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Helen Caines OSU – March 2001 STAR K R out R side Measuring the Source “Size” (HBT) 2 2 2 1 1 1 x y ip x y ip e e ~ ~5 fm x 1 x 2 y 1 y 2 ~1 m 1 2 2 2 1 1 x y ip x y ip e e ) x p cos( 1 ~ ) p , p ( P * 2 1 C (Qinv) Qinv (GeV/c) 1 2 0.05 0.10 Width ~ 1/R 1D: overall rough “size” 3D decomposition of relative momentum provides handle on shape and time as well as size

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Measuring the Source “Size” (HBT). 1D: overall rough “size”. y 1. x 1. K . y 2. ~1 m. x 2. R out. R side. ~5 fm. 3D decomposition of relative momentum provides handle on shape and time as well as size. HBT and the Phase Transition. with transition. without transition. “ e ”. - PowerPoint PPT Presentation

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Page 1: DocumentK

Helen Caines

OSU – March 2001STAR

K

RoutRside

Measuring the Source “Size” (HBT)

222111 xyipxyip ee~

~5 fm

x1

x2

y1

y2 ~1 m 122211 xyipxyip ee

)xpcos(1~)p,p(P *21

C (Q

inv)

Qinv (GeV/c)

1

2

0.05 0.10

Width ~ 1/R

1D: overallrough “size”

3D decomposition of relative momentum provides handle on shape and time as well as size

Page 2: DocumentK

Helen Caines

OSU – March 2001STAR

HBT and the Phase Transition

withouttransition

“”

withtransition

c

Rischke & GyulassyNPA 608, 479 (1996)

Generic prediction of 3D hydrodynamic models

Primary HBT “signature” of QGP

~ emission

timescale

Phase transition longer lifetime; Rout/Rside ~ 1 + ()/Rside

Page 3: DocumentK

Helen Caines

OSU – March 2001STAR

Two-particle interferometry (HBT)

• Correlation function for identical bosons:

• 1d projections of 3d Bertsch-Pratt• 12% most central out of 170k

events• Coulomb corrected• |y| < 1, 0.125 < pt < 0.225

qout

STAR preliminary

STAR preliminary

qlong

fmR

fmR

fmR

Long

Side

Out

)21.012.007.7(

)16.009.047.5(

)23.011.086.5(

03.001.050.0

Page 4: DocumentK

Helen Caines

OSU – March 2001STAR

Radii dependence on centrality and kt

•Radii increase with multiplicity - Just geometry (?)

•Radii decrease with kt – Evidence of flow (?)

low kT central collisions

“multiplicity”

STAR preliminary

x (fm)

y (f

m)

Page 5: DocumentK

Helen Caines

OSU – March 2001STAR

Pion HBT Excitation Function

• Central AuAu (PbPb)

• Decreasing parameter

• Decreased correlation

strength

• More baryon resonances ?

• Saturation in radii

• Geometric or dynamic

(thermal/flow) saturation

• No jump in effective lifetime

• No significant rise in size of the emitting source

• Lower energy running needed!

STAR Preliminary

Compilation of world 3D -HBT parameters as a function of s

Page 6: DocumentK

Helen Caines

OSU – March 2001STAR

2/)( 21TTT ppK

STAR

Preliminary

Tomášik, Heinz nucl-th/9805016

=0.0

=0.5

opaqueness

The ROut/RSide Ratio

Emission duration for transparent sources:

TSideOut RR 22

Small radii + short emission time + opaqueness short freeze-out


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