1. Recent results from PHENIX
on identified particles and flow
David Morrison
Brookhaven National Laboratory
for the PHENIX Collaboration

2. 13 62
550
Countries
Institutions
Participants

4. Put the results together
Y. Akiba QM’05
The matter is dense
The matter is strongly coupled
PHENIX preliminary
The matter modifies jets
The matter may melt but regenerate J/y’s
The matter is hot

5. over 800 physics figures gained “PHENIX Preliminary” status last year
Busy days in PHENIX
p+p
d+Au
Au+Au
Cu+Cu
22.4 GeV ?
62.4 GeV
130 GeV
200 GeV
Run 1 - 3
Run 4 - 5
Run 6 (?)
over 800 physics figures gained “PHENIX Preliminary” status last year

6. 1/15/2019
David Morrison, SQM'06

7. g g
h±,e±
h±,e±
1/15/2019
David Morrison, SQM'06

8. Quantifying a medium effect
yield in A+A/number of equivalent p+p collisions
RAA =
yield in p+p

9. Au+Au sNN = 200 GeV Phys. Rev. C69, 034910 (2004)
high pT unidentified
hadrons (h±) and p
have similar suppression
Phys. Rev. C69, (2004)
1/15/2019
David Morrison, SQM'06

10. Au+Au sNN = 200 GeV nucl-ex/0601037 high pT unidentified
hadrons (h±) and p
have similar suppression,
h suppression shows
quenching independent
of identity of
produced hadron
nucl-ex/
1/15/2019
David Morrison, SQM'06

11. Comparison across systems
similar pattern
across centralities
suggests similar
effect of medium
nucl-ex/
1/15/2019
David Morrison, SQM'06

12. Cu+Cu sNN = 200 GeV smaller system, smaller effect: about 0.5 in
central Cu+Cu,
cf. 0.2 in
central Au+Au
1/15/2019
David Morrison, SQM'06

13. Au+Au and Cu+Cu sNN = 200 GeV
1/15/2019
David Morrison, SQM'06

14. Au+Au and Cu+Cu sNN = 200 GeV
1/15/2019
David Morrison, SQM'06

15. Connecting with 0 RAA at SPS
similar Npart
similar sNN
1/15/2019
David Morrison, SQM'06

16. 200 or 62.4 GeV – but from just 39 hours of running
not quite the
pT reach of
200 or 62.4 GeV – but from just 39 hours of running
PHENIX Preliminary
1/15/2019
David Morrison, SQM'06

17. RAA as a function of sNN
1/15/2019
David Morrison, SQM'06

18. RAA as a function of sNN
Cu+Cu 22.5 GeV
Cu+Cu 62.4 GeV
PHENIX Preliminary
PHENIX Preliminary
1/15/2019
David Morrison, SQM'06

19. p/ varies with sNN in Cu+Cu
PHENIX Preliminary
PHENIX Preliminary
decreasing effect of initial protons, increasing baryon “anomaly”
1/15/2019
David Morrison, SQM'06

20. Multi-hadron final states
e.g., w,h p+p-p0
compare whadrons, wdielectrons
difficult acceptance, efficiency
aided by h gg
same techniques applied to Ks0p0p0
i.e., gggg in EMCal
compare with lower pT charged K and STAR measurement of Ks0
p+p, d+Au
Sasha Milov, SQM’06

21. Anisotropic initial conditions
An idea with some history: Ann. Phys. 6, 1 (1959)
PRL 32, 741 (1974)
1/15/2019
David Morrison, SQM'06

22. Anisotropic initial conditions
An idea with some history: Ann. Phys. 6, 1 (1959)
PRL 32, 741 (1974)
1/15/2019
David Morrison, SQM'06

23. Anisotropic initial conditions
An idea with some history: Ann. Phys. 6, 1 (1959)
PRL 32, 741 (1974)
1/15/2019
David Morrison, SQM'06

24. Anisotropic initial conditions
An idea with some history: Ann. Phys. 6, 1 (1959)
PRL 32, 741 (1974)
1/15/2019
David Morrison, SQM'06

25. Anisotropic initial conditionsx y z
An idea with some history: Ann. Phys. 6, 1 (1959)
PRL 32, 741 (1974)
1/15/2019
David Morrison, SQM'06

26. Anisotropic initial conditions
An idea with some history: Ann. Phys. 6, 1 (1959)
PRL 32, 741 (1974)
1/15/2019
David Morrison, SQM'06

27. Anisotropic initial conditions
An idea with some history: Ann. Phys. 6, 1 (1959)
PRL 32, 741 (1974)
1/15/2019
David Morrison, SQM'06

28. absorption anisotropy
Anisotropy at high pT
geometry-driven
momentum anisotropy
geometry-driven
absorption anisotropy
Maya Shimomura, SQM’06

29. Data from minimum bias Au+Au collisions at sNN= 200 GeV
PHENIX Preliminary
(mT - m0)
1/15/2019
David Morrison, SQM'06

30. Data from minimum bias Au+Au collisions at sNN= 200 GeV
PHENIX Preliminary
(mT - m0)
1/15/2019
David Morrison, SQM'06

31. Single electron v2 Shingo Sakai, SQM’06 Andrew Glenn, SQM’06
Greco, Ko, Rapp PLB 595 (2004) 202
Shingo Sakai, SQM’06
Andrew Glenn, SQM’06

32. 1/15/2019
David Morrison, SQM'06

33. Comprehensive and Detailed
Value of large datasets
divide by RP, centrality, PID
Value of precision
better statistics, references
Varied system size and collision energy
connection to SPS results
turn-on of observables
centrality, geometry systematics
Particle ID helps significantly clarify underlying physics
e.g., RAA for h, p
More and more comprehensive picture of RHI physics
e.g., anisotropy vs pT
added weight to partonic description, importance of collective phenomena
1/15/2019
David Morrison, SQM'06

34. Extra slides
1/15/2019
David Morrison, SQM'06

35. 1/15/2019
David Morrison, SQM'06

36. Partonic flow?
Consistent with a picture of flow being largely established at partonic level
M. Oldenburg (QM’05)

37. central
Ncoll = 975  94

38. Glauber* models Roy Glauber, meet ... Alfred Nobel Woods-Saxon nuclear
density distributions
Straight line nucleon
trajectories
Variety of ways to make
correspondence with exp’t
*Would be better to call our
approach “Glauber-inspired”
PHOBOS Glauber MC
Roy Glauber, meet ... Alfred Nobel

39. Jet shape vs centrality
PHENIX preliminary
J. Jia
1/15/2019
David Morrison, SQM'06

40. Jet shape vs centrality
PHENIX preliminary
J. Jia
1/15/2019
David Morrison, SQM'06

41. Jet shape vs centralityD
PHENIX preliminary
J. Jia
Near side : broadening, Away side: splitting

42. A. Adare

43. 2
A–C C A B
A–B 2

44. subtract off lower order
3-particle cumulant:
subtract off lower order
correlations
Au+Au 10%
difference in Au+Au
average signal per radian2:
center – corner =
0.3 ± 0.3 (stat) ± 0.4 (syst)
center – cone =
2.6 ± 0.3 (stat) ± 0.8 (syst)
J. Ulery (QM’05)
1/15/2019
David Morrison, SQM'06

45. Changing the geometry both cases: 100 participants
different ellipticity
odd harmonics
Au+Au
Cu+Au

46. Elliptic flow in Au+Au and Cu+Cu
PHOBOS preliminary
G. Roland (QM’05)

47. Off the beaten path
1/15/2019
David Morrison, SQM'06

48. A Perfect fluid? Hydrodynamic flow in idealized case
is isentropic: no entropy growth A Dx v
P. Stankus

49. Entropy grows
Volume and velocity are constant, so power heats fluid, generating entropy
The fractional rate of increase in entropy is proportional to /s; the smaller this is, the smaller the increase in entropy, and the closer to “perfect” the fluid is.

50. Low viscosity or high entropy?
sQGP is viscous, but its high entropy density compensates
Gyulassy, Hirano nucl-th/

51. Flow of identified particles
Hydro:
P. Huovinen,
priv. comm. (2004)
M. Oldenburg (QM’05)