2 particle correlation at rhic
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2-particle correlation at RHIC. Fabrice Reti è re, LBNL for the STAR collaboration. Hydro at RHIC Rather successful for spectra and elliptic flow But, cannot describe pion HBT A blast wave model? Very strong flow Short emission duration.

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2-particle correlation at RHIC

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2 particle correlation at rhic

2-particle correlation at RHIC

Fabrice Retière, LBNL

for the STAR collaboration


Outlines

Hydro at RHIC

Rather successful for spectra and elliptic flow

But, cannot describe pion HBT

A blast wave model?

Very strong flow

Short emission duration

More constraints : new 2-particle correlations from STAR

Pion HBT with respect to the reaction plane

Kaon HBT

Kaon – pion correlations

Outlines


Pion hbt explained in a blast wave scenario

Blast wave features

Interplay between flow and temperature

Correlation position - momentum

Short emission duration

Kt = pair Pt

Rside

Rout

Pion HBT explained in a blast wave scenario

Data, Phys.Rev.Lett. 87, 082301 (2001)

bt

6

5

p+

p-

Rout (fm)

4

R

6

5

Model :

R = 13.5 fm, t = 1.5 fm/c

T = 110 MeV, <bt> = 0.52c

Rside (fm)

4

Hydro lower limit

1

Rout/Rside

0.9

0.8

0.3

0.1

0.2

Pt (GeV/c)


Other blast wave model success spectra and elliptic flow

Additional features for v2

Momentum and position anisotropy

p

Other blast wave model successSpectra and elliptic flow

STAR preliminary

-

K-

1/mT dN/dmT (a.u.)

Submitted to PRL

Masashi Kaneta

mT - m[GeV/c2]

A. Poskanzer, R. Snellings, S.Voloshin


Hbt and elliptic flow

Oscillations

From flow

From space asymmetry

HBT and Elliptic flow

Rside2 (fm2)

without flow

Only space asymmetry

f=90 degree

Rout small

Rside large

f=0 degree

Rout large

Rside small

In plane example

f (deg)


Hbt and elliptic flow result from star

Clear in-plane oscillation

Blast wave fit

R=10 fm, T=110 MeV, <bt> = 0.52c

Consistent with other measurements

Favor a scenario with an anisotropy both in space and momentum

HBT and Elliptic flowResult from STAR

STAR preliminary

Randy Wells, Mike Lisa


More constraints to the blast wave model mass dependence

More constraints to the blast wave model : mass dependence

Blast wave

(a.u.)

p

K

p

0.6

0.5

NA44 @ SPS

PRL 87 (2001) 112301

0.4

0.

0.

0.2

0.4

0.6

0.8

1.

1.2

mT (GeV/c2)


Mass scaling kaon hbt

Rinv = 4.5 ± 0.3 fm (stat)

Coming soon 2D/3D HBT

Needed for comparison to the blast wave model

Mass scaling?Kaon HBT

C(Qinv)

STAR preliminary

Qinv (GeV)

Sergei Panitkin


Kaon pion correlation

Static sphere :

R= 7 fm ± 2 fm (syst+stat)

Blast wave

T = 110 MeV (fixed)

<bt> = 0.52c (fixed)

R = 13 fm ± 4 fm (syst+stat)

Consistent with other measurements

Kaon – pion correlation

STAR preliminary


Probing the space time emission asymmetry

Probing the space-time emission asymmetry

Catching up

 Large interaction time

 Large correlation

Moving away

 Small interaction time

 Small correlation

  • Ratio

  • Sensitive to the space-time asymmetry

Kinematics selection


Space time asymmetry

Evidence of a space – time asymmetry

tp-tK ~ 4fm/c ± 2 fm/c, static sphere

Consistent with “default” blast wave calculation

Space-time asymmetry

STAR preliminary

Pion

<pt> = 0.12 GeV/c

Kaon

<pt> = 0.42 GeV/c


Conclusions and outlook

New measurements from STAR :

Pion HBT with respect to reaction plane

Kaon HBT

Kaon-pion CF

Qualitative agreement with a blast wave scenario

But, so far, cannot be achieved by any hydro or microscopic model

Next

Pion HBT

@ 200 GeV (and others)

More statistics for reaction plane dependence

Different mass

3D K+,K- , proton, K0s, L

More non-identical

Pion-proton

Proton-L @ 200GeV

Pion-X- @ 200GeV?

Conclusions and outlook


First sign of emission asymmetry @ rhic

First sign of emission asymmetry @ RHIC


Strong flow and short emission duration at rhic

Consistent with

Spectra

Elliptic flow

Pion HBT

Pion HBT wrt reaction plane

Pion – kaon correlation function

Question for theorists

How to get there?

Strong flow and short emission duration at RHIC

Kaon

<pt> = 0.42 GeV/c

Pion

<pt> = 0.12 GeV/c


Back up

Back up


Kaon hbt

Kaon Hbt

7 MeV/c bins

Positive Kaons, Mult 3 (~11% Central), Pt 150-400 MeV/c, |y|<0.3

Qinv (GeV/c)


Kaon hbt and coulomb

Kaon Hbt and coulomb


Chi2 contour

Chi2 contour

Tth[GeV]

Tth[GeV]

s [c]

s [c]


2 particle correlation at rhic

color: c2 levels

from HBT data

error contour from

elliptic flow data


Equations

Equations


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