Author: Jose GoityPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Chemical Relaxation Times in a Hadron Gas at Finite Temperature
Author: Jose GoityChemical Relaxation Times in a Hadron Gas at Finite Temperature
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
The relaxation time of particle numbers in hot hadronic matter with vanishing baryon number are estimated using the ideal gas approximation and taking into account resonance decays and annihilation processes as the only sources of particle number fluctuations. Near the QCD critical temperature the longest relaxation times turn out to be of the order of 10 fm and grow roughly exponentially to become of the order of 10^3 fm at temperatures around 100 MeV. As a consequence of such long relaxation times, a clear departure from chemical equilibrium must be observed in the momentum distribution of secondary particles produced in high energy nuclear collisions.
High Energy Physics Index
Author: Publisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 660
Book Description
Physics Briefs
Author: Hadrons at Finite Temperature
Author: Samirnath MallikPublisher:
ISBN: 9781108114721
Category : SCIENCE
Languages : en
Pages :
Book Description
"High energy laboratories are performing experiments in heavy ion collisions to explore the structure of matter at high temperature and density. This elementary book explains the basic ideas involved in the theoretical analysis of these experimental data. It first develops two topics needed for this purpose, namely hadron interactions and thermal field theory. Chiral perturbation theory is developed to describe hadron interactions and thermal field theory is formulated in the real-time method. In particular, spectral form of thermal propagators is derived for fields of arbitrary spin and used to calculate loop integrals. These developments are then applied to find quark condensate and hadron parameters in medium, including dilepton production. Finally, the non-equilibrium method of statistical field theory to calculate transport coefficients is reviewed. With technical details explained in the text and appendices, this book should be accessible to researchers as well as graduate students interested in thermal field theory"--
Chemical Abstracts
Author: Hadron Thermodynamics from Imaginary Chemical Potentials
Author: Attila PásztorPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
We use 4stout improved staggered lattice data at imaginary chemical potentials to calculate fugacity expansion coefficients in finite temperature QCD. We discuss the phenomenological interpretation of our results within the hadron resonance gas (HRG) model, and the hints they give us about the hadron spectrum. We also discuss features of the higher order coefficients that are not captured by the HRG. This conference contribution is based on our recent papers [1, 2].
Hadron Production at RHIC - Chemical Freeze-out, Effective Masses and Expanding Matter
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
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.
Australian Journal of Physics
Author: XXIII DAE High Energy Physics Symposium
Author: Prafulla Kumar BeheraPublisher: Springer Nature
ISBN: 9813344083
Category : Science
Languages : en
Pages : 1143
Book Description
This volume presents the peer-reviewed proceedings of the XXIII DAE-BRNS High Energy Physics Symposium 2018, which was held at the Indian Institute of Technology Madras, India, on 10-15 December 2018. Gathering selected contributions, the book highlights the latest developments and research trends in physics, detectors and instrumentation relevant to all branches of particle physics, astroparticle physics and closely related fields. The major topics covered include Standard Model physics, beyond Standard Model physics, neutrino physics, cosmology, formal theory, heavy ion physics & quantum chromodynamics (QCD), particle detectors and future experiments. Given the range of topics discussed, the book will be useful for beginners as well as advanced researchers in the field.