The use of statistical mechanics to describe hadron production in high energy collisions

2007 ◽  
pp. 71-88
Author(s):  
Francesco Becattini
Keyword(s):  
Statistical Mechanics ◽  
High Energy ◽  
Hadron Production ◽  
High Energy Collisions

scholarly journals Causality constraints on hadron production in high energy collisions

2014 ◽  
Vol 23 (04) ◽  
pp. 1450019 ◽  
Author(s):  
Paolo Castorina ◽  
Helmut Satz
Keyword(s):  
Baryon Number ◽  
Heavy Ion ◽  
High Energy ◽  
Hadron Production ◽  
Space Time ◽  
Horizon Problem ◽  
Ion Interactions ◽  
Quantum Numbers ◽  
High Energy Collisions ◽  
Finite Space

For hadron production in high energy collisions, causality requirements lead to the counterpart of the cosmological horizon problem: the production occurs in a number of causally disconnected regions of finite space-time size. As a result, globally conserved quantum numbers (charge, strangeness, baryon number) must be conserved locally in spatially restricted correlation clusters. This provides a theoretical basis for the observed suppression of strangeness production in elementary interactions (pp, e+e-). In contrast, the space-time superposition of many collisions in heavy ion interactions largely removes these causality constraints, resulting in an ideal hadronic resonance gas in full equilibrium.

scholarly journals Characteristics of Strange Hadron Production in Some High Energy Collisions and the Role of Power Laws

2012 ◽  
Vol 02 (01) ◽  
pp. 1-11 ◽  
Author(s):  
Sunil Kumar Biswas ◽  
Goutam Sau ◽  
Amar Chandra Das Ghosh ◽  
Subrata Bhattacharyya
Keyword(s):  
Power Laws ◽  
High Energy ◽  
Hadron Production ◽  
Strange Hadron ◽  
High Energy Collisions

scholarly journals Hadron freeze-out and Unruh radiation

2015 ◽  
Vol 24 (07) ◽  
pp. 1550056 ◽  
Author(s):  
Paolo Castorina ◽  
Alfredo Iorio ◽  
Helmut Satz
Keyword(s):  
Chemical Potential ◽  
Average Energy ◽  
String Tension ◽  
High Energy ◽  
Hadron Production ◽  
Entropy Density ◽  
Baryon Chemical Potential ◽  
High Energy Collisions ◽  
Production Pattern ◽  
Freeze Out

In this paper, we consider hadron production in high energy collisions as an Unruh radiation phenomenon. This mechanism describes the production pattern of newly formed hadrons and is directly applicable at vanishing baryon chemical potential, μ ≃ 0. It had already been found to correctly yield the hadronization temperature, [Formula: see text] in terms of the string tension σ. Here, we show that the Unruh mechanism also predicts hadronic freeze-out conditions, giving [Formula: see text] in terms of the entropy density s and [Formula: see text] for the average energy per hadron. These predictions provide a theoretical basis for previous phenomenological results and are also in accord with recent lattice studies.

scholarly journals PARTICLE MULTIPLICITIES AND THERMALIZATION IN HIGH ENERGY COLLISIONS

2003 ◽  
Vol 12 (05) ◽  
pp. 649-659 ◽  
Author(s):  
JAMES HORMUZDIAR ◽  
STEPHEN D. H. HSU ◽  
GREGORY MAHLON
Keyword(s):  
Free Particle ◽  
Heavy Ion ◽  
High Energy ◽  
Hadron Production ◽  
Apparent Temperature ◽  
Tree Level ◽  
Usual Sense ◽  
Qcd Phase Transition ◽  
Ion Collisions ◽  
High Energy Collisions

We investigate the conditions under which particle multiplicities in high energy collisions are Boltzmann distributed, as is the case for hadron production in e+e-, pp, [Formula: see text] and heavy ion collisions. We show that the apparent temperature governing this distribution does not necessarily imply equilibrium (thermal or chemical) in the usual sense. We discuss an explicit example using tree level amplitudes for N photon production in which a Boltzmann-like distribution is obtained without any equilibration. We argue that the failure of statistical techniques based on free particle ensembles may provide a signal for collective phenomena (such as large shifts in masses and widths of resonances) related to the QCD phase transition.

scholarly journals Strangeness Suppression and Color Deconfinement

2018 ◽  
Vol 171 ◽  
pp. 02005
Author(s):  
Helmut Satz
Keyword(s):  
Initial Temperature ◽  
Strange Particle ◽  
High Energy ◽  
Universal Function ◽  
Ideal Gas ◽  
Entropy Density ◽  
Suppression Factor ◽  
Thermal Medium ◽  
High Energy Collisions ◽  
Hadronic Resonances

The relative multiplicities for hadron production in different high energy collisions are in general well described by an ideal gas of all hadronic resonances, except that under certain conditions, strange particle rates are systematically reduced. We show that the suppression factor γs, accounting for reduced strange particle rates in pp, pA and AA collisions at different collision energies, becomes a universal function when expressed in terms of the initial entropy density s0 or the initial temperature T of the produced thermal medium. It is found that γs increases from about 0.5 to 1.0 in a narrow temperature range around the quark-hadron transition temperature Tc ≃ 160 MeV. Strangeness suppression thus disappears with the onset of color deconfinement; subsequently, full equilibrium resonance gas behavior is attained.

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