Bedanga Mohanty NISER For STAR Collaboration Based on STAR arXiv 170107065 0120 Goals of HeavyIon Collision Find out the phase structure of QCD phase d iagram e xperimentally ID: 1029235
Download Presentation The PPT/PDF document "Particle Production in Heavy Ion Collisi..." is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1. Particle Production in Heavy Ion Collisions at RHICBedanga MohantyNISER(For STAR Collaboration)Based on STAR: arXiv: 1701.07065 01/20
2. Goals of Heavy-Ion CollisionFind out the phase structure of QCD phase diagram experimentallyIn this talk we will focus on the freeze-out dynamics in heavy-ion collisions02/20
3. STAR Detector System TPCMTDMagnetBEMCBBCEEMCTOFHFT03/20STAR: arXiv: 1701.07065
4. Particle IdentificationCharged particles: , K, pIonization energy loss: - < dE/dx > ~ A / 2 = A (1 + m2/ p2) Time of flight: < > = L / = L (1 + m2/ p2) 1/2Momentum p = mm = [ p (1 - 04/20STAR: arXiv: 1701.07065
5. Invariant Yields05/20Based on STAR: arXiv: 1701.07065
6. Yields06/20STAR: arXiv: 1701.07065 and references therein Yields of hadrons per participating nucleon pair at mid rapidity in central heavy-ion collisions as a function of collision energy
7. Transverse Mass07/20STAR: arXiv: 1701.07065 and references therein Average transverse mass of hadrons at mid rapidity in central heavy-ion collisions as a function of collision energy
8. Particle Ratios08/20STAR: arXiv: 1701.07065 Anti-particle to particle ratio at mid rapidity in central heavy-ion collisions as a function of collision energy
9. Particle Ratios09/20STAR: arXiv: 1701.07065 and reference therein Energy dependence of Kaon to pion ratio at mid-rapidity in central heavy-ion collisions
10. Freeze-out DynamicsChemical Freeze-outKinetic Freeze-out Tests of thermal statistical models10/20
11. Chemical Freeze-out DynamicsDefinition:Inelastic collisions ceasesChemical composition or Particle ratios get fixedStatistical Thermal ModelParticle Abundances: Grand Canonical EnsembleDynamics Characterized by:Temperature Tch and baryon chemical potential mBModel Features: Assumes non-interacting hadrons and resonancesAssumes thermodynamically equilibrium systemEnsembles : Grand Canonical - average conservation of B, S, and Q Strangeness Canonical - exact conservation of S Canonical - exact conservation of B, S, and Q11/20
12. Chemical Freeze-out:Data vs. ModelSTAR: arXiv: 1701.07065 12/20
13. Chemical Freeze-out: T vs. mBSTAR: arXiv: 1701.07065 13/20
14. Kinetic Freeze-out DynamicsDefinition: Elastic collisions ceasesMomentum distribution of particles get fixedBlast Wave ModelrandomboostedSource is assumed to be:Locally thermally equilibratedBoosted in radial directionDynamics Characterized by:Thermal temperature Tfo and velocity parameter T14/20
15. Kinetic Freeze-out: BW ModelSTAR: arXiv: 1701.07065 15/20
16. Kinetic Freeze-out: ParametersAnti-correlations: Tfo vs. TMore collectivity in central collisions vs. peripheral collisionsLower temperature at higher energies and central collisionsSTAR: arXiv: 1701.07065 ALICE:Phys.Rev. C88 (2013) 04491016/20
17. Summary : Freeze-out DynamicsCollectivity increases with beam energy for central collisionsChemical Freeze-out temperature increases and then saturates with beam energyKinetic Freeze-out temperature decreases with beam energy for central collisionsGap between chemical and kinetic freeze-out temperatures increases with beam energySuggests system interacts for longer duration in higher energy collisions17/20STAR: arXiv: 1701.07065
18. RHIC-BES Phase-II Detector UpgradesBetter acceptance for the STAR TPC in rapidity and pT (low momentum and |h| < 1.5)Centrality determination and Event Plane determination: EPD - 2 < |h| < 4Trigger performance ~ factor of 10 improvement expectedSN0598 : Studying the Phase Diagram of QCD Matter at RHIC : https://drupal.star.bnl.gov/STAR/files/BES_WPII_ver6.9_Cover.pdf 18/20
19. RHIC-BES Phase-II19/20
20. RHIC – Fixed Target ProgramD. Cebra: INT Program INT-16-3: Exploring the QCD Phase Diagram through Energy Scans 20/20