Sergei’s 60 th Birthday
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Transcript of Sergei’s 60 th Birthday
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by Art PoskanzerPresented by Hans Georg Ritter
Sergei’s 60th Birthday
16 Nov 13
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Sergei at Work
recent at Wayne State
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Happy Sergei
2008 at Jaipur2002 at MSU
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Sergei Exploring the Unknown
Sergei discovering new physics
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This Talk About Sergeil Highlights that I know
n By yearl Apologies to his co-workersl Mistakes are all mine
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First In-Plane Elliptic Flow
Peaks at 0, pi, and 2pi
AGS E8771994
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First Elliptic Flow, v2
AGS E8771994
v1
v2
v4
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Acceptance Correlationsl Flattening of the Event Plane angle
n Phi Weightingn Recenteringn Shifting
1996
before
after
Flattening the azimuthal distributionof the event plane removes correlationfrom non-uniform acceptance
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Correlation of Q2 with Q1
Black dots, relative to first harmonic,Indicate In-Plane Elliptic Flow
1997
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Negative v1 at Low pT1997
Occurs for heavy particleswith large radial flow
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Methods for analyzing anisotropic flow in relativistic nuclear collisions
50 papers/yearreference the method
Phys. Rev. C 58 1671
A. M. Poskanzer and S. A. Voloshin625 citations from inSPIRE:950 citations from Google
Few author paper.Not a review paper.
1998
Sergei should have beenfirst author, but he insistedthat it be alphabetic.
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Event Plane Resolution
as a function of signal strength and square-root of the multiplicity
for k=1, the plane and particles have the same harmonic
1998
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Scaled v2 vs Transverse Particle Density
1999
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Wiggle of v1 vs rapidity
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z
x
Radial flow
<x px> > 0
rapidity
px, v1
x
rapidity
px
x
Baryon stopping
“wiggle”
2000
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STAR Elliptic Flow
2nd harmonic
1st harmonic
2001re
solu
tion
centrality
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Discovery of Elliptic Flow at RHIC
22k events
We worked one whole weekendand came up with this graph
STAR, PRL 86, 402 (2001)
2001
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First RHIC Collective Flow
Raimond Snellings, Sergei Voloshin, and Art Poskanzer
2000
All Happy
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Coalescencel It’s the quarks that flow
n Mesons twice as muchn Baryons three times as much
Mesons and baryons on thesame curve when scaledby the number of quarks
2003
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Use p+p to Estimate Non-Flow2003
All non-flow
Non-flow athigh pT
v2
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Bessel-Gaussianl Gaussian fluctuations give al Bessel-Gaussian distributionl of Qn in Participant Plane
2008
Correlations of more than four particles do not add any information
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Some of Sergei’s Firsts Fourier harmonics 1994 In-plane elliptic flow (at the AGS) 1994 Event plane flattening 1996 Shape of the q-distribution Negative vn at low pT 1997 Event plane resolution correction made
for each harmonic 1998n Unfiltered theory can be compared to
experiment!l Mixed harmonics Use directed and elliptic flow for v1 and v2 RHIC Elliptic Flow 2000
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More of Sergei’s Firstsl v1(y) wiggle 2000l v2{4} from Q-cumulantsl Near-side ridge due to fluctuationsl azHBT proposal Coalescence of constituent quarks 2002
Scaling with number of constituent quarks Use p+p to estimate non-flow 2003l Global polarization proposall Proposed method for strong parity
violation (chiral magnetic effect) Bessel-Gaussian fluctuations 2008
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Still More of Sergei’s Firstsl Event shape engineering 2012l More ...l
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Sergei as a Colleaguel We worked together very welll I would ask a question
n Sergei would thinkn Then answer with great depthn All questions were taken seriously
l Very modestl Wonderful colleaguel Very careful to give credit to others
n But colleagues not listed in this talk
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Bonner Prize
l My only regret:n that Sergei did not share it with me
l In our joint workn All the good ideas have come from Sergei
l He deserves itn Hope he still gets it
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Happy 60th