Quark Matter 2006 - Shanghai, China - Slide 1 PHENIX Highlights II Photons, Hadronization and...

Quark Matter 2006 - Shanghai, China - Slide 1

PHENIX Highlights IIPhotons, Hadronization and Thermalization

PHENIX Highlights IIPhotons, Hadronization and Thermalization

Matthias Grosse Perdekamp – UIUC and RBRCfor the PHENIX Collaboration

I: Propagation of Partons in a Colored Medium

John Lajoie, Iowa State University

II: Photons, Hadronization and Thermalization

Photons Thermalization Di-Leptons The Baryon Anomaly


From Budapest to Shanghai Partonic Matter: PHENIX Evidence Published

(1) Centrality dependence of direct photon production in √s = 200 GeV Au + Au collisions Phys.Rev.Lett.94:232301,2005

(2) Modifications to di-jet hadron pair correlations in Au+Au collisions at √s = 200 GeV Phys.Rev.Lett.97:052301,2006

(3) J/psi production and nuclear effects for d+Au and p+p collisions at √sNN = 200 GeV Phys.Rev.Lett.96:012304,2006

(4) Single electrons from heavy flavor decays in p+p collisions at √s = 200-GeV Phys.Rev.Lett.96:032001,2006

(5) Measurement of identified π0 and inclusive photon v2 and implication to the direct photon production in √sNN = 200-GeV Au+Au collisions.

Phys.Rev.Lett.96:032302,2006 (6) Jet structure from di-hadron correlations in d+Au collisions at √sNN = 200-GeV Phys.Rev.C73:054903,2006. (7) Nuclear modification of electron spectra and implications for heavy quark energy loss in Au+Au collisions at √sNN = 200 GeV Phys.Rev.Lett.96:032301,2006(8) Common suppression pattern of eta and π0 mesons at high transverse momentum in Au+Au collisions at √SNN = 200 GeV

Phys.Rev.Lett.96:202301,2006• Nuclear effects on hadron production in d+Au and p+p collisions at √sNN = 200 GeV Phys.Rev.C74:024904,2006 (10) Azimuthal angle correlations for rapidity separated hadron pairs in d + Au Collisions at √sNN = 200-GeV

Phys.Rev.Lett.96:222301,2006 (11) Jet properties from di-hadron correlations in p+p collisions at √s = 200 GeV

Phys.Rev.D74:072002,2006


Quark Matter 2006: Exploring the matter New PHENIX Results (1) Measurement of direct photon production in p + p collisions at √s = 200 GeV. hep-ex/0609031 (2) Measurement of single muons at forward rapidity in p+p collisions at √s = 200-GeV and implications for charm production.

hep-ex/0609032

(3) High transverse momentum eta meson production in p+p, d+Au and Au+Au collisions at √sNN = 200 GeV nucl-ex/0611006 (4) A detailed study of high-pT neutral pion suppression and azimuthal anisotropy in Au+Au collisions at √sNN = 200 GeV nucl-ex/0611007 (5) Energy loss and flow of heavy quarks in Au+Au collisions at √sNN = 200 GeV nucl-ex/0611018 (6) J/psi production in p+p collisions at √s = 200 GeV nucl-ex/0611020 (7) System size and energy dependence of jet induced hadron pair correlation shapes in Cu-Cu and Au-Au collisions at √sNN = 200 GeV nucl-ex/0611019 (8) J/psi production in Au+Au collisions at √s = 200 GeV nucl-ex/0611020 (9) Pair production of protons and anti-protons in Au+Au Collisions at √sNN = 200 GeV nucl-ex/0611016

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Exploring Partonic Matter with High Luminosity in PHENIX

Exploring Partonic Matter with High Luminosity in PHENIX

2006

Hadron Blind Detector low mass di-electrons

Reaction Plane Detector improved reaction plane eg. v2(γ)

TOF-West hadron anomaly

Forward EMC (MPC) low x, initial state

2006- 2009

Silicon Vertex Tracker heavy quark physics, jets

Muon trigger heavy flavor trigger

2008 – 2011

Forward Vertex Tracker heavy quark physics, jets

Nosecone Calorimeter jets, γ-jet, heavy quark physics

RHIC II 10 x Luminosity

complete

funded

PHENIXupgrades

Driven by growing interest:

Year --- Institutions --- Participants

2001 53 420 2003 57 460 2006 68 550


The PHENIX CollaborationThe PHENIX Collaboration

QM 2006 20 talks 45 posters


Run 4 ∫Ldt Extends Direct PhotonsRun 4 ∫Ldt Extends Direct Photons

Direct Photon Spectra vs Centrality

extend to high pT

1 < pT < 20 GeV

Min. Bias0-10%

08-92%high pT

Tadaaki Isobe Sun 2:00pm


Direct RAA at 200 GeVDirect RAA at 200 GeV

Direct g RAA with measured

p+p reference data

η π0

Tadaaki Isobe Sun 2:00pm


Direct Photons at Low pT

QM 2005: Data consistent with thermal+ NLO pQCD

pQCD uncertain at low pT

Gordon and Vogelsang Phys. Rev. D48, 3136 (1993)

Thermal d’Enterria, Perresounko Eur.Phys.J.C46:451-464,2006

(a) New experimental method for the measurement of direct photons

external conversion from beam pipe

(b) p-p and d-Au reference data: work in progress.


Low pT new conversion methodLow pT new conversion methodDmitri Peressounko, Sat 5:20pm

Direct Photons, Au+Au at 200 GeV

External conversions

Internal Conversions

o New measurement with

external conversions

o Improved systematics

o Agreement with

previous results


PhotonsPhotons

o Extended range to high and low pT

o Previous low pT analysis confirmed

o Started jet-photon correlations


Flow for Light Hadrons is “Perfect”Flow for Light Hadrons is “Perfect”

TT KEp v2 scales with thetransverse kineticenergy!

Arkadij Taranenko Sun 2:20 pm


Flow: Light Quarks → Strange → Charm


• Scaling flow para- meters by quark

content nq resolves meson-baryon sepa- ration of final state hadrons

baryonsbaryons

mesonsmesons



mesons vs baryons flow scales with nq





(1) Consistent with c-quark thermalization (2) large cross section is needed in AMPT ~10 mb (3) Resonance state of D & B in sQGP

indicates quark level thermalization & strong coupling

[PRC72,024906][PRC73,034913]

[Phys.Lett. B595 202-208 ]

Shingo Sakai Sat 5:20pm




FlowFlow

o Scaling properties consistent with ideal fluid hydrodynamics

o Consistent with quark level thermalization and strong coupling

o Observe flow for light, strange, and charm quarks

q What else can we do with charm ?


Di-Leptons in the Intermediate Region (IMR)Di-Leptons in the Intermediate Region (IMR)

IMR

cc ee

• data

Sarah Campbell, Sun 5:20pm


PHENIX Preliminary

Di-lepton pairs: Centrality Dependence Di-lepton pairs: Centrality Dependence

0-10% -- central 60-100% -- peripheral

PHENIX Preliminary


http://www.phenix.bnl.gov/

http://www.phenix.bnl.gov/


Nuclear Modification in CharmNuclear Modification in Charm

New to Quark Matter 2006


• Dielectron: RCP in Charm Region

1.4< mee < 2.8 GeV/c2

• Single Electron: RAA

at low and high pT

• Similar charm suppression patterns

RCP for 1.4 < mee < 2.8 GeV/c2, Au-Au


Nuclear Modification in CharmNuclear Modification in Charm

• Dielectron: RCP in Charm Region1.4<mee < 2.8 GeV/c2

• J/Psi: RAA

• Similar charm suppression patterns

New to Quark Matter 2006

PHENIX preliminary

Sarah Campbell, Sun 5:20pm RCP for 1.4 < mee < 2.8 GeV/c2, Au-Au


ω e+e-, π0π+π- ,π0γ in pp, dAu and AuAup+p Au+Aud+Au

ω e+e- Au+Au √sNN=200 GeVρ,ω, e+e- p+p √s=200 GeV

had

ron

ic

lep

ton

ic

PHENIX Preliminary

Yuriy Riabov, Sun 2:20pm

0+- (0) p+p √s =200 GeV d+Au √sNN =200 GeV 0 Au+Au √sNN=200 GeV

PHENIX mapped out high pT ω in p+p, d+Au & produced a first result in Au+Au ω, e+e- in p+p are not ready yet, but the signal there is very clean


Di-LeptonsDi-Leptons

o First centrality dependence available

o Charm suppression in this channel

o Omega and Phi spectra


Multiplicity Fluctuation: Universal ScalingAll points are scaled to match the 200 GeV Au+Au data curve to illustrate the scaling.

0.2<pT<2.0 GeV/c

0.2<pT<0.75 GeV/c

s2/m2 α Npart-1.40±0.03

Jeff Mitchell, Sun 5:00pm


Medium Properties: Source SizeMedium Properties: Source Size

• Pion radii scale w/ mult. across system/energy• Consistent with freeze-out scenario

Poster: Akitomo Enokizono


Masahiro Konno, Sun 2:20 pmIncreased ∫Ldt and PID

p/ vs centrality, Au+Au, √s = 200 GeV

p/ p/

- p/ (pbar/) ratios seem to turn over at intermediate pT, and close to the value of fragmentation at higher pT.- Consitent with expectations from recombination- Indicating transition from soft to hard at intermediate pT.


p/- p/+ ratios vs sNN, centralp/- p/+ ratios vs sNN, centralTatsuya Chujo, Sat 3:00 pm

Ratios constant in ppp/- increases in AA vs √s p/+ decreases in AA


p & p Near Side CorrelationsBaryon Associated with p-p pairs

p & p Near Side CorrelationsBaryon Associated with p-p pairs

_

_

opposite sign pairs:CORRELATED

cGeVtrigpassocp TT / 0.4.)(5.2.)(8.1

same sign pairs:NO CORRELATION

Anne Sickles, Wed. 4:00 pm


0 RAA in Cu+Cu at different √sNN0 RAA in Cu+Cu at different √sNN

Comparison of 0 inCu+Cu for 22, 62, 200 GeV

Suppression increaseswith energy

RHIC

High luminosity +flexibility to vary collisions systems + energies

Baldo Sahlmueller, Sun 2:00pm


ConclusionsConclusionsDirect Photons Extended range to high and low pT

Previous low pT analysis confirmed

Started Jet photon correlations

Flow Observed flow for light, strange, and charm quarks

Observed scaling properties consistent with ideal fluid hydrodynamics Di-Leptons First centrality dependence available

Charm suppression in this channel ? Baryon anomaly Baryon/meson studies extended to hard region, ratio returns to vacuum expectation

PHENIX is well positioned to explore the sQGP withhigh luminosity and improved detector capabilities

Quark Matter 2006 - Shanghai, China - Slide 1 PHENIX Highlights II Photons, Hadronization and...

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