PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory...

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Page 1: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

PHENIX @ RHIC

R.K. CHOUDHURY

BARC

Page 2: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Relativistic Heavy Ion Collider at

Brookhaven National Laboratory (BNL), USA

World’s First Heavy Ion Collider became operational in 2000

PHENIX, STAR, PHOBOS & BRAHMS

Page 3: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Relativistic Heavy Ion Collider @ BNL

Facts about RHIC

Tunnel: 3.66 m wide under the ground Circumference: 3.84 km Au Beam @200GeV/n speed: 99.995 % of c 1000’s of collisions per second 1000’s of particles produced per collision T ~ 1012 K >> T (centre of the sun) 107 K Spin polarized proton beam upto 500GeV/n

Page 4: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

PHENIX: Pioneering High Energy Nuclear Interaction eXperiment. PHENIX is designed specifically to measure direct probes of the

collisions such as electrons, muons, phtons and hadrons.

Page 5: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

12 Countries, 58 Institutions, 480 participants: Country: Brazil, China, France, Germany, Hungary, India, Israel,

Japan, Korea Russia, Sweden, USA

International Aspect of PHENIXInternational Aspect of PHENIX

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PRIMARY MOTIVATION(Physics Driven)

1. Study of Quark Gluon Plasma(To create a mini universe in the

laboratory what might have existed a few micro seconds after the big

bang)

2. To understand the origin of

Proton Spin

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To map out the QCD phase diagram

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What happens when two Au ions collide heads on ?What happens when two Au ions collide heads on ?

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What happens inside a Detector ?What happens inside a Detector ?

Page 12: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Off Line Analysis BeginsOff Line Analysis Begins

Pattern RecognitionPattern Recognition

Page 13: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

BARC CONTRIBUTION

Fabrication of Muon Tracking Stations

Simulation and Reconstruction Software

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PHENIX RUN STATISTICS

Run 01 2000 Au+Au @ 65 GeV/n for 5 weeks Run 02 2001 Au+Au @ 100 GeV/n for 16

weeks Run 03 2003 d+Au @ 100 GeV/n for 10

weeks Run 04 2004 Au+Au @ 100 GeV/n for 12

weeks Run 05 2005 Cu+Cu @ 100 GeV/n for 8 weeks Pol. p+p @ 100 GeV/n for 9 weeksRun 06 pol. p+p at 100 GeV/n for 14 weeks

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Results from PHENIX (HI runs)

-- Charged particle Multiplicities (stopping) -- Transverse Energy ( ~ 5 GeV/fm3) -- Particle Yield Ratios, energy spectra (thermalisation)

-- Elliptic Flow (v2 scales with eccentricity: high collectivity)

-- Two particle correlations -- Non-statistical Fluctuations -- Suppression of particle production at high pT

-- Jet suppression -- Heavy flavour production (open charm,J/psi) -- Large (anti)baryon to pion ratio at intermediate

pT

Page 17: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

1. Heavy flavour cross section:

-->Calculable with QCD also include effects such as Shadowing

-->Measure the cross section in pp, pPb and then extrapolate to Pb-Pb

2. Cold matter effects:

--> Nuclear absorption and Comover scattering, e.g.

J/psi + N --> D + D bar+ X

3. Energy loss in the medium:

4. Quarkonium suppression in QGP:

When screening radius rD < rQQbar, at T > TD

5. Quarkonium Enhancement at LHC:

No. of Q Qbar pairs produced at LHC is large. Possibility of recombination

Heavy Flavour Physics

Page 18: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

PHENIX - J/ Suppresion system size dependence

CuCu

200 GeV/c

AuAu

200 GeV/c

dAu

200 GeV/c

AuAuee

200 GeV/c

CuCu

62 GeV/c

J/ muon arm

1.2 < |y| < 2.2

J/ eeCentral arm

-0.35 < y < 0.35

Factor ~3suppression

in central events

CuCuee

200 GeV/c

Page 19: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

PHENIX - J/ Suppresion comparison to theory

Models that were successful in describing SPS datafail to describe data at RHIC

- too much suppression -

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PHENIX - J/ Suppresion comparison to theory

Implementing regeneration: much better agreement with the data

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Suppressed high pSuppressed high pTT hadroproduction in hadroproduction in

Au+Au Au+Au Au+Au 0 X (peripheral) Au+Au 0 X

(central)

Peripheral data agree well with Strong suppression in

p+p (data & pQCD) plus Ncoll-scaling central Au+Au collisions

Page 22: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Suppressed high pSuppressed high pTT hadroproduction hadroproduction

Discovery ofhigh p

T

suppression(one of most significant

results @ RHIC so far)

Ncoll

scaling

(“hard” production)

x5 suppression

Npart

scaling (surface emission)

RAA

<< 1: well below pQCD (collinear factorization) expectations for

hard scattering cross-sections

ppN

AuAuR

binaryAA

Page 23: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Evidence in Favor of QGPJet Tomography

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Jet Quenching Data

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A Strong Collective Behavior: FLOW

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Definition of flow?

Φ: azimuthal angle relative to reaction plane.f (Φ): azimuthal distribution of particles.Make Fourier expansion of f (Φ).1st Fourier coefficient v1 = directed flow2nd Fourier coefficient v2 = elliptic flow vn = <cos (nΦ)>, n = 1,2,…

Central collision: vn=0, n = 1,2,… But one can have a radial flow.

Elliptic Flow for only non-central collisions.

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Elliptic Flow & Hydro. Calcs.

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Has PHENIX found the Quark Gluon Plasma ?

It is too early to say for sure, but the observation of jet suppression, indication of a very strong amount of flow etc. are very promising.

The collected observations of all of the four RHIC experiments are consistent with a state of matter that has the properties of a perfect fluid comprised of quarks and gluons. fluid comprised of quarks and gluons.

Page 31: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Future Upgrades at RHIC

RHIC Upgrade: Electron beam cooling x10 Luminosity, longer store time

PHENIX Upgrade: Si Vertex Tracking Nose Cone Calorimeter High pT Aerogel Cerenkov Detector

Page 32: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Large Hadron Collider

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CMS Detector

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Scanned picture of BEL and CEERI Scanned picture of BEL and CEERI Detectors ( Prototype)Detectors ( Prototype)

Detector Micromodule

Si Preshower detector in Endcap ECAL

Page 35: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

THANK YOU

Page 36: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

1. Heavy flavour cross section:

-->Calculable with QCD also include effects such as Shadowing

-->Measure the cross section in pp, pPb and then extrapolate to Pb-Pb

2. Cold matter effects:

--> Nuclear absorption and Comover scattering, e.g.

J/psi + N --> D + D bar+ X

3. Energy loss in the medium:

4. Quarkonium suppression in QGP:

When screening radius rD < rQQbar, at T > TD

5. Quarkonium Enhancement at LHC:

No. of Q Qbar pairs produced at LHC is large. Possibility of recombination

Heavy Flavour Physics

Page 37: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

PHENIX - J/ Suppresion system size dependence

CuCu

200 GeV/c

AuAu

200 GeV/c

dAu

200 GeV/c

AuAuee

200 GeV/c

CuCu

62 GeV/c

J/ muon arm

1.2 < |y| < 2.2

J/ eeCentral arm

-0.35 < y < 0.35

Factor ~3suppression

in central events

CuCuee

200 GeV/c

Page 38: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

PHENIX - J/ Suppresion comparison to theory

Models that were successful in describing SPS datafail to describe data at RHIC

- too much suppression -

Page 39: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

PHENIX - J/ Suppresion comparison to theory

Implementing regeneration: much better agreement with the data

Page 40: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Suppressed high pSuppressed high pTT hadroproduction in hadroproduction in

Au+Au Au+Au Au+Au 0 X (peripheral) Au+Au 0 X

(central)

Peripheral data agree well with Strong suppression in

p+p (data & pQCD) plus Ncoll-scaling central Au+Au collisions

Page 41: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Suppressed high pSuppressed high pTT hadroproduction hadroproduction

Discovery ofhigh p

T

suppression(one of most significant

results @ RHIC so far)

Ncoll

scaling

(“hard” production)

x5 suppression

Npart

scaling (surface emission)

RAA

<< 1: well below pQCD (collinear factorization) expectations for

hard scattering cross-sections

ppN

AuAuR

binaryAA

Page 42: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.
Page 43: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Definition of flow?Φ: azimuthal angle relative to reaction plane.f (Φ): azimuthal distribution of particles.Make Fourier expansion of f (Φ).1st Fourier coefficient v1 = directed flow2nd Fourier coefficient v2 = elliptic flow vn = <cos (nΦ)>, n = 1,2,…

Central collision: vn=0, n = 1,2,… But one can have a radial flow.

This talk: only non-central collisions.

Page 44: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.
Page 45: PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory (BNL), USA World’s First Heavy Ion Collider became.

Elliptic Flow & Hydro. Calcs.


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The hottest matter on earth: a look at the Relativistic Heavy Ion Collider.

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Schwerionenphysik am Relativistic Heavy-Ion Collider RHIC Markus D. Oldenburg Frühjahrstagung der Deutschen Physikalischen Gesellschaft Aachen, 13. März.

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Probing High-Temperature QCD Matter at the Relativistic Heavy-Ion Collider (RHIC) Saskia Mioduszewski 18 September 2008.

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