1 by Art Poskanzer Presented by Hans Georg Ritter Sergei’s 60 th Birthday 16 Nov 13

Sergei at Work 2 recent at Wayne State

Happy Sergei at Jaipur 2002 at MSU

Sergei Exploring the Unknown 4 Sergei discovering new physics

This Talk About Sergei Highlights that I know By year Apologies to his co-workers Mistakes are all mine 5

First In-Plane Elliptic Flow 6 Peaks at 0, pi, and 2pi AGS E

First Elliptic Flow, v 2 7 AGS E v1v1 v2v2 v4v4

Acceptance Correlations Flattening of the Event Plane angle Phi Weighting Recentering Shifting before after Flattening the azimuthal distribution of the event plane removes correlation from non-uniform acceptance

Correlation of Q2 with Q1 9 Black dots, relative to first harmonic, Indicate In-Plane Elliptic Flow 1997

Negative v 1 at Low p T Occurs for heavy particles with large radial flow

Methods for analyzing anisotropic flow in relativistic nuclear collisions papers/year reference the method Phys. Rev. C A. M. Poskanzer and S. A. Voloshin 625 citations from inSPIRE: 950 citations from Google Few author paper. Not a review paper Sergei should have been first author, but he insisted that it be alphabetic.

Event Plane Resolution 12 as a function of signal strength and square-root of the multiplicity for k=1, the plane and particles have the same harmonic 1998

Scaled v 2 vs Transverse Particle Density

Wiggle of v 1 vs rapidity 14 z x Radial flow  > 0 rapidity p x, v 1 x rapidity pxpx x Baryon stopping “wiggle” 2000

STAR Elliptic Flow 15 2nd harmonic 1st harmonic 2001 resolution centrality

Discovery of Elliptic Flow at RHIC 16 22k events We worked one whole weekend and came up with this graph STAR, PRL 86, 402 (2001) 2001

First RHIC Collective Flow 17 Raimond Snellings, Sergei Voloshin, and Art Poskanzer 2000 All Happy

Coalescence It’s the quarks that flow Mesons twice as much Baryons three times as much 18 Mesons and baryons on the same curve when scaled by the number of quarks 2003

Use p+p to Estimate Non-Flow All non-flow Non-flow at high p T v2v2

Bessel-Gaussian Gaussian fluctuations give a Bessel-Gaussian distribution of Q n in Participant Plane Correlations of more than four particles do not add any information

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 v n at low p T 1997  Event plane resolution correction made for each harmonic 1998 Unfiltered theory can be compared to experiment! Mixed harmonics  Use directed and elliptic flow for v 1 and v 2  RHIC Elliptic Flow

More of Sergei’s Firsts v 1 (y) wiggle 2000 v 2 {4} from Q-cumulants Near-side ridge due to fluctuations azHBT proposal  Coalescence of constituent quarks 2002 Scaling with number of constituent quarks  Use p+p to estimate non-flow 2003 Global polarization proposal Proposed method for strong parity violation (chiral magnetic effect)  Bessel-Gaussian fluctuations

Still More of Sergei’s Firsts Event shape engineering 2012 More... 23

Sergei as a Colleague We worked together very well I would ask a question Sergei would think Then answer with great depth All questions were taken seriously Very modest Wonderful colleague Very careful to give credit to others But colleagues not listed in this talk 24

Bonner Prize My only regret: that Sergei did not share it with me In our joint work All the good ideas have come from Sergei He deserves it Hope he still gets it 25

26 Happy 60 th