Collectivity makes the world go around

Kai SchwedaPhysikalisches Institut

University of Heidelberg / GSI Darmstadt

3/15/13Hans Georg Ritter Symposium

RNC group in 2001Ian Johnson Fabrice Retiere Art Poskanzer Nu Xu student from South Africa

David Hardtke Peter Jacobs Jay Marx Howard Wieman Jim Thomas

3/15/13 2/5

Jennifer Klay Jinghua Fu Eugene Yamamoto Masashi Kaneta Falk Meissner Hans Georg

Howard Matis Kirill Filimonov me Grazyna Odyniec

on top of the world Hans Georg

high-energy nucleus-nucleus collisions

central collision

collision happens heresize ~10fm

4000 charged particles

illuminates TPC volumesize ~4m

STAR year 2 data

3/15/13 6/24

White papers - STAR: Nucl. Phys. A757, p102.

Hans Georg Ritter Symposium

Collectivity observed in spectra

3/15/13 7/24STAR: Phys. Rev. C70, 041901(R).

strongly curved strong flow

exponential no flow

Hans Georg Ritter Symposium

More

centr

al co

llisi

ons

matter flows - collectivity

3/15/13 8/24

STAR Data: Nucl. Phys. A757, (2005) 102.

Nu Xu plot 2.0

strange matter flows

bulk matter flows

partonic collectivity ?Hans Georg Ritter Symposium

Anisotropy Parameter v2

y

x

py

px

coordinate-space-anisotropy momentum-space-anisotropy

Initial/final conditions, EoS, degrees of freedom

discovery of partonic collectivity

10/24PHENIX, PRL 98, 162301 (2007)

STAR, PRL 95, 122301 (2005)

S. Voloshin, QM02, 379c (2003)

elliptic flow of (multi-) strange

and

and

quark number scaling:

first observed in and K0S

PhD theses of Jinghua Fu,

Wuhan/LBNL and Paul

Sorensen, UCLA/LBNL

partonic collectivity

STAR, PRC 75, 054906 (2007)STAR, PRL 95, 122301 (2005)

higher harmonics

3/15/13 Hans Georg Ritter Symposium 11/24

• extract power spectrum of vn,

like WMAP*

• higher harmonics

• odd harmonics important

• v3: access /s

STAR, arXiv:1301.2187 [nucl-ex];

STAR, PRL 92 (2004) 062301;

A.Mocsy and P. Sorensen, NPA 855 (2011) 241;

B. Alver and G. Roland, PRC 81 (2010) 054904;

*WMAP data: The NASA/WMAP Science team;

http://map.gsfc.nasa.gov/media/080997/index.html.

QGP plot: B. Schenke, S. Jeon, and C. Gale, arXiV:1109.6289.

everything counts in large amounts

3/15/13 12/24Hans Georg Ritter Symposium

M. Sumbera, arXiv:1301.7224 [nucl-ex].

entering the anti-world

3/15/13 13/24Hans Georg Ritter Symposium

• anti-alpha discovered

• rarest signal in HI ever observed (2/108)

STAR, Nature 473 (2011) 353.

STAR: key to success

3/15/13 Hans Georg Ritter Symposium 14/24

large data

sets

large acceptance

low-pT

coverage

excellent PID

Hans Georg

Go heavy or go home !

3/15/13 Hans Georg Ritter Symposium 15/24

X. Zhu, M. Bleicher, S.L. Huang, K.S., H. Stöcker,N. Xu, and P. Zhuang, PLB 647 (2007) 366.

• new scale:

mc,b » QCD

• mc,b ≈ const.

• mu,d,s ≠ const.

Where does all the charm go ?

• Total charm cross section: open-charmed hadrons,

e.g. D0, D+, D*+, c, … and c,b e() + X

• Quarkonia, e.g. J/ carries 1% of total charm

3/15/13 Hans Georg Ritter Symposium 16/24

D0D±

Ds

c

J/(charmonium)

D*+

Open-charm production

3/15/13 Hans Georg Ritter Symposium 17/24

• at RHIC: large

combinatorial

background

• PhD thesis

Xin Dong USTC/LBNL

• STAR upgrade with Heavy

Flavor Tracker will

impose high precisionSTAR, PRD 85 (2012) 092010; ALICE, JHEP 1207 (212) 191.

Heavy-quark detection

3/15/13 Hans Georg Ritter Symposium 18/24

• golden channel: D0 K- + ,

c = 123 m

• displaced decay vertex is

signature of heavy-quark

decay

plot: courtesy of D. Tlusty.

Heavy Flavor Tracker

3/15/13 19/5

SSD

IST

PXL

HFT

Hans Georg Ritter Symposium

The Heavy Flavor Tracker for STAR• Hans Georg with an HFT prototype

• 10 m precision demonstrated

• 10 weeks of running in 2014 will decisively address open charm at RHIC

some more statistics

3/15/13 Hans Georg Ritter Symposium 21/24

• STAR white paper:

Nucl. Phys. A757 (2005) 102 1581

- most cited RHIC paper

- most cited HI experimental paper

• Bjorken, PRD 27 (1983) 127 2023

• Mastsui and Satz, PLB 178 (1986) 416 1719

populating the world …

Dan Cebra Javier Castillo Xin Dong Kirill Filimonov Jinghua Fu Tom GutierrezDavis CEA LBNL Berkeley Wuhan San Luis Obispo

Ian Johnson Masashi Kaneta Jennifer Klay Marco v. Leuween Mike Lisa Spiros MargetisPSI Tohoku San Luis Obispo Utrecht Ohio State Kent State

Sevil SalurRutgers

Joakim Nystrand Joern Putschke Fabrice Retiere Lijuan Ruan ks Raymond SnellingsBergen Wayne State Triumf BNL Heidelberg Utrecht

PaulSorensenBNL

FuqiangWangPurdue

BedangadasMohantyBhubaneswar

some personal remarks

o ‘cultural shock’: - flat hierarchies, informal style

- took me 6 months to get over it

o can you think about charm ?Hans Georg in 2001

o Berkeley style: - people doing the work are getting

exposed, i.e. plenary talks, committees, …

3/15/13 Hans Georg Ritter Symposium

Happy 69½ Birthday,Hans Georg !

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