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

Fabrice Retière, 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

More constraints : new 2-particle correlations from STAR

Pion HBT with respect to the reaction plane

Kaon HBT

Kaon – pion correlations

Outlines


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)


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


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)


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

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)


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


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

Catching up

 Large interaction time

 Large correlation

Moving away

 Small interaction time

 Small correlation

  • Ratio

  • Sensitive to the space-time asymmetry

Kinematics selection


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


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


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


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


Chi2 contour

Tth[GeV]

Tth[GeV]

s [c]

s [c]


color: c2 levels

from HBT data

error contour from

elliptic flow data


Equations


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