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 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 Role of quarks in hadroproduction in high energy collisions

2014 ◽  
Vol 888 ◽  
pp. 65-74 ◽  
Author(s):  
A.A. Bylinkin ◽  
A.A. Rostovtsev
Keyword(s):  
High Energy ◽  
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.

Fundamentality

2017 ◽  
Author(s):  
Richard Healey
Keyword(s):  
Quantum Theory ◽  
High Energy Physics ◽  
Physical Property ◽  
Natural World ◽  
High Energy ◽  
Quantum Field Theories ◽  
Fundamental Physics ◽  
The World ◽  
Energy Physics

The metaphor that fundamental physics is concerned to say what the natural world is like at the deepest level may be cashed out in terms of entities, properties, or laws. The role of quantum field theories in the Standard Model of high-energy physics suggests that fundamental entities, properties, and laws are to be sought in these theories. But the contextual ontology proposed in Chapter 12 would support no unified compositional structure for the world; a quantum state assignment specifies no physical property distribution sufficient even to determine all physical facts; and quantum theory posits no fundamental laws of time evolution, whether deterministic or stochastic. Quantum theory has made a revolutionary contribution to fundamental physics because its principles have permitted tremendous unification of science through the successful application of models constructed in conformity to them: but these models do not say what the world is like at the deepest level.

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