JET Collaboration Meeting June 17-18, 2014, UC-Davis1/25 Flow and “Temperature” of the Parton Phase from AMPT Zi-Wei Lin Department of Physics East Carolina.

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JET Collaboration Meeting June 17-18, 2014, UC-Davis1/25 Flow and “Temperature” of the Parton Phase from AMPT Zi-Wei Lin Department of Physics East Carolina University Based on arXiv: (to appear on Phys Rev C); Only addresses partons within space-time rapidity | η |<1/2

JET Collaboration Meeting June 17-18, 2014, UC-Davis2/25 Outline Motivation Constraining parameters of the AMPT-String Melting model Evolution of flow, densities and energy-momentum Evolution of extracted effective temperatures Over-population of partons Summary

JET Collaboration Meeting June 17-18, 2014, UC-Davis3/25 Motivation Use thermodynamic variables to describe the bulk parton matter (usually in non-equilibrium) modeled by transport This provides a link between transport model and Hydrodynamics Other studies that use thermodynamic variables (T, ε,...) to model the physics In particular, evolution of thermodynamic variables of the bulk parton matter provides another soft background for jet quenching and energy loss studies. Evolution data posted at ; also linked at the JET Collaboration wiki page

JET Collaboration Meeting June 17-18, 2014, UC-Davis4/25 The same central 200AGeV Au+Au event (at t=5 fm/c) from AMPT-Default vs AMPT-String Melting (SM) AMPT-SM: early parton stage dominates; hadron stage starts later. describes v2 & HBT Not dN/dy or p T -spectra Constraining parameters of the AMPT-SM model AMPT-Default: describes dN/dy & p T -spectra Not v2 or HBT Beams from the left & right sides

JET Collaboration Meeting June 17-18, 2014, UC-Davis5/25 Constraining parameters of the AMPT-SM model HIJING1.0AMPT-SM [1]AMPT-SM in [2]AMPT-SM in this Study Lund string a for RHIC, 0.30 for LHC Lund string b (GeV -2 ) α s in parton cascade N/A Parton cross sectionN/A~ 6 mb1.5 mb3 mb Model describes pp, …v2 & HBT not dN/dy or p T dN/dy & v2 (LHC) not p T dN/dy, p T & v2 (RHIC & LHC) Goal: fit low-pt (<2GeV/c) π & K data on dN/dy, p T –spectra & v2 in central (0-5%) and mid-central (20-30%) 200AGeV Au+Au collisions (RHIC) and 2760AGeV Pb+Pb collisions (LHC) [1] Lin, Ko, Li, Zhang and Pal, Phys Rev C 72, (2005); etc. [2] Xu and Ko, Phys Rev C 83, (2011).

JET Collaboration Meeting June 17-18, 2014, UC-Davis6/25 Constraining parameters of the AMPT-SM model dN/dy of π & K:

JET Collaboration Meeting June 17-18, 2014, UC-Davis7/25 Constraining parameters of the AMPT-SM model p T -spectra of π & K (in central collisions):

JET Collaboration Meeting June 17-18, 2014, UC-Davis8/25 Constraining parameters of the AMPT-SM model v2 of π & K (in mid-central collisions):

JET Collaboration Meeting June 17-18, 2014, UC-Davis9/25 Evolution of flow, densities and energy-momentum Transverse flow in RHIC central: the transverse plane at 1 fm resolution: This study averages over many events (for the same collision system at the same centrality); thus e-by-e fluctuations are neglected XX

JET Collaboration Meeting June 17-18, 2014, UC-Davis10/25 Evolution of flow, densities and energy-momentum β y ≈0 due to symmetry Flow ≈ β x : shape depends on location; decrease seen at late times; develops fast near edge of overlap volume Transverse flow in RHIC central: at 2 locations along x:

JET Collaboration Meeting June 17-18, 2014, UC-Davis11/25 Significant flow near the edge even at t=1fm/c Flow at early times: ~ Pre-equilibrium flow, modeled by elastic parton cascade here Evolution of flow, densities and energy-momentum shape at different times Transverse flow in RHIC central:

JET Collaboration Meeting June 17-18, 2014, UC-Davis12/25 Evolution of flow, densities and energy-momentum Example: the center cell in RHIC central All evaluated in the rest frame of each cell

JET Collaboration Meeting June 17-18, 2014, UC-Davis13/25  Extract effective temperatures using relations for a massless ideal QGP with the Boltzmann momentum distribution: Each variable gives a “temperature”: If their values are different for a cell  The local parton system in the cell is not in full equilibrium Evolution of extracted effective temperatures Difference between Boltzmann and quantum distributions is very small for these relations

JET Collaboration Meeting June 17-18, 2014, UC-Davis14/25  The effective temperatures are all different. Evolution of extracted effective temperatures in the dense phase For the center cell in RHIC-central:

JET Collaboration Meeting June 17-18, 2014, UC-Davis15/25 Evolution of extracted effective temperatures is true for the center cell of all 4 collision systems:

JET Collaboration Meeting June 17-18, 2014, UC-Davis16/25 Evolution of extracted effective temperatures How about other locations?  over the inner part of the overlap volume; the opposite over the outer part.

JET Collaboration Meeting June 17-18, 2014, UC-Davis17/25 Evolution of extracted effective temperatures This is the case in all 4 collision systems:

JET Collaboration Meeting June 17-18, 2014, UC-Davis18/25 Evolution of extracted effective temperatures in RHIC central over the transverse plane: Note again: for partons within | η |<1/2

JET Collaboration Meeting June 17-18, 2014, UC-Davis19/25 We have seen: for each cell in the inner part of the overlap volume  Energy and number densities ε, n are too high, relative to the expected values for an ideal QGP at (that has the same as partons in the cell)  The local parton system is over-populated. Quarks/antiquark densities are limited by the Pauli principle  Gluons must be over-populated. Over-population of partons Expect density for an ideal QGP at temperature For the center cell:

JET Collaboration Meeting June 17-18, 2014, UC-Davis20/25 Over-population of partons  QGP cells at t=0.2 fm/c  Over-populated cells at t=0.2 fm/c   Over-populated cells at t=3 fm/c Transverse plane of LHC mid-central (b=7.8fm) Terminology: QGP cell: cell with ε >1.05 GeV/fm 3 Over-populated cell: QGP cell with Over-population in inner part of overlap volume; many over-populated cells even after several fm/c

JET Collaboration Meeting June 17-18, 2014, UC-Davis21/25 Over-population of partons Transverse area: 50-70% of initial QGP cells are over-populated. After 2-3 fm/c, all QGP cells are over-p.

JET Collaboration Meeting June 17-18, 2014, UC-Davis22/25 Over-population of partons Evaluate parton phase-space density function f(p) in center cell of LHC central: compared with equilibrium functions fails in slope fails in magnitude

JET Collaboration Meeting June 17-18, 2014, UC-Davis23/25 Over-population of partons Compare f(p) in center cell of LHC central with non-equilibrium functions: Set T as, then match ε of the cell  an equation relating and f(p) can be described well by non-equilibrium functions, with are quark & gluon phase-space occupancy factors, respectively Pauli principle

JET Collaboration Meeting June 17-18, 2014, UC-Davis24/25 Over-population of partons Can also use gluon “chemical potential” to represent gluon over-population:

JET Collaboration Meeting June 17-18, 2014, UC-Davis25/25 Effective temperatures extracted from different variables (ε, n,,, … in the rest frame of each cell) can be quite different  parton matter from AMPT-SM are not in full equilibrium Summary over the inner part of the overlap volume  The parton system (at least the gluons) is over-populated there, often by a large factor. Parton phase-space distributions from the constrained AMPT-SM model cannot be described by QGP in full equilibrium (Boltzmann or quantum) can be described well by non-equilibrium QGP (with phase-space occupancy factors ) A large gluon over-population gives If this is true, how to incorporate such non-equilibrium distributions into hydro?