechanism and quark-gluon plasma formation signals. The last section presents highlights of experiments, new physics beyond QCD, and nonperturbative approaches in other theories (strings and SUSY) that may be useful in QCD.
Author: N. Brambilla Publisher: World Scientific ISBN: 9812704264 Category : Science Languages : en Pages : 551
Book Description
This book provides an update on our understanding of strong interaction, with theoretical and experimental highlights included. It is divided into five sections. The first section is devoted to the investigations into and the latest results on the mechanism of quark confinement. The second and third sections focus respectively on light and heavy quarks (effective field theories, SchwingerOCoDyson approach and lattice QCD results). The fourth section deals with the deconfinement mechanism and quarkOCogluon plasma formation signals. The last section presents highlights of experiments, new physics beyond QCD, and nonperturbative approaches in other theories (strings and SUSY) that may be useful in QCD."
Author: 
Author: 
Author: Csar A. Z. Vasconcellos
Author: Bardo E J Bodmann
Author: Detlef Zschiesche
Author: Sigfrido Boffi
Author: Rudolph C. Hwa
Author: A.H. Blin
Author: Rudolph C. Hwa
Author: Nora Serafina Brambilla
Author: N. Brambilla