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20th International Conference on Nucleus Nucleus Collisions

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1 20th International Conference on Nucleus Nucleus Collisions
High pT direct photon spectra and azimuthal anisotropy measurements in 200GeV Au+Au collisions at RHIC-PHENIX Quark-Matter 2008 20th International Conference on Nucleus Nucleus Collisions Kentaro MIKI (Univ. of Tsukuba) for the PHENIX collaboration mail to: 02/08/2008

2 1-1. Introduction ~Photons~
Photons are emitted from several stage of heavy ion collisions! sQGP Thermal Hadron decay Jet fragmentation Hard scattered Jet Brems. 02 / 08 / 2008 QM Kentaro Miki - 1

3 1-1. Introduction ~Photons~
Photons are emitted from several stage of heavy ion collisions! sQGP Thermal Hadron decay Jet fragmentation Hard scattered Jet Brems. Direct photons are not suppressed in Au+Au collisions. 02 / 08 / 2008 QM Kentaro Miki - 1

4 1-2. Introduction ~direct photon~
Direct photon is penetrating probe for initial hot and dense matter. There are many photon sources in heavy ion collisions. All NLO-pQCD QGP-Thermal Jet-photon Phys. Rev., C69:014903(2004) QM 2006 thermal window -> 1~3 GeV/c (?) prompt photon -> 6~ GeV/c (?) High pT direct photons are produced in the initial stage. Thermal radiation are emitted in the low pT region. 02 / 08 / 2008 QM Kentaro Miki - 2

5 1-3. Introduction ~v2~ The collision participation part in the early stage has spatial anisotropy. Pressure gradient is the largest in the shortest direction of the ellipsoid. Emitted particles reflect initial spatial anisotropy. -Elliptic flow (v2) is defined by the 2nd coefficient of Fourier expansion > S. Huang, (Parallel talk XII)  : azimuthal angle of particles  : azimuthal angle of reaction plane 02 / 08 / 2008 QM Kentaro Miki - 3

6 2-1. PHENIX experiment lead scintillator (PbSc) ・energy resolution
2.1  8.1 %/ E1/2 [GeV] || < =902 lead glass (PbGl) ・energy resolution 0.76  5.95 %/ E1/2 [GeV] 02 / 08 / 2008 QM Kentaro Miki - 4

7 3-1. Analysis method Inclusive photon 0   ’ Direct 
hadron decay　 Inclusive photon ex. 0 invariant mass distribution 3.0 < pT < 4.0 0 ’ 02 / 08 / 2008 QM Kentaro Miki - 5

8 3-1. Analysis method Inclusive photon Direct  hadron decay  5
02 / 08 / 2008 QM Kentaro Miki - 5

9 3-2. Direct photon analysis ~spectra~
200 GeV Run4 direct photon pT spectra (900M events) Reached up to 18GeV/c Direct photon spectra well described by NLO pQCD calculations. QM2006 proceeding T. Isobe 02 / 08 / 2008 QM Kentaro Miki - 6

10 3-2. Direct photon analysis ~spectra~
200 GeV Au+Au: Direct  RAA is equal to 1 below 14GeV/c. (no suppress/enhance) Direct  RAA is less than 1 above 14GeV/c. ( Isospin effect? EMC effect? Suppression of fragmentation photons? ) RAA with pQCD RAA with p+p data K. Reygers (parallel session I) 02 / 08 / 2008 QM Kentaro Miki - 6

11 3-2. Direct photon analysis ~spectra~
200 GeV Cu+Cu: Direct  RAA equal to 1 up to pT 17 GeV/c. Direct photon RAA in Cu+Cu supports simple TAB scaling of hard scattering up to highest pT Cu+Cu RAA with pQCD RAA with p+p data K. Reygers (parallel session I) 02 / 08 / 2008 QM Kentaro Miki - 6

12 3-3. Direct photon analysis ~spectra~
62.4 GeV Run4 Au+Au 62.4 GeV direct photon spectra Direct photon at 62.4 GeV is also well described by NLO pQCD calculation above 5 GeV/c. sNN = 62.4 GeV, Au + Au 02 / 08 / 2008 QM Kentaro Miki - 7

13 4-1. Direct photon analysis ~v2~
Hadron decay　 Inclusive photon hard scatter Jet Brems. Jet Fragment sQGP The v2 is sensitive to the initial geometric overlap zone and pressure gradient. Therefore, direct photon v2 is considered to depend on the production processes of photons. 02 / 08 / 2008 QM Kentaro Miki - 8

14 4-1. Direct photon analysis ~v2~
Hadron decay　 Inclusive photon hard scatter Jet Brems. Jet Fragment sQQP hard scatter Jet Brems. Jet Fragment sQGP v2 = 0 v2 < 0 v2 > 0 v2 ≥ 0 photons from jet annihilation compton scattering v2 > 0 Bremsstrahlung (energy loss) v2 < 0 02 / 08 / 2008 QM Kentaro Miki - 8

15 4-2. Run4 Result Direct photon v2 at 200GeV Au+Au (Run4)
Above to 4GeV/c, equal to 0 ? In 3 to 4 GeV/c region is Non-zero v2 ?? Centrality dependence ??? 02 / 08 / 2008 QM Kentaro Miki - 9

16 4-3. Compared with predictions
Rupa et al calculation Hydrodynamics with a thermalization at early times followed by hadronization and decoupling. PRL 96, (2006) > R. Chatterjee (poster 80) 02 / 08 / 2008 QM Kentaro Miki - 10

17 4-3. Compared with predictions
Rupa et al calculation Tuibide et al calculation Hydrodynamic with a thermalization at early times followed by hadronization and decoupling. 2D+1 hydrodynamical model. Several different sources are considered. PRL 96, (2006) arXiv: v2 > R. Chatterjee (poster 80) consistent to theoretical calculation … ? 02 / 08 / 2008 QM Kentaro Miki - 10

18 5-1. How to update? > Direct photon v2 in Run4 has large error bar
02 / 08 / 2008 QM Kentaro Miki - 11

19 5-1. How to update? > Direct photon v2 in Run4 has large error bar
> Low pT region -- thermal photon from virtual gamma analysis > T. Dahms, (parallel talk XV) 02 / 08 / 2008 QM Kentaro Miki - 11

20 5-1. How to update? > Direct photon v2 in Run4 has large error bar
> Low pT region -- thermal photon from virtual gamma analysis > T. Dahms, (parallel talk XV) > High pT region -- more statistics! -- Run 7 analysis -- improvement of event plane resolution! -- New detector 02 / 08 / 2008 QM Kentaro Miki - 11

21 5-2. Reaction plane detector (RXNP)
Run7 has new detector for reaction plane definition. RXNP has twice better resolution than BBC. > Y. Ikeda, (poster 123) 02 / 08 / 2008 QM Kentaro Miki - 12

22 5-3. 0 v2 Run7 with RXNP 1.8 B events collected.
Good agreement with Run4 Preliminary. Good accuracy up to 10 GeV/c. More data to analyze => up to 13 or 16 GeV/c > R. Wei, (poster 128) > Y. Aramaki, (poster 143) 02 / 08 / 2008 QM Kentaro Miki - 13

23 5-4. compared with … … with inclusive photon v2 (Run 4) 14
We can see the same (or less) statistical uncertainty even inclusive photon. Run7 allows us more detail comparison between hadron decay photon and inclusive photon. 02 / 08 / 2008 QM Kentaro Miki - 14

24 5-4. compared with … … with inclusive photon v2 (Run 4)
… with charged hadron v2 (Run 7) We can see the same (or less) statistical uncertainty even inclusive photon. Run7 allows us more detail comparison between hadron decay photon and inclusive photon. Good agreement to charged pion v2. > S. Huang, (parallel talk XII) 02 / 08 / 2008 QM Kentaro Miki - 14

25 6. Summary 1. Direct photon is one of the interesting measurement
as penetrating probe for initial hot and dense matter. 2. The photon excess ratio is measured in 200 GeV and 62.4 GeV. 3. The invariant yield is well described by NLO pQCD. 4. Direct photon v2 is measured in Run4, with large error bar. => consistent with theoretical prediction in high pT. 5. Run7 0 v2 is measured as a function of pT. => Run7 allows us more detail direct photon study at high pT in a near future. 6. Thank you for all collaborators! 02 / 08 / 2008 QM Kentaro Miki - 15

26 Ex Back up 02 / 08 / 2008 QM Kentaro Miki -

27 Ex. In the 2~4 GeV/c region, 1. Enhancement of direct photon in Au+Au
2. Direct photon v2 might be non-zero => There is other components ?? 02 / 08 / 2008 QM Kentaro Miki -

28 Ex. Decay photon and inc. photon (run 4)
0 v2 as EXODUS input 0 v2 from latest Dave’s analysis. In order to define the EXODUS input, fitting 1 function below 4GeV/c and fitting point to point above 4GeV/c. decay photon and inc. photon v2 Generated decay photon v2 by Monte Carlo. Error bar is propagated from 0 sta. and sys. error to decay photon as sys. error. In this plot, assumed the KET scaling for , ,  and ’. 02 / 08 / 2008 QM Kentaro Miki -

29 Ex. pi0 v2 in Run4 02 / 08 / 2008 QM Kentaro Miki -

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