Hot Hadronic Matter

The past decade has seen the development of the operational understanding of fun damental interactions within the standard model. This has detoured our attention from the great enigmas posed by the dynamics and collective behavior of strongly interacting particles. Discovered more than 30 years ago, the thermal nature of the hadronic particle spectra has stimulated considerable theoretical effort, which so far has failed to 'confirm' on the basis of microscopic interactions the origins of this phenomenon. However, a highly successful Statistical Bootstrap Model was developed by Rolf Hagedorn at CERN about 30 years ago, which has led us to consider the 'boiling hadronic matter' as a transient state in the trans formation of hadronic particles into their melted form which we call Quark-GIuon-Plasma (QGP). Today, we return to seek detailed understanding of the thermalization processes of hadronic matter, equipped on the theoretical side with the knowledge of the fundamental strong interaction theory, the quantum chromo-dynamics (QCD), and recognizing the im portant role of the complex QCD-vacuum structure. On the other side, we have developed new experimental tools in the form of nuclear relativistic beams, which allow to create rather extended regions in space-time of Hot Hadronic Matter. The confluence of these new and recent developments in theory and experiment led us to gather together from June 27 to July 1, 1994, at the Grand Hotel in Divonne-Ies-Bains, France, to discuss and expose the open questions and issues in our field.

Proceedings of a NATO ARW held in Divonne, France, June 27-July 1, 1994

A Tribute to Rolf Hagedorn.- The Long Way to the Statistical Bootstrap Model.- Entropy for Hadrons.- Statistical Studies of Hadrons.- Hagedorn's Temperature and the Dual Resonance Model: A 25 Year Old Love Affair.- Mass Spectrum of q-Deformed Dual String Theory.- Hagedorn's Reincarnation in String Theory.- Interactive Computer Languages: Past and Future of Sigma.- Deconfinement: Concept, Theory, Test.- Hadronic Matter Equation of State and the Hadron Mass Spectrum.- Deconfinement of Constituent Quarks and the Hagedorn Temperature.- Crystalline Quark-Hadron Phase in Neutron Stars.- A New Effective Model of the Quark-Gluon Plasma with Thermal Parton Masses.- Hadronic Matter with Internal Symmetries and its Consequences: An Expanding Hadronic Gas.- On the Statistics-Changing Phase Transition in Gauge Theories.- Fluctuation Corrections to Bubble Nucleation.- A Finite Temperature String Phase Transition a la Volume Exclusion.- Entropy and Decoherence.- Colored Chaos.- Statistical Properties of Relativistic Quasiparticles.- Quantum Decoherence and Entropy in High-Energy Interaction.- Entropy Production via Particle Production.- Real-Time Thermal Corrections to Pair-Production Processes in Heavy-Ion Collisions.- Pions, Baryons and Entropy in Nuclear Collisions.- Entropy in Heavy Ion Collisions.- High Density QCD and Entropy Production at Heavy Ion Colliders.- About Entropy and Thermalization - A Miniworkshop Perspective.- New Developments in Correlation Studies.- How to Investigate Small Collective Signals in Nucleus-Nucleus Interactions.- Negative Binomial Fits to Multiplicity Distributions from Central Collisions of 16O+Cu at 14.6A GeV/c and Intermittency.- Universal Properties of Angular Correlations in QCD Jets.- Towards a Field Theoretical Description ofMultiparticle Production in High Energy Collisions.- Intermittency and Other Scaling Behaviors in Nuclear Collisions.- QCD Generalised Factorial Moments.- Boson Spectra and Correlations in Small Thermalized Systems.- Correlations and Strong Interactions.- Analysis of Multiparticle Correlations and the Wavelet Transform.- Multiparticle Production: Session Summary.- Single Photon Production in 200 A-GeV Sulphur on Gold Collisions.- Latest Results on Dilepton Production in 200 GeV A Ion-Ion Collisions.- Dilepton Spectra in Heavy Ion Collisions.- Photon Multiplicity Measurement, a Novel Observable in High Energy Heavy Ion Collision.- Density Modification of Dilepton Production in Hot Hadronic Matter.- Miniworkshop on Strangeness.- Similarities and Differences in Strangeness Production at BNL and CERN.- Particle Spectra.- Pion and Kaon Freezeout in NA44.- The Dual Parton Model and Hadron Production at Cosmic Ray Energies.- Particle Production at the AGS.- Chemical Equilibrium and Particle Production in Nucleus-Nucleus Collisions at AGS Energy.- Measurement of the ?/? Production Ratio in Central S-W Interactions at 200 A GeV/c.- NA36 Strangeness Production: Multistrange Baryons.- Estimates of the Ratios $$overline Lambda /Lambda ,overline Xi /Xi$$ and $$overline Omega /Omega$$ from pp and pA Interactions.- Thermalisation in High Energy Heavy Ion Collisions and Strange Particle Production.- Strangeness in Hot Hadronic Matter.- Hadronic Physics: The Cosmic Ray Perspective.- Minimax: Progress and Plans.- Event by Event Analysis of Ultrarelativistic Nuclear Collisions: A New Method to Search for Critical Fluctuations.- Observing Strangeness (and Charm?) in Heavy Ion Interactions.- The Physics and Experimental Program of the Relativistic Heavy Ion Collider(RHIC).- Heavy Ion Physics at the Large Hadron Collider at CERN.- The Hadronic Future.- Contributors.