# Presentation: 818611

## Highlights from PHENIX I:looking into the center of the colored matterAchim Franz, BNLfor the PHENIX Collaboration

- Highlights from PHENIX I:looking into the center of the colored matterAchim Franz, BNLfor the PHENIX Collaboration

- Quark Matter Feb. 2008 - Jaipur, India

## QM87 - Nordkirchen

- Z.Phys. C 38, 51

- Z.Phys. C 38, 79

- First look at global variables
- Multiplicity
- Transverse Energy
- HBT
- J/

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## News

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## PHENIX Data-Sets

**Collided 4 different species in 8 years:  AuAu, dAu, pp, CuCu**
**6 energies run:  9.2 GeV, 19 GeV, 22.5 GeV, 62.4 GeV, 130 GeV, 200 GeV**

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## PHENIX Data-Sets

- TOF-W: MultiGapResistive Plate chambers with strip readout, ~75ps time resolution,
- PID at high pT

- Muon Piston Cal:400 PbWO4 crystalsForward physics in ppReaction plane determination in AA3.1< || < 3.7

- Reaction Plane Detector: 2 x 2 rings with 12 scintillator counters each.Reaction plane determination in AATrigger counter for low energy runs = 1.0  1.5,  = 1.5  2.8

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Global Variables

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## meson pT spectra - p p

- Fit only 0’s with modified Hagedorn function, then apply only mT scaling to describe other spectra. Absolute scale only fit parameter.
- many different detection and analysis methods, PHENIX is a very versatile detector.

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Transverse Energy

- dET/dNpart
- inceases with √s and Npart

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

- Phys.Rev.C 76, 034903 (2007)
- K.Homma, Session XVII, 02/09 15:20h

- Multiplicity Fluctuations -  space

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Particle Ratio Fluctuations

- K.Homma, Session XVII, 02/09 15:20h
- Poster by E.Haslum

- Fluctuation in the ratio of two particle species:
- dyn    = 0 : only statistical fluctuations
-  dyn  > 0 : larger fluctuations
-  dyn < 0 : damped fluctuations

- C. Pruneau, S.Gavin, S.Voloshin, Phys. Rev. C 66 044904 (2002)

- Particle ratio fluctuation show no indication of critical behaviour

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## HBT

- 3D source imaging reconstructs source parameters

- reverse engineer the correlation function by an input source function.

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Deuterons - B2

- Detailed d and d pT spectra in multiple centralities
- RUN07 TOF-W

- H.Valle, Session I, 02/05 15:20h
- Poster: R.Belmont

- Inverse of B2 is increasing with Npart, i.e. expanding source size similar to /K HBT results

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Flow

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Flow

- azimuthal anisotropy,
- pressure gradient from initial spatial asymmetry or eccentricity
- second moment of Fourier coefficient, v2, shows good agreement with hydrodynamical models of low viscosity fluid

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## v2 - constituent quark flow - QM06

- v2 - constituent quark flow

- observed quark DOF scaling up to KET/nq ~ 1GeV/c2 for p,K,p,d,

- S.Huang, Session XII, 02/08 15:20h, Poster by A.Taranenko

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## v4 - scales with v2

- V4

- pT (GeV/c)

- V4/(nq)2

- KET /nq (GeV/c2)

- KET (GeV/c2)

- S.Huang, Session XII, 02/08 15:20h, Poster by A.Taranenko

- v2  scales with nq,    v4  with nq2  partonic degree of freedom

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Cumulants - unidentified

- v2{2} > v2{RP} at pT ~3.5GeV/c indicates onset of non-flow effects

- M.Issah, Session XII, 02/08 14:40h

- cumulant method
- Borghini, Dinh and Ollitrault (Phys.Rev.C 64 054901 (2001))

- V2

- V2

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## v2 - identified particles @ high pT

- v2 - identified particles @ high pT

- S.Huang, Session XII, 02/08 15:20h

- V2

- pT (GeV/c)

- V2

- V2

- pions

- pT (GeV/c)

- pT (GeV/c)

- TOF-W allows test of KET/nq scaling

- kaons

- protons

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## v2 - identified particles @ high pT

- v2 - identified particles @ high pT

- V2

- V2

- + + - + 0

- pT (GeV/c)

- pT (GeV/c)

- S.Huang, Session XII, 02/08 15:20h

- + + - + 0

- charged and neutral pions agree well

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## v2 - high pT - rescaled 

- S.Huang, Session XII, 02/08 15:20h

- KET scaling seems breaks  for KET/nq > 1GeV/c2 = pT ~ 3.5GeV/c for p
- change in underlying process, hard scattering ?

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## v2 - J/e+e-

- v2 - J/e+e-

- First ever at RHIC,
- v2 - J/μ+μ- coming soon

- C.Silvestre, Session XVII, 02/09 15:00h, Poster: C.Luiz da Silva

- J/Psi coalescence ?

- in process, less than half the dataset, muons will help
- no clear model predictions

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## 2 Particle
Correlations

- 2 Particle
- Correlations

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## 2 particle angular correlations

- trigger

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## jet parameters

- study how medium is affected on the away side

- study jet peak widths and position

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## away side - shape and widths

- With increasing Npart the away side jets broaden and move away from each other but flat over most of Npart

- h - h correlations
- 1 < pTa < 2.5 < pTt< 4GeV/c

- M.McCumber, Session VIII, 02/05 16:30h
- A. Adare, Session IX, 02/08 14:20h

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Jet composition

- M.McCumber, Session VIII, 02/05 16:30h

- particle ratios in jet approach measured inclusive p/(+K) ratios.
- high pT particles in peripheral collisions close in on vacuum fragmentation

- h - b(m) correlations
- 1 < pTa < 2.5 < pTt< 4GeV/c

- AS Shoulder study: Jet Medium response -> properties of bulk

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Ridge and Shoulder pT

- Ridge and shoulder pT softer than pp
- no jet fragmentation
- slope close to bulk matter

- head and shoulder show similar behavior consistent with medium response

- M.McCumber, Session VIII, 02/05 16:30h, H.Pei, Session IX, 02/08 14:20h

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## 2+1 -h correlations

- H.Pei, Session IX, 02/08 14:20h

- trigger on high momentum 0, require a charged hadron in the back hemisphere of the 0 and integrate the yield of hadrons on the 0 side.

- yield increases with decreasing centrality for pTcond < 4GeV/c and is flat for > 4GeV/c

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Geometry

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Jets vs Reaction Plane

- M.McCumber, Session VIII, 02/05 16:30h

- in central collisions indication of  a change in the shape of the correlation function when moving away from the Reaction Plane

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## h-h correlations - jet functions

- M.McCumber, Session VIII, 02/05 16:30h

- unchanged near-side peak in the final jet functions when moving away from Reaction plane, indication for away side modification.

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008

## Summary

- mT scaling
- v2 baryon/meson scaling broken
- Coalescence in J/Psi
-  Medium response to jets

- A.Franz, BNL, PHENIX Highlights - QM08 Jaipur India, 04-10 February 2008