Jean Letessier

Strangeness enhancement at LHC (2008)

We present a detailed analysis of the NA49 experimental particle yield results, and discuss the physical properties of the particle source. We explain in depth how our analysis differs from the work...

Strangeness and threshold of phase changes (2008)

We study production of strangeness in the hot QGP fireball in conditions achieved at LHC, and use these results to obtain soft (strange) hadron multiplicities. We compare the chemical equilibrium and...

Rafelski, Johann, Kuznetsova, Inga, Letessier, Jean

We explore entropy and strangeness as signature of QGP for top AGS energy and the energy scan at SPS. We find that the hadronization dynamics changes between 20 and 30 $A$ GeV projectile energy. The...

Some results on co-recursive associated Meixner and Charlier polynomials (2007)

Charlier Polynomials, Jean Letessier

An explicit representation of the co-recursive associated Meixner polynomials is given in terms of hypergeometric functions. This representation allows to derive a generating function, the Stieltjes...

Status of Strangeness-Flavor Signature of QGP (2006)

Strangeness Chemical Equilibration in QGP at RHIC and LHC (2006)

Is the new state of matter formed in relativistic heavy ion collisions the deconfined quark--gluon plasma? We survey the status of several strange hadron observables and discuss how these measurement...

Centrality dependence of strangeness and (anti)hyperon production at BNL RHIC (2006)

We study, in the dynamically evolving QGP fireball formed in relativistic heavy ion collisions at RHIC and LHC, the growth of strangeness yield toward and beyond the chemical equilibrium. We account...

Soft Hadron Ratios at the LHC (2006)

We evaluate strangeness produced in Au--Au interactions at $\sqrt{s_{\rm NN}}=200$ GeV, as function of reaction participant number $A$, and obtain the relative strange quark content at hadronization....

Strangeness and thresholds of phase changes in relativistic heavy ion collisions (2006)

High precision soft hadron abundance data produced in relativistic nuclear collisions at LHC at $\sqrt{s_{\rm NN}}\le 5500$ GeV will become available beginning in 2007/8. We explore, within the...

Centrality Dependence of Bulk Fireball Properties at RHIC (2006)

We discuss how the dynamics of the evolving hot fireball of quark--gluon matter impacts phase transition between the deconfined and confined state of matter. The rapid expansion of the fireball of...

Rafelski, Johann, Letessier, Jean, Torrieri, Giorgio

We explore the centrality dependence of properties of the dense hadronic matter created in \sqrt{s_{NN}}=200 GeV Au--Au collisions at RHIC. Using the statistical hadronization model we fit particle...

SHARE: Statistical Hadronization with Resonances (2006)

Torrieri, Giorgio, Steinke, Steve, Broniowski, Wojciech, Florkowski, Wojciech, Letessier, Jean, Rafelski, Johann

SHARE is a collection of programs designed for the statistical analysis of particle production in relativistic heavy-ion collisions. With the physical input of intensive statistical parameters, it...

Statistical hadronization with resonances (2006)

Torrieri, Giorgio, Letessier, Jean, Rafelski, Johann, Steinke, Steve

We introduce the equilibrium and non-equilibrium statistical hadronization picture of particle production in ultra-relativistic heavy ion collisions. We describe the related physical reaction...

Strangeness Excitation Function in Heavy Ion Collisions (2006)

Strangeness and Statistical Hadronization: How to Study Quark-Gluon Plasma (2006)

We study as function of energy strangeness created in relativistic heavy ion collisions. We consider statistical hadronization with chemical freeze-out in both equilibrium and nonequilibrium. We...

Strangeness Chemical Equilibration in QGP at RHIC and LHC (2006)

Statistical hadronization is presented as mechanism for (strange) particle production from a deconfined quark--gluon plasma (QGP) fireball. We first consider hadronic resonance production at RHIC as...

Centrality dependence of strangeness and (anti)hyperon production at BNL RHIC (2006)

We study, in the dynamically evolving QGP fireball formed in relativistic heavy ion collisions at RHIC and LHC, the growth of strangeness yield toward and beyond the chemical equilibrium. We account...

Soft Hadron Ratios at the LHC (2006)

We evaluate strangeness produced in Au--Au interactions at $\sqrt{s_{\rm NN}}=200$ GeV, as function of reaction participant number $A$, and obtain the relative strange quark content at hadronization....

Strangeness Chemical Equilibration in QGP at RHIC and LHC (2006)

High precision soft hadron abundance data produced in relativistic nuclear collisions at LHC at $\sqrt{s_{\rm NN}}\le 5500$ GeV will become available beginning in 2007/8. We explore, within the...

Strangeness Chemical Equilibration in QGP at RHIC and LHC (2006)

We study, in the dynamically evolving QGP fireball formed in relativistic heavy ion collisions at RHIC and LHC, the growth of strangeness yield toward and beyond the chemical equilibrium. We account...

Centrality dependence of strangeness and (anti)hyperon production at BNL RHIC (2006)

We study, in the dynamically evolving QGP fireball formed in relativistic heavy ion collisions at RHIC and LHC, the growth of strangeness yield toward and beyond the chemical equilibrium. We account...

Soft Hadron Ratios at the LHC (2006)

We evaluate strangeness produced in Au--Au interactions at $\sqrt{s_{\rm NN}}=200$ GeV, as function of reaction participant number $A$, and obtain the relative strange quark content at hadronization....

Strangeness and thresholds of phase changes in relativistic heavy ion collisions (2005)

High precision soft hadron abundance data produced in relativistic nuclear collisions at LHC at $\sqrt{s_{\rm NN}}\le 5500$ GeV will become available beginning in 2007/8. We explore, within the...

Soft Hadron Ratios at the LHC (2005)

We discuss how the dynamics of the evolving hot fireball of quark--gluon matter impacts phase transition between the deconfined and confined state of matter. The rapid expansion of the fireball of...

Centrality dependence of strangeness and (anti)hyperon production at BNL RHIC (2005)

High precision soft hadron abundance data produced in relativistic nuclear collisions at LHC at $\sqrt{s_{\rm NN}}\le 5500$ GeV will become available beginning in 2007/8. We explore, within the...

Strangeness and the discovery of quark-gluon plasma (2005)

We evaluate strangeness produced in Au--Au interactions at $\sqrt{s_{\rm NN}}=200$ GeV, as function of reaction participant number $A$, and obtain the relative strange quark content at hadronization....

Hadron Production and Phase Changes in Relativistic Heavy Ion Collisions (2005)

Strangeness flavor yield s and the entropy yield S are the observables of the deconfined quark-gluon state of matter which can be studied in the entire available experimental energy range at AGS,...

Centrality Dependence of Bulk Fireball Properties at RHIC (2005)

We study soft hadron production in relativistic heavy ion collisions in a wide range of reaction energy, 4.8 GeV

Rafelski, Johann, Letessier, Jean, Torrieri, Giorgio

We explore the centrality dependence of properties of the dense hadronic matter created in \sqrt{s_{NN}}=200 GeV Au--Au collisions at RHIC. Using the statistical hadronization model we fit particle...

SHARE: Statistical Hadronization with Resonances (2005)

Torrieri, Giorgio, Steinke, Steve, Broniowski, Wojciech, Florkowski, Wojciech, Letessier, Jean, Rafelski, Johann

SHARE is a collection of programs designed for the statistical analysis of particle production in relativistic heavy-ion collisions. With the physical input of intensive statistical parameters, it...

Strangeness and thresholds of phase changes in relativistic heavy ion collisions (2005)

Strangeness and thresholds of phase changes in relativistic heavy ion collisions (2005)

We discuss how the dynamics of the evolving hot fireball of quark--gluon matter impacts phase transition between the deconfined and confined state of matter. The rapid expansion of the fireball of...

Centrality Dependence of Bulk Fireball Properties at RHIC (2005)

We discuss how the dynamics of the evolving hot fireball of quark--gluon matter impacts phase transition between the deconfined and confined state of matter. The rapid expansion of the fireball of...

Rafelski, Johann, Letessier, Jean, Torrieri, Giorgio

We explore the centrality dependence of properties of the dense hadronic matter created in \sqrt{s_{NN}}=200 GeV Au--Au collisions at RHIC. Using the statistical hadronization model we fit particle...

SHARE: Statistical Hadronization with Resonances (2005)

Torrieri, Giorgio, Steinke, Steve, Broniowski, Wojciech, Florkowski, Wojciech, Letessier, Jean, Rafelski, Johann

SHARE is a collection of programs designed for the statistical analysis of particle production in relativistic heavy-ion collisions. With the physical input of intensive statistical parameters, it...

Centrality Dependence of Bulk Fireball Properties at RHIC (2004)

Rafelski, Johann, Letessier, Jean, Torrieri, Giorgio

We explore the centrality dependence of properties of the dense hadronic matter created in \sqrt{s_{NN}}=200 GeV Au--Au collisions at RHIC. Using the statistical hadronization model we fit particle...

Deconfinement energy threshold: analysis of hadron yields at 11.6 A GeV (2004)

Letessier, Jean, Rafelski, Johann, Torrieri, Giorgio

We analyze the hadron yields obtained at the AGS in the range 11--11.6 A GeV and discuss strategies to identify possible deconfinement at this energy scale. These include consideration of chemical...

Statistical hadronization with resonances (2004)

Torrieri, Giorgio, Letessier, Jean, Rafelski, Johann, Steinke, Steve

We introduce the equilibrium and non-equilibrium statistical hadronization picture of particle production in ultra-relativistic heavy ion collisions. We describe the related physical reaction...

SHARE: Statistical Hadronization with Resonances (2004)

Torrieri, Giorgio, Steinke, Steve, Broniowski, Wojciech, Florkowski, Wojciech, Letessier, Jean, Rafelski, Johann

SHARE is a collection of programs designed for the statistical analysis of particle production in relativistic heavy-ion collisions. With the physical input of intensive statistical parameters, it...

Statistical hadronization with resonances (2004)

Torrieri, Giorgio, Letessier, Jean, Rafelski, Johann, Steinke, Steve

We introduce the equilibrium and non-equilibrium statistical hadronization picture of particle production in ultra-relativistic heavy ion collisions. We describe the related physical reaction...

Strangeness Excitation Function in Heavy Ion Collisions (2004)

Statistical hadronization with resonances (2004)

We study as function of energy strangeness created in relativistic heavy ion collisions. We consider statistical hadronization with chemical freeze-out in both equilibrium and nonequilibrium. We...

Torrieri, Giorgio, Letessier, Jean, Rafelski, Johann, Steinke, Steve

We introduce the equilibrium and non-equilibrium statistical hadronization picture of particle production in ultra-relativistic heavy ion collisions. We describe the related physical reaction...

Strangeness Excitation Function in Heavy Ion Collisions (2004)

Strangeness and Statistical Hadronization: How to Study Quark-Gluon Plasma (2003)

We study as function of energy strangeness created in relativistic heavy ion collisions. We consider statistical hadronization with chemical freeze-out in both equilibrium and nonequilibrium. We...

Strangeness Excitation Function in Heavy Ion Collisions (2003)

Statistical hadronization is presented as mechanism for (strange) particle production from a deconfined quark--gluon plasma (QGP) fireball. We first consider hadronic resonance production at RHIC as...

Strangeness and Statistical Hadronization: How to Study Quark-Gluon Plasma (2003)

We study as function of energy strangeness created in relativistic heavy ion collisions. We consider statistical hadronization with chemical freeze-out in both equilibrium and nonequilibrium. We...

Strangeness and Statistical Hadronization: How to Study Quark-Gluon Plasma (2003)

Statistical hadronization is presented as mechanism for (strange) particle production from a deconfined quark--gluon plasma (QGP) fireball. We first consider hadronic resonance production at RHIC as...

Strange Particles from Dense Hadronic Matter (2002)

Statistical hadronization is presented as mechanism for (strange) particle production from a deconfined quark--gluon plasma (QGP) fireball. We first consider hadronic resonance production at RHIC as...

Rafelski, Johann, Letessier, Jean, Tounsi, Ahmed

After a brief survey of the remarkable accomplishments of the current heavy ion collision experiments up to 200A GeV, we address in depth the role of strange particle production in the search for new...

Non-equilibrium Hadrochemistry in QGP Hadronization (2002)

Importance of reaction volume in hadronic collisions: Canonical enhancement (2001)

This survey offers an introductory tutorial for students of any age of the currently thriving field of hadrochemistry. We discuss the different chemical potentials, how the hadronic phase space is...

Strangeness and Statistical QCD (2001)

We study the canonical flavor enhancement arising from exact conservation of strangeness, and charm flavor. Both the theoretical motivation, and the practical consequences are explored. We argue...

Probing Dense Matter with Strange Hadrons (2001)

We discuss properties of statistical QCD relevant in Fermi phase space model analysis of strange hadron production experimental data. We argue that the analysis results interpreted using established...

Rapidity particle spectra in sudden hadronization of QGP (2001)

Analysis of hadron production experimental data allows to understand the properties of the dense matter fireball produced in relativistic heavy ion collisions. We interpret the analysis results and...

Strangeness and QGP freeze-out dynamics (2001)

We show that the remaining internal longitudinal flow of colliding quarks in nuclei offers a natural explanation for the diversity of rapidity spectral shapes observed in Pb--Pb 158AGeV nuclear...

Rafelski, Johann, Torrieri, Giorgio, Letessier, Jean

We compare chemical and thermal analysis of the SPS Pb--Pb results at $158A$ GeV, and present a first chemical analysis of RHIC results. We show how a combined analysis of several strange hadron...

Strange hadrons and their resonances: a diagnostic tool of QGP freeze-out dynamics (2001)

Rafelski, Johann, Letessier, Jean, Torrieri, Giorgio

We update our chemical analysis of (strange) hadrons produced at the SPS in Pb--Pb collisions at 158A GeV and and present a first chemical analysis of RHIC results. We report that the shape of...

The Strange Quark-Gluon Plasma (2001)

Rafelski, Johann, Torrieri, Giorgio, Letessier, Jean

Strangeness flavor has turned out to be a very effective diagnostic tool of relativistic heavy ion physics. The absolute yield provides information about conditions arising in first instants of the...

Sudden Hadronization in Relativistic Nuclear Collisions (2000)

Quark-Gluon Plasma Fireball (2000)

We formulate and study a mechanical instability criterion for sudden hadronization of dense matter fireballs formed in 158A GeV Pb--Pb collisions. Considering properties of quark-gluon matter and...

Hamieh, Salah, Letessier, Jean, Rafelski, Johann

Lattice-QCD results provide an opportunity to model, and extrapolate to finite baryon density, the properties of the quark-gluon plasma (QGP). Upon fixing the scale of the thermal coupling constant...

Free Energy of a Hot Quark-Gluon Plasma (2000)

Hamieh, Salah, Letessier, Jean, Rafelski, Johann, Schroedter, Martin, Tounsi, Ahmed

Thermal (Th-)QCD properties appear to disagree with lattice (L-)QCD results, which suggests that Th-QCD does not have a valid perturbative expansion. However, we reproduce L-QCD using the first order...

Observing Quark-Gluon Plasma with Strange Hadrons (2000)

Low-m_t charged pion asymmetry enhancement from hadronization of QGP (1999)

We review the methods and results obtained in an analysis of the experimental heavy ion collision research program at nuclear beam energy of 160-200A GeV. We study strange, and more generally,...

Letessier, Jean, Tounsi, Ahmed, Rafelski, Johann

We show that in sudden hadronization of QGP a non-equilibrium value of the pion phase space occupancy parameter gamma_q>1 is expected in order to accommodate the entropy excess in QGP and the process...

Diagnosis of QGP with Strange Hadrons (1999)

Expected Production of Strange Baryons and Antibaryons in Baryon-Poor QGP (1999)

We review the current status of strangeness as signature of the formation and dissociation of the deconfined QGP at the SPS energy scale, and present the status of our considerations for RHIC...

Hadron production in Pb-Pb collisions at 158A GeV (1999)

In a dynamical model of QGP at RHIC we obtain the temporal evolution of strange phase space occupancy at conditions expected to occur in 100+100A GeV nuclear collisions. We show that the sudden QGP...

Hadron Freeze-out and QGP Hadronization (1999)

A Fermi statistical model analysis of hadron abundances and spectra obtained in several relativistic heavy ion collision experiments is utilized to characterize a particle source. Properties...

Chemical Nonequilibrium in High Energy Nuclear Collisions (1998)

Abundances and $m_\bot$-spectra of strange and other hadronic particles emanating from central 158-200 A GeV reactions between nuclei are found to originate from a thermally equilibrated, deconfined...

Quark-Gluon Plasma in Pb--Pb 158 A GeV collisions: Evidence from strange particle abundances and the Coulomb effect (1998)

Strange particles produced in S-Au/W/Pb 200 A GeV and Pb-Pb 158 A GeV reactions are described invoking final hadronic phase space in thermal equilibrium, but allowing chemical non-equilibrium....

Chemical non-equilibrium and deconfinement in 200 A GeV Sulphur induced reactions (1998)

The hadronic particle production data from relativistic nuclear Pb--Pb 158 A GeV collisions are successfully described within the chemical non-equilibrium model, provided that the analysis treats...

Strange Particle Abundance in QGP Formed in 200 GeV A Nuclear Collisions (1997)

We interpret hadronic particle abundances produced in S--Au/W/Pb 200 A GeV reactions in terms of the final state hadronic phase space model and determine by a data fit of the chemical hadron...

Hot hadronic matter and strange anti-baryons (1997)

We investigate here the relative abundance of strange particles produced in nuclear collisions at the SPS energies (9 GeV A in CM frame) assuming that the central reaction fireball consists of...

Strange Particle Freeze-Out (1997)

We demonstrate that both quark-gluon plasma (QGP) and hadronic gas (HG) models of the central fireball created in S -> W collisions at 200 GeV A are possible sources of the recently observed strange...

Gluon production, cooling and entropy in nuclear collisions (1997)

We reconsider thermal conditions of the central fireball presumed to be the source of abundantly produced strange (anti-)baryons in S -> W collisions at 200 GeV A. We show that it is possible to...

Strange anti-baryons - QGP versus HG (1997)

We study the cooling (heating) of a glue-parton gas due to production (destruction) of particles and determine the associated production of entropy. We incorporate sharing of the system energy among...

Rafelski, Johann, Letessier, Jean, Tounsi, Ahmed

We study quark-gluon plasma (QGP) and hadronic gas (HG) models of the central fireball presumed to be the source of abundantly produced strange (anti-)baryons in S -> W collisions at 200 GeV A. We...

Strangeness and Particle Freeze-out in Nuclear Collisions at 14.6 Gev a (1997)

Strange Antibaryons from QGP (1997)

We study the chemical conditions at freeze-out associated with the production of strange-particles in Si-Au collisions at 14.6 GeV A. We obtain freeze-out chemical potentials and temperature, and...

Formation and Evolution of the Quark-Gluon Plasma (1997)

We study as function of the collision energy and stopping the thermal conditions reached in a quark-gluon plasma fireball formed in a relativistic heavy ion collision. We explore strange particle...

Hadronic Signatures of Deconfinement in relativistic nuclear collisions (1997)

Imposing an equilibrium between the thermal pressure of deconfined quarks and gluons and the dynamical compression pressure exercised by in-flowing nuclear matter, we study the initial thermal...

Rafelski, Jan, Letessier, Jean, Tounsi, Ahmed

We describe the remarkable accomplishments of the current heavy ion Pb--Pb collision experiments involving strange particle production, carried out at 158A GeV at CERN--SPS. These experimental...

Strangeness in Pb-Pb Collisions at 158 A GeV (1997)

Fourth order difference equation for the associated Meixner and Charlier polynomials (1996)

We study relative strange particle abundances measured in Pb-Pb 158 A GeV interactions. The thermal and chemical source parameters of these particles are determined under reaction scenario hypothesis...

Jean Letessier, Galliano Valent

An explicit representation of the associated Meixner polynomials (with a real association parameter fl 0) is given in terms of hypergeometric functions. This representation allows to derive the...

NATO Advanced Workshop on Hot Hadronic Matter : Theory and Experiment (1995)

Gutbrod, Hans H, Letessier, Jean, Rafelski, Johann

Energy Dependence of Strange Particle Yields from a QGP-Fireball (1995)