# Presentation: 508358

## Extraction of Jet Topology Using Three Particle Correlations

***Probes of High-Energy Nuclear Collisions, June 9 – 16,  2006***

**N. N. Ajitanand**
**for the                     Collaboration**

***Extraction of Jet Topology Using Three Particle Correlations***

## The matter is strongly 

- The matter is strongly
- Coupled & hydro-like

***Reasonable to expect***
*** ******strong jet modification by ***
***such a medium***

**High Energy Density  matter produced in 200 GeV Au + Au**

## Possible Modifications of Jet Topology

**Armesto,Salgado,Wiedemann**

**Possible Modifications of Jet Topology**

**Flow induced deflection **

**Mach Cone Formation**

** **
** ****nucl-th/0406018 Stoecker**
** **
** ****Hep-ph/0503158 Muller,Ruppert**

**J. Casalderrey-Solana, E.V. Shuryak,**
**and D. Teaney, arXiv hep-ph/0411315 (2004)**

**Cherenkov Cone Formation**

**A. Majumdar HP2006**

- N. N. Ajitanand HP2006

## 
Total Correlation =  Real Triplets / Fake Triplets

Real Triplets : Combinations of three particles in same event 
Fake Triplets : Combinations of three particles each from different event

Harmonic Correlations constructed using particles emitted with harmonic correlation with respect to Reaction Plane

Jet Correlation = Total Correlation – a0*(Harmonic Correlation)
“ao”  is adjusted till Jet Correlation surface goes to zero at its minimum (ZYAM  Ajitanand et.al. Phys. Rev. C 72, 011902 (2005) )

**Total Correlation =  ****Real Triplets / Fake Triplets**
**Real Triplets**** : Combinations of three particles in same event **
**Fake Triplets**** : Combinations of three particles each from different event**
**Harmonic Correlations**** constructed using particles emitted with harmonic correlation with respect to Reaction Plane**
**Jet Correlation = Total Correlation – a0*(Harmonic Correlation)**
**“****ao”  is adjusted till ****Jet Correlation surface**** goes to zero at its minimum (ZYAM  *****Ajitanand et.al. ******Phys. Rev. C 72, 011902 (2005)***** )**

**Three particle correlations used to extract jet topology **

- N. N. Ajitanand HP2006

## PHENIX acceptance limits angles between correlated triplets

- Medium angles

- Large angles

**H**

**Necessary to do Sim study of jet models to get a feel for expected correlation shapes **

- |eta|<0.35   phi_arm~90

## Cone Jet

- Normal Jet

- Deflected Jet

- N. N. Ajitanand HP2006

## Correlations Constructed in high pt Frame

**The high pT frame is the intuitive choice for the study of jet topology**

* *_*High pT (2.5<pT<4)*_
*p1*

*p2-a*

*p3-a*

**Correlation Variables** :

*Associated*_* pTs (1<pT<2.5)*_* *

##  Normal Jets in zero-flow background

-  **Normal Jets in zero-flow background**

**Standard 2-Particle Correlation**

**3-Particle  Correlation**
**Polar plot**
**along radius**
**   ****along azimuth**

- PHENIX SIM

## Cone

- Deflected

**2-particle Correlations made to be similar **** **

**3-Particle  Correlations**

- PHENIX SIM

-  **Abnormal Jets in zero flow background**

**excess**

**3p correlations different even if  2p correlations are similar**

## Cone

- Deflected

** ****Harmonic removed by ZYAM method**

- PHENIX SIM

**Abnormal Jets in flowing background**

** ****Full Correlation**

- Deflected

**ZYAM gives good Jet Recovery**

## Cone

- Deflected

**soft-soft & soft-hard processes only**

- PHENIX SIM

-  **Normal Jets in zero flow background**

**all processes **

**Excess due to hard-soft-soft correlations**

## 0-5 %

**PHENIX *****Preliminary***

- Data

**Indications of abnormal jets **

## 5-10 %

- 3-particle Full Correlation Function

**PHENIX Acceptance**

**PHENIX *****Preliminary***

- Data

- Jet landscape giving way to flow

- N. N. Ajitanand HP2006

## 10-20 %

- 3-particle Full Correlation Function

**PHENIX Acceptance**

**PHENIX *****Preliminary***

- Data

- Flow Dominated

- N. N. Ajitanand HP2006

## Flow Dominated

- 3-particle Full Correlation Function

**PHENIX Acceptance**

**PHENIX *****Preliminary***

- Data

- 20-40 %

- N. N. Ajitanand HP2006

## 40-60 %

- 3-particle Full Correlation Function

**PHENIX Acceptance**

**PHENIX *****Preliminary***

- Data

- Flow Dominated

- N. N. Ajitanand HP2006

## Normal jet dominated

- 3-particle Full Correlation Function

**PHENIX Acceptance**

**PHENIX *****Preliminary***

- Data

- 60-90 %

- N. N. Ajitanand HP2006

## PHENIX Preliminary

**PHENIX Acceptance**

**PHENIX *****Preliminary***

- Data

**Indication of abnormal jets  without harmonic removal**

## 20-40 %

**PHENIX *****Preliminary***

- Data

**Strong away side modification seen**

- N. N. Ajitanand HP2006

## Conclusions

**The high pt frame is a suitable choice  for the study of jet topology via three particle correlations**
**Polar plots of three particle correlations obtained for 200 GeV Au+Au**
**Correlation  for most central case shows abnormal topology even without harmonic removal**
**Harmonic subtracted correlation function for mid-central shows strong away side modification**
**Differentiation of deflection and cone topology will be evaluated after accounting for  soft-soft and hard-soft  contributions**
**Method may be a potential tool for jet study at LHC**
**Method could be useful for mid-forward eta correlation studies**
**(****F. Wang – HP2006****)   **