the effect of dynamical parton recombination on event-by-event observables
DESCRIPTION
The Effect of Dynamical Parton Recombination on Event-by-Event Observables. Marcus Bleicher & Stephane Haussler Institut für Theoretische Physik Goethe Universität Frankfurt Germany. Thanks. Katharina Schmidt Hannah Petersen Stephane Haussler Daniel Krieg Benjamin Lungwitz. - PowerPoint PPT PresentationTRANSCRIPT
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Marcus Bleicher, ISMD Berkeley 08/2007
The Effect of Dynamical Parton Recombination on Event-by-Event Observables
The Effect of Dynamical Parton Recombination on Event-by-Event Observables
Marcus Bleicher & Stephane Haussler
Institut für Theoretische Physik
Goethe Universität Frankfurt
Germany
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Marcus Bleicher, ISMD Berkeley 08/2007
ThanksThanks
• Elena Bratkovskaya
• Manuel Reiter
• Sascha Vogel
• Xianglei Zhu
• Horst Stoecker
•Timo Spielmann
• Katharina Schmidt
• Hannah Petersen
• Stephane Haussler
• Daniel Krieg
• Benjamin Lungwitz
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Marcus Bleicher, ISMD Berkeley 08/2007
Outline of the talkOutline of the talk
• Introduction
• The Quark-Molecular Dynamics
• Charge fluctuations
• Baryon-strangeness correlations
• Charge transfer fluctuations (see backup)
• Summary
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Marcus Bleicher, ISMD Berkeley 08/2007
MotivationMotivation
At RHIC: look for signals of freely moving partons.(D, CBS,)
At FAIR/SPS:look for the mixed phase and the onset of deconfinement(kp
E. Bratkovskaya, M.B. et al., PRC 2005
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Marcus Bleicher, ISMD Berkeley 08/2007
Fluctuations are THE tool!?Fluctuations are THE tool!?
• Fluctuations might provide information on- deconfinement/confinement- correlation length- thermalization- nature of the QGP- critical point
• Is it that easy?- finite time and volume- non-equilibrium- hadronization
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Marcus Bleicher, ISMD Berkeley 08/2007
Scaled variancesScaled variances
• Non-trivial structuresDetailed non-equilibrium studies necessary
Lungwitz, Bleicher, in preparation
4pi forward
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Marcus Bleicher, ISMD Berkeley 08/2007
The tool: qMDThe tool: qMD
qMD : Quark Molecular Dynamics (a toy model for hadronization)
• out-of-equilibrium transport model, (Vlasov equation)
• provides a hadronization prescription
• essentially realizes a dynamical quark recombination approach
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Marcus Bleicher, ISMD Berkeley 08/2007
Quark Molecular DynamicsQuark Molecular Dynamics
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Marcus Bleicher, ISMD Berkeley 08/2007
TrajectoriesTrajectories
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Marcus Bleicher, ISMD Berkeley 08/2007
Hadronization procedureHadronization procedure
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Marcus Bleicher, ISMD Berkeley 08/2007
Some properties: equilibriumSome properties: equilibrium
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Marcus Bleicher, ISMD Berkeley 08/2007
• For ‘real’ physics use UrQMD initial state
• dissolve strings into ‘free’ quarks
• evolve system with qMD
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Marcus Bleicher, ISMD Berkeley 08/2007
Entropy considerationEntropy consideration
<N>
<m>
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Marcus Bleicher, ISMD Berkeley 08/2007
Entropy and recombinationEntropy and recombination
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Marcus Bleicher, ISMD Berkeley 08/2007
The idea behind conserved charge fluctuations
The idea behind conserved charge fluctuations
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Marcus Bleicher, ISMD Berkeley 08/2007
Fluctuations and suceptibilitiesFluctuations and suceptibilities
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Marcus Bleicher, ISMD Berkeley 08/2007
Comparison to lQCD (I)Comparison to lQCD (I)
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Marcus Bleicher, ISMD Berkeley 08/2007
Comparison to lQCD (II)Comparison to lQCD (II)
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Marcus Bleicher, ISMD Berkeley 08/2007
• Hadron gas seems to be pretty similar to QGP…
( A. Majumder et al, Phys. Rev.C 74 (2006) 054901 )
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Marcus Bleicher, ISMD Berkeley 08/2007
Charge ratio fluctuationsCharge ratio fluctuations
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Marcus Bleicher, ISMD Berkeley 08/2007
Pion gas, D ~ 4
Quark gas, D ~ 1
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Marcus Bleicher, ISMD Berkeley 08/2007
Can one observe the fluctuations in the initial state?
Can one observe the fluctuations in the initial state?
See e.g. Shuryak et al, Phys.Rev.C63:064903,2001
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Marcus Bleicher, ISMD Berkeley 08/2007
Experimental resultsExperimental results
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Marcus Bleicher, ISMD Berkeley 08/2007
Recombination and fluctuationRecombination and fluctuation
part
on f
ract
ion
y=1
Au+Au@200 AGeV
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Marcus Bleicher, ISMD Berkeley 08/2007
See also…See also…
• Bialas: Recombination blur ratio fluctuations (Phys.Lett.B532:249-251,2002)
• Nonaka: Recombination blurs ratio fluctuations (Phys.Rev.C71:051901,2005 )
• Ma: Hadronization blurs ratio fluctuations(SQM 2007)
• Present work:
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Marcus Bleicher, ISMD Berkeley 08/2007
Baryon-Strangeness CorrelationsBaryon-Strangeness Correlations
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Marcus Bleicher, ISMD Berkeley 08/2007
Time evolutionTime evolution
y=1
Au+Au@200 AGeV
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Marcus Bleicher, ISMD Berkeley 08/2007
ConclusionsConclusions
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Marcus Bleicher, ISMD Berkeley 08/2007
Additional slidesAdditional slides
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Marcus Bleicher, ISMD Berkeley 08/2007
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Marcus Bleicher, ISMD Berkeley 08/2007
Charge transfer fluctuationsCharge transfer fluctuations
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Marcus Bleicher, ISMD Berkeley 08/2007
qMD results on kappaqMD results on kappa
Au+Au@200 AGeV