Javier Castillo QM2004 - Oakland - 15/01/2004 1 Elliptic flow of multi-strange baryons and in Au + Au collisions at GeV 200 NN s Javier Castillo Lawrence Berkeley National Laboratory for The STAR Collaboration • Introduction • Results from radial transverse flow • and v 2 analysis • Results and Discussion
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Elliptic flow of multi-strange baryons and in Au + Au collisions at GeV
Elliptic flow of multi-strange baryons and in Au + Au collisions at GeV. Javier Castillo Lawrence Berkeley National Laboratory for The STAR Collaboration. Introduction Results from radial transverse flow. and v 2 analysis Results and Discussion. Time. - PowerPoint PPT Presentation
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Javier CastilloQM2004 - Oakland - 15/01/2004 1
Elliptic flow of multi-strange baryons and
in Au + Au collisions at GeV
200 NN
s
Javier CastilloLawrence Berkeley National Laboratory
forThe STAR Collaboration
• Introduction• Results from radial transverse flow
• and v2 analysis• Results and Discussion
Javier CastilloQM2004 - Oakland - 15/01/2004 2
Introduction
PCM & clust. hadronization
NFD
NFD & hadronic TM
PCM & hadronic TM
CYM & LGT
string & hadronic TM
1) Initial Condition - baryon transfer - ET production - partons dof
Approach: • Probes “insensitive” to hadronic stage (,,,D,J/)
Javier CastilloQM2004 - Oakland - 15/01/2004 3
Radial transverse flow
• , K, p : <p> increases with collision centrality
• , K, p : <p> centrality dependence is stronger for heavier particles→ Consistent with collective flow picture.
• , K, p : <p> increases with particle mass as described by thermal models
• , : <p> deviates from common thermal freeze-out picture!
• Early thermal freeze-out ?• Early collectivity ?
• , : <p> shows no dependence with Npart
→ Different flow behavior!
Javier CastilloQM2004 - Oakland - 15/01/2004 4
BlastWave fitsSource is assumed to be:
• In local thermal equilibrium• Strongly boosted
• , K, p: Common thermal freeze-out at T~90 MeV and <>~0.60 c
• : Shows different thermal freeze-out behavior:
• Higher temperature• Lower transverse flow
Probe earlier stage of the collision, one at which transverse flow has already developed If created at an early partonic stage it must show significant elliptic flow (v2)
Au+Au sNN=200 GeV
STAR Preliminary
68.3% CL 95.5% CL 99.7% CL
Javier CastilloQM2004 - Oakland - 15/01/2004 5
Hydrodynamic calculation
Hydrodynamic calculation with an E.O.S. containing a partonic and a hadronic phase:• P.F.Kolb and R.Rapp, Phys. Rev. C 67 (2003) 044903• P.F.Kolb, J.Sollfrank, and U.Heinz, Phys. Rev. C 62 (2000) 054909