PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory...
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Transcript of PHENIX @ RHIC R.K. CHOUDHURY BARC. Relativistic Heavy Ion Collider at Brookhaven National Laboratory...
![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.](https://reader033.fdocuments.us/reader033/viewer/2022051115/56649e415503460f94b32d75/html5/thumbnails/1.jpg)
PHENIX @ RHIC
R.K. CHOUDHURY
BARC
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Relativistic Heavy Ion Collider at
Brookhaven National Laboratory (BNL), USA
World’s First Heavy Ion Collider became operational in 2000
PHENIX, STAR, PHOBOS & BRAHMS
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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
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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.
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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 ?
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Off Line Analysis BeginsOff Line Analysis Begins
Pattern RecognitionPattern Recognition
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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
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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
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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
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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.](https://reader033.fdocuments.us/reader033/viewer/2022051115/56649e415503460f94b32d75/html5/thumbnails/22.jpg)
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
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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.
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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
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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
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THANK YOU
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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.](https://reader033.fdocuments.us/reader033/viewer/2022051115/56649e415503460f94b32d75/html5/thumbnails/37.jpg)
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.](https://reader033.fdocuments.us/reader033/viewer/2022051115/56649e415503460f94b32d75/html5/thumbnails/38.jpg)
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.](https://reader033.fdocuments.us/reader033/viewer/2022051115/56649e415503460f94b32d75/html5/thumbnails/39.jpg)
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.](https://reader033.fdocuments.us/reader033/viewer/2022051115/56649e415503460f94b32d75/html5/thumbnails/40.jpg)
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.](https://reader033.fdocuments.us/reader033/viewer/2022051115/56649e415503460f94b32d75/html5/thumbnails/41.jpg)
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.](https://reader033.fdocuments.us/reader033/viewer/2022051115/56649e415503460f94b32d75/html5/thumbnails/42.jpg)
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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.
This talk: only non-central collisions.
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Elliptic Flow & Hydro. Calcs.