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Event anisotropy of identified p0, g and e compared to charged
p, K, p, and din sNN = 200 GeV Au+Au at PHENIXMasashi Kanetafor the
PHENIX collaboration
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USAAbilene Christian University, Abilene, TXBrookhaven National
Laboratory, Upton, NYUniversity of California - Riverside,
Riverside, CAUniversity of Colorado, Boulder, COColumbia
University, Nevis Laboratories, Irvington, NYFlorida State
University, Tallahassee, FLFlorida Technical University, Melbourne,
FLGeorgia State University, Atlanta, GAUniversity of Illinois
Urbana Champaign, Urbana-Champaign, ILIowa State University and
Ames Laboratory, Ames, IALos Alamos National Laboratory, Los
Alamos, NMLawrence Livermore National Laboratory, Livermore,
CaUniversity of New Mexico, Albuquerque, NMNew Mexico State
University, Las Cruces, NMDept. of Chemistry, Stony Brook Univ.,
Stony Brook, NYDept. Phys. and Astronomy, Stony Brook Univ., Stony
Brook, NY Oak Ridge National Laboratory, Oak Ridge, TNUniversity of
Tennessee, Knoxville, TNVanderbilt University, Nashville,
TNBrazilUniversity of So Paulo, So PauloChinaAcademia Sinica,
Taipei, TaiwanChina Institute of Atomic Energy, BeijingPeking
University, BeijingFranceLPC, University de Clermont-Ferrand,
Clermont-FerrandDapnia, CEA Saclay, Gif-sur-YvetteIPN-Orsay,
Universite Paris Sud, CNRS-IN2P3, OrsayLLR, Ecle Polytechnique,
CNRS-IN2P3, PalaiseauSUBATECH, Ecle des Mines at Nantes,
NantesGermanyUniversity of Mnster, MnsterHungaryCentral Research
Institute for Physics (KFKI), BudapestDebrecen University,
DebrecenEtvs Lornd University (ELTE), Budapest IndiaBanaras Hindu
University, BanarasBhabha Atomic Research Centre,
BombayIsraelWeizmann Institute, RehovotJapanCenter for Nuclear
Study, University of Tokyo, TokyoHiroshima University,
Higashi-HiroshimaKEK, Institute for High Energy Physics,
TsukubaKyoto University, KyotoNagasaki Institute of Applied
Science, NagasakiRIKEN, Institute for Physical and Chemical
Research, WakoRIKEN-BNL Research Center, Upton, NYRikkyo
University, TokyoTokyo Institute of Technology, TokyoUniversity of
Tsukuba, TsukubaWaseda University, Tokyo S. KoreaCyclotron
Application Laboratory, KAERI, SeoulKangnung National University,
KangnungKorea University, SeoulMyong Ji University, Yongin
CitySystem Electronics Laboratory, Seoul Nat. University,
SeoulYonsei University, SeoulRussiaInstitute of High Energy
Physics, ProtovinoJoint Institute for Nuclear Research,
DubnaKurchatov Institute, MoscowPNPI, St. Petersburg Nuclear
Physics Institute, St. PetersburgSt. Petersburg State Technical
University, St. PetersburgSwedenLund University, Lund 12 Countries;
58 Institutions; 480 Participants**as of January 2004
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AnnouncementThe flow and event anisotropy from the PHENIX
collaborators in the poster session* StudentsShingo Sakai*Azimuthal
anisotropy of electrons/positrons in 200 GeV Au+Au collisions at
RHIC-PHENIXAndrey Kazantsev*Elliptic flow of inclusive photons in
Au+Au collisions at sNN=200 GeV from the PHENIX experiment at
RHICHiroshi Masui*Measurement of directed flow in sNN=200 GeV
Au+Au, d+Au, p+p collisions at RHIC-PHENIXAkio KiyomichiRadial flow
study from identified hadron spectra in Au+Au collisions at sNN=200
GeV (at PHENIX)Michael Issah*Azimuthal anisotropy measurements in
PHENIX via cummulants of Multiparticle azimuthal
correlationsDebsankar MukhopadhyayElliptic flow of f mesons in
Au+Au collisions at sNN=200 GeV (at PHENIX)ShinIchi EsumiAnalysis
of event anisotropy and azimuthal pair correlation
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MotivationsEvent anisotropySensitive to the initial
stateCollectivity of hadron/parton thermalization /
recombinationEnergy loss by Jet quenching dense matter
p0Large pT coverage as an identified hadronLarge contribution of
the decay to the following inclusive measurementsPhotonRadiation /
Compton from hot gasPhoton flow?Electron/positronOpen charm and
bottomFlow and energy loss of heavy flavors?
- The PHENIX experiment at RHICPhotons/p0Tracking : vertex be BBC
to EMC hit positionsPID : EMCalEvent centralityBBC and
ZDCElectronsTrackingDC, PC hits, vertex by BBCPIDRICH (pT
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Method of v2 MeasurementDefine reaction plane by charged
multiplicity on Beam-Beam CountersPhotonsObtained the second
harmonic coefficient v2 from p0p0 reconstruction and background
subtract (combinatorial and the others)For each pT, azimuthal
angle, centralityCombine both informationCounting number of p0 as a
function of f-r and fit by the formula ElectronsBoth methods are
usedevent anisotropy parameter measuredazimuthal angle of the
particlereaction plane anglevnreal = vnmeasured/ (reaction plane
resolution)n Note: the detail of reaction plane definition will be
found in nucl-ex/0305013
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Reaction plane definition
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g & p0 v2
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Inclusive photon v2 and p0 v2 in 200 GeV Au+AuInclusive photon
v2 shows similar tendency with p0Need more statistics to see photon
v2 after p0 (and also h) decay effect subtractionvertical bar :
stat. errorcurves, gray box : sys. errorphenix preliminaryNote :
Inclusive photon = including all of the decay effect from hadrons
phenix preliminaryphenix preliminarypT [GeV/c], 200 GeV Au+Au, 200
GeV Au+Au, 200 GeV Au+Au
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p0 decay effect for photon v2 (MC)Tool is ready for the decay
effect in photons0 1 2 3 4 50.35
0.3
0.25
0.2
0.15
0.1
0.05
0
-0.05v20 1 2 3 4 5pT [GeV/c]p0 v2 for MC inputp0 v2 generatedg
v2 from p0 decayTest 1Test 2
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vs. centrality from 200 GeV Au+AuVertical bar : stat. errorGray
Box : sys. errorNpart26 46 74 114 167 235 325Npart26 46 74 114 167
235 325phenix preliminaryphenix preliminary200 GeV Au+Au200 GeV
Au+Au
- v2 vs. pT vs. centrality from 200 GeV Au+AuThe charged p and K
v2 are shown only with statistical errorsStatistical error is shown
by error barSystematic error from p0 count method and reaction
plane determination is shown by horizontal barThe data point stays
at in the bin and horizontal bar shows the bin rangeCharged meson
v2 consistent with p0 v2 in pT
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v2 vs. pT (Min. Bias) from 200 GeV Au+AuIdentified particle v2
up to pT=10 GeV/c}nucl-ex/0305013phenix preliminary200 GeV Au+Au
Min. Bias36.3106 [events] = 5.3 [(mb)-1]AlsoSimilar pT dependence
with charged hadron v2Low pT : consistent with hydrodynamical
calculationHigh pT : interesting to compare to a jet quenching
calculation/ fragmentation-recombination model0.50.4Consistent with
charged pionsVertical bar : stat. errorcurves, Gray Box : sys.
error
The data point :at in the bin
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v2 : Identified hadrons at mid-rapidityPHENIX p, K, pin
nucl-ex/0305013and they are consistent with STAR data
PHENIX p0, d+dpreliminary data
STAR K0S , L+Lin nucl-ex/0306007200 GeV Au+Au Min. Bias
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Coalescence pictureIt is established for the nuclei cross
section
A : nuclear numberP : momentump = P/ABA : coalescence
parameter
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Quark coalescence?Phys. Rev. Lett. 91 (2003) 092301, D. Molnar
and S.A. Voloshinqqmeson, qqq(qqq)Baryon
What data looks like?
----Non-strange and strange mesons and baryons seem to be merged
around pT/nquark 1-3 GeV/cWith more statistics, we may discuss
precisely
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e v2
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Non-photonic e v2Non-photonic electron (sorry for jargon)
meansMeasured electron minus background:hadron decayg
conversionthat is, charmed (+bottomed) electronwe thinkTwo
scenarios in nucl-th/0312100thermalized charm + transverse flowno
re-interactionData is consistent with both scenariosHave a look of
the poster for detail discussionShingo SakaiAzimuthal Anisotropy of
electrons/positrons in 200 GeV Au+Au Collisions at
RHIC-PHENIXTakashi HachiyaSingle Electrons From Semi-leptonic
Decays of Heavy Flavor in Au+Au Collisions at sNN=200 GeV
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Summary
- SummaryFirst measurement of p0, g, e v2 at RHICp0 v2Minimum
bias data (pT =1-10 GeV/c)v2 at the highest pT from the identified
particle analysisNon-zero p0 v2 up to pT ~8 GeV/cCharged p v2
consistent with p0 v2 in pT =1-3 GeV/cQuark coalescence picture
seems to work from combining various hadron v2s at RHICg
v2Centrality (top 20, 20-40, 40-60%) and pT dependence (in pT
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New results of charged hadron vnEllipticFlowDirectedFlowHave a
look of the poster for detail discussionHiroshi MasuiMeasurement of
directed flow in sNN=200 GeV Au+Au, d+Au, p+p collisions at
RHIC-PHENIX
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Backup
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Example plots from the p0 v2 analysis proceduresall histograms
are checked by eyes!!
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Tooooooooooooo many histograms checked
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v2 vs. pT (Minimum Bias) from 200GeV Au+Auphenix
preliminarynucl-ex/030501336.3106 [events] = 5.3+0.5-0.4
[(mb)-1]
- Comparison with a modelHydrodynamical calculation agreed in
pT~
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Comparison with a modelComparison with a model which is
described in nucl-th/0306027. Here we don't want to discuss which
model can describe the data. To conclude which model can describe
the data, we need much more statistics in high pT region.Special
thanks toC. Nonaka (one of authors)of nucl-th/0306027 fordata of
model calculation phenix preliminary
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Photon purity with cuts
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Systematic errorsdifferent methods for extracting v2different
reaction planes methodsdifferent colors for the sys. errors.
- Particle identificationsRequirement for photonDead and noisy
EMC towers are removed for the analysisPID cuts: c2
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Charmed electron v2
15 sec
Let me start event anisotropy talk from PHENIX about pi zero
gamma and electron in 200 GeV Gold on Gold collisions.
10 sec
This is the PHENIX collaboration from 12 countries, 58
institutions and 480 participants.20 sec
Before start of my talk, I want to mention PHENIX poster related
flow and event anisotropy.The names colored by red are students.It
is not too late to go to poster session to read it.Please go the
poster session and talk with those students, especially.90 sec
We are interested in event anisotropy. It is one of reasons why
you are here. OK?
The event anisotropy is sensitive to the initial state.In the
low pT region, we see collectivity of hadron and parton, and it
relate to thermalization and recombination in the early stage.And
the energy loss by jet quenching is also important to find an
evidence of dense matter, that is, QGP.
This talk focuses on pi0, photon, and electrons.pi0 is good
observable as identified hadron because technically the pT coverage
in larger than the other hadrons.And it makes large contribution of
the decay to the photon and electrons yields.
We can have early stage of information by photon due to small
cross section.We dont know whether photon flow exist, but if there
is, it is interesting.
Our goal of electron analysis is for the open charm and bottom
measurement.It is interesting to see flow and energy loss of heavy
flavors.60 sec
The phenix experiment is at RHIC where stay in New York, Long
Islands.You can see the RHIC from the satellite.The PHENIX is here
at RHIC.Photons pi0 are measured be Electro-Magnetic
Calorimeters.Electron is identified by RICH detector and EMC. The
event centrality is defined by Beam-Beam counters and Zero-Degree
Calorimeter stay hereThe selection of centrality is like this in
PHENIX.
The analysis of pi zero v2 is done as the following steps.The
Reaction plane is defined by charged multiplicity on Beam-Beam
counters.The pi zero is reconstructed by two photon measured by
EMC.Both information are combined and we obtained pi zero
distribution as a function of the following formula.Here, the cross
section is describe pT, rapidity and Fourier expansion of phi minus
reaction plane.The vn is event anisotropy parameter measured and it
is smeared by uncertainty of reaction plane.It is corrected by
reaction plane resolution.
3 sec
let me start from gamma and pi0 v2 results.90 sec
Here is inclusive photon v2 and pi0 v2 as a function of pT for
there centrality bins, top 20, 20-40, 40-60 %.You can see the both
v2 are increasing with pT until around 3 GeV of pT, then
saturated.The photon we measured is including hadron decays mainly
pi0.For the our goal, we need to subtract the decay effect to see
thermal and direct photonHowever, to see them, we need more
statistics.
60 sec
I said, we need more statistics.However, it is no reason to wait
for starting the decay effect study until we have fine data.This is
a result of the study.Assuming pi0 v2 as shown by solid line, we
can generate pi0 and process decay effect in Monte-Carlo.The tool
is ready, then once we have better statistics we can subtract the
decay effect from inclusive photon.
This slide shows analysis procedure.At first, invariant mass
distributions of gamma pair are obtained from same event and mixed
event.The black points are from same event and red is from mixed
event.To generate mixed event. we select similar reaction plane
direction, centrality and vertex positions.After combinatorial
background subtraction, the distribution is like this.You can see
the other component of background around pi zero peak.Its origin
are hadronic shower, conversion electron, and also a correlation of
gamma-gamma in the event.However, our goal is to count number of pi
zero, therefore we assumed the second background by linearshape to
subtract second background.After counting number of pi zero, it is
plotted as a function of phi minus reaction plane.To obtained v2,
we used this formula.The red curve shows fit results and green
lines shows deviation bye error of v2. Counting number of pi zero
is done for each centrality, pT, and phi minus reaction plane.To
check the analysis confidence, I checked all of mass distribution
bin by bin.Here I show the examplesinvariant distribution before
and after combinatorial background.then pi 0 as a function of phi
minus reaction plane