PHENIX Highlights II Photons, Hadronization and Thermalization
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Transcript of PHENIX Highlights II Photons, Hadronization and Thermalization
Quark Matter 2006 - Shanghai, China - Slide 1
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
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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
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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
The past week on nucl-ex …
Nov. 9
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Exploring Partonic Matter with High Luminosity in PHENIX
2006Hadron Blind Detector low mass di-electronsReaction Plane Detector improved reaction plane eg. v2(γ)
TOF-West hadron anomalyForward EMC (MPC) low x, initial state
2006- 2009Silicon Vertex Tracker heavy quark physics, jetsMuon trigger heavy flavor trigger
2008 – 2011Forward Vertex Tracker heavy quark physics, jetsNosecone 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
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The PHENIX Collaboration
QM 2006 20 talks 45 posters
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Run 4 ∫Ldt Extends Direct PhotonsDirect Photon Spectra vs Centrality
extend to high pT
1 < pT < 20 GeVMin. Bias
0-10%
08-92%high pT
Tadaaki Isobe Sun 2:00pm
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Direct RAA at 200 GeV
Direct g RAA with measured p+p reference data
η π0
Tadaaki Isobe Sun 2:00pm
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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.
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Low 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
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Photons
o Extended range to high and low pT
o Previous low pT analysis confirmed
o Started jet-photon correlations
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Flow for Light Hadrons is “Perfect”
TT KEp v2 scales with thetransverse kineticenergy!
Arkadij Taranenko Sun 2:20 pm
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Flow: Light Quarks → Strange → Charm
• Scaling flow para- meters by quark content nq resolves meson-baryon sepa- ration of final state hadrons
baryonsbaryons
mesonsmesons
Arkadij Taranenko Sun 2:20 pm
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mesons vs baryons flow scales with nq
Flow: Light Quarks → Strange → Charm
Arkadij Taranenko Sun 2:20 pm
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(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
Flow: Light Quarks → Strange → Charm
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Flowo 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 ?
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Di-Leptons in the Intermediate Region (IMR)
IMR
cc ee
• data
Sarah Campbell, Sun 5:20pm
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PHENIX Preliminary
Di-lepton pairs: Centrality Dependence
0-10% -- central 60-100% -- peripheral
PHENIX Preliminary
Sarah Campbell, Sun 5:20pm
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Nuclear Modification in Charm
New to Quark Matter 2006
Sarah Campbell, Sun 5:20pm
• 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
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Nuclear 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
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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
hadr
oni
cle
pton
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
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Di-Leptons
o First centrality dependence available
o Charm suppression in this channel
o Omega and Phi spectra
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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
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Medium Properties: Source Size
• Pion radii scale w/ mult. across system/energy• Consistent with freeze-out scenario
Poster: Akitomo Enokizono
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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.
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p/- p/+ ratios vs sNN, centralTatsuya Chujo, Sat 3:00 pm
Ratios constant in ppp/- increases in AA vs √s p/+ decreases in AA
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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
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0 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
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ConclusionsDirect 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