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Collective Flow Signals the Quark-Gluon Plasma

Collective Flow Signals the Quark-Gluon Plasma A critical discussion of the present status of the CERN experiments on hadron collective flow is given. We emphasize the importance of the flow excitation function from 1 to 50 <i>A</i>·GeV: here the hydrodynamic model has predicted the collapse of the <InlineEquation ID=IE"1"><EquationSource Format="TEX"><![CDATA[<InlineEquation ID=IE"2"><EquationSource Format="TEX"><![CDATA[$]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>v_1$ flow and of the <i>v</i>2 flow at ∼10 <i>A</i>·GeV; at 40 <i>A</i>·GeV it has been recently observed by the NA49 Collaboration. Since hadronic rescattering models predict much larger flow than observed at this energy we interpret this observation as potential evidence for a first order phase transition at high baryon density &rho;<i>B</i>. A detailed discussion of the collective flow as a barometer for the equation of state (EoS) of hot dense matter at RHIC follows. Here, hadronic rescattering models can explain <30% of the observed elliptic flow, <i>v</i>2, for <i>pT</i> > 2 GeV/c. This is interpreted as evidence for the production of superdense matter at RHIC with initial pressure far above hadronic pressure, <i>p</i> > 1 GeV/fm3. We suggest that the fluctuations in the flow, <i>v</i>1 and <i>v</i>2, should be measured in future since ideal hydrodynamics predicts that they are larger than 50% due to initial state fluctuations. Furthermore, the QGP coefficient of viscosity may be determined experimentally from the fluctuations observed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Physica Hungarica Series A, Heavy Ion Physics Springer Journals

Collective Flow Signals the Quark-Gluon Plasma

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References (3)

Publisher
Springer Journals
Copyright
Copyright © 2005 by Akadémiai Kiadó
Subject
Physics; Nuclear Physics, Heavy Ions, Hadrons
ISSN
1219-7580
eISSN
1588-2675
DOI
10.1556/APH.24.2005.1-4.26
Publisher site
See Article on Publisher Site

Abstract

A critical discussion of the present status of the CERN experiments on hadron collective flow is given. We emphasize the importance of the flow excitation function from 1 to 50 <i>A</i>·GeV: here the hydrodynamic model has predicted the collapse of the <InlineEquation ID=IE"1"><EquationSource Format="TEX"><![CDATA[<InlineEquation ID=IE"2"><EquationSource Format="TEX"><![CDATA[$]]></EquationSource></InlineEquation>]]></EquationSource></InlineEquation>v_1$ flow and of the <i>v</i>2 flow at ∼10 <i>A</i>·GeV; at 40 <i>A</i>·GeV it has been recently observed by the NA49 Collaboration. Since hadronic rescattering models predict much larger flow than observed at this energy we interpret this observation as potential evidence for a first order phase transition at high baryon density &rho;<i>B</i>. A detailed discussion of the collective flow as a barometer for the equation of state (EoS) of hot dense matter at RHIC follows. Here, hadronic rescattering models can explain <30% of the observed elliptic flow, <i>v</i>2, for <i>pT</i> > 2 GeV/c. This is interpreted as evidence for the production of superdense matter at RHIC with initial pressure far above hadronic pressure, <i>p</i> > 1 GeV/fm3. We suggest that the fluctuations in the flow, <i>v</i>1 and <i>v</i>2, should be measured in future since ideal hydrodynamics predicts that they are larger than 50% due to initial state fluctuations. Furthermore, the QGP coefficient of viscosity may be determined experimentally from the fluctuations observed.

Journal

Acta Physica Hungarica Series A, Heavy Ion Physics – Springer Journals

Published: Mar 3, 2014

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