Azimuthallysensitive HBT in STAR - PowerPoint PPT Presentation

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Azimuthallysensitive HBT in STAR

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full blastwave. STAR data. Au Au 130 GeV minbias. significant oscillations observed ... consistent with blast-wave parameterization of v2(pT,m), spectra, R(pT), K-p ... – PowerPoint PPT presentation

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Title: Azimuthallysensitive HBT in STAR


1
Azimuthally-sensitive HBT in STAR
Mike Lisa Ohio State University
  • Motivation
  • Noncentral collision dynamics
  • Azimuthally-sensitive interferometry previous
    results
  • STAR results
  • Hydrodynamic predictions for RHIC and LHC
  • Summary

2
Central collision dynamics _at_ RHIC
  • Hydrodynamics reproduces p-space aspects of
    particle emission up to pT2GeV/c (99 of
    particles)? hopes of exploring the early, dense
    stage

Heinz Kolb, hep-th/0204061
3
Central collision dynamics _at_ RHIC
  • Hydrodynamics reproduces p-space aspects of
    particle emission up to pT2GeV/c (99 of
    particles)? hopes of exploring the early, dense
    stage
  • x-space is poorly reproduced
  • model source lives too long and disintegrates too
    slowly?
  • Correct dynamics signatures with wrong space-time
    dynamics?
  • Turn to richer dynamics of non-central collisions
    for more detailed information

Heinz Kolb, hep-th/0204061
4
Noncentral collision dynamics
hydro evolution
  • Dynamical models
  • x-anisotropy in entrance channel ? p-space
    anisotropy at freezeout
  • magnitude depends on system response to pressure

5
Effect of dilute stage
hydro evolution
  • hydro reproduces v2(pT,m) (details!) _at_ RHIC for
    pT lt 1.0 GeV/c
  • system response ? EoS
  • early thermalization indicated
  • dilute hadronic stage (RQMD)
  • little effect on v2 _at_ RHIC

Teaney, Lauret, Shuryak, nucl-th/0110037
6
Effect of dilute stage
hydro evolution
  • hydro reproduces v2(pT,m) (details!) _at_ RHIC for
    pT lt 1.5 GeV/c
  • system response ? EoS
  • early thermalization indicated
  • dilute hadronic stage (RQMD)
  • little effect on v2 _at_ RHIC
  • significant (bad) effect on HBT radii

calculation Soff, Bass, Dumitru, PRL 2001
7
Effect of dilute stage
hydro evolution
  • hydro reproduces v2(pT,m) (details!) _at_ RHIC for
    pT lt 1.5 GeV/c
  • system response ? EoS
  • early thermalization indicated
  • dilute hadronic stage (RQMD)
  • little effect on v2 _at_ RHIC
  • significant (bad) effect on HBT radii
  • related to timescale? - need more info

Teaney, Lauret, Shuryak, nucl-th/0110037
8
Effect of dilute stage
hydro evolution
  • hydro reproduces v2(pT,m) (details!) _at_ RHIC for
    pT lt 1.5 GeV/c
  • system response ? EoS
  • early thermalization indicated
  • dilute hadronic stage (RQMD)
  • little effect on v2 _at_ RHIC
  • significant (bad) effect on HBT radii
  • related to timescale? - need more info
  • qualitative change of freezeout shape!!
  • important piece of the puzzle!

Teaney, Lauret, Shuryak, nucl-th/0110037
9
Possible to see via HBT relative to reaction
plane?
  • for out-of-plane-extended source, expect
  • large Rside at 0?
  • small Rside at 90?

2nd-order oscillation
Rs2 no flow expectation
fp
10
Traditional HBT - cylindrical sources
Decompose q into components qLong in beam
direction qOut in direction of transverse
momentum qSide ? qLong qOut
(beam is into board)
11
Anisotropic sources? Six HBT radii vs f
  • explicit and implicit (xmxn(f)) dependence on f

Wiedemann, PRC57 266 (1998).
12
Symmetries of the emission function
Heinz, Hummel, MAL, Wiedemann, nucl-th/0207003
13
Fourier expansion of HBT radii _at_ Y0
Insert symmetry constraints of spatial
correlation tensor into Wiedemann relations
and combine with explicit F-dependence
Note These most general forms of the Fourier
expansions for the HBT radii are preserved when
averaging the correlation function over a finite,
symmetric window around Y0. Relations between
the Fourier coefficients reveal interplay between
flow and geometry, and can help disentangle space
and time
Heinz, Hummel, MAL, Wiedemann, nucl-th/0207003
14
Anisotropic HBT results _at_ AGS (?s2 AGeV)
AuAu 2 AGeV E895, PLB 496 1 (2000)
xside
xout
K
fp 0
  • strong oscillations observed
  • lines predictions for static (tilted)
    out-of-plane extended source ? consistent with
    initial overlap geometry

15
Meaning of Ro2(f) and Rs2(f) are clearWhat about
Ros2(f) ?
AuAu 2 AGeV E895, PLB 496 1 (2000)
fp 0
fp 45
  • Ros2(f) quantifies correlation between xout and
    xside
  • No correlation (tilt) b/t between xout and xside
    at fp0 (or 90)
  • Strong (positive) correlation when fp45
  • Phase of Ros2(f) oscillation reveals orientation
    of extended source

16
Indirect indications of x-space anisotropy _at_ RHIC
  • v2(pT,m) globally well-fit by hydro-inspired
    blast-wave

temperature, radial flow consistent with fits to
spectra
?
anisotropy of flow boost
spatial anisotropy (out-of-plane extended)
STAR, PRL 87 182301 (2001)
17
STAR data AuAu 130 GeV minbias
  • significant oscillations observed
  • blastwave with same parameters as used to
    describe spectra v2(pT,m)
  • additional parameters
  • R 11 fm
  • ? 2 fm/c !!

preliminary
18
STAR data AuAu 130 GeV minbias
no spatial anisotropy
  • significant oscillations observed
  • blastwave with same parameters as used to
    describe spectra v2(pT,m)
  • additional parameters
  • R 11 fm
  • ? 2 fm/c !!

preliminary
  • both flow anisotropy and source shape contribute
    to oscillations, but
  • geometry dominates dynamics
  • freezeout source out-of-plane extended? fast
    freeze-out timescale !


19
Azimuthal HBT hydro predictions
  • RHIC (T0340 MeV _at_ t00.6 fm)
  • Out-of-plane-extended source (but flips with
    hadronic afterburner)
  • flow geometry work together to produce HBT
    oscillations
  • oscillations stable with KT

(note RO/RS puzzle persists)
Heinz Kolb, hep-th/0204061
20
Azimuthal HBT hydro predictions
  • RHIC (T0340 MeV _at_ t00.6 fm)
  • Out-of-plane-extended source (but flips with
    hadronic afterburner)
  • flow geometry work together to produce HBT
    oscillations
  • oscillations stable with KT
  • LHC (T02.0 GeV _at_ t00.1 fm)
  • In-plane-extended source (!)
  • HBT oscillations reflect competition between
    geometry, flow
  • low KT geometry
  • high KT flow

sign flip
Heinz Kolb, hep-th/0204061
21
HBT(f) Results 200 GeV
  • Oscillations similar to those measured _at_ 130GeV
  • 20x more statistics ?explore systematics in
    centrality, kT
  • much more to come

STAR PRELIMINARY
22
Summary
  • Quantitative understanding of bulk dynamics
    crucial to extracting real physics at RHIC
  • p-space - measurements well-reproduced by models
  • anisotropy ? system response to compression (EoS)
  • probe via v2(pT,m)
  • x-space - generally not well-reproduced
  • anisotropy ? evolution, timescale information,
    geometry / flow interplay
  • Azimuthally-sensitive HBT correlating quantum
    correlation with bulk correlation
  • reconstruction of full 3D source geometry
  • Freezeout geometry out-of-plane extended
  • early (and fast) particle emission !
  • consistent with blast-wave parameterization of
    v2(pT,m), spectra, R(pT), K-p
  • With more detailed information, RHIC HBT puzzle
    deepens
  • what about hadronic rescattering stage? - must
    occur, or?
  • does hydro reproduce ?t? or not??
  • right source shape via oscillations, but misses
    RL(mT)
  • Models of bulk dynamics severely
    (over?)constrained
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