Transcript Recent Results from PHENIX

Strangeness (and heavy flavor) at RHIC
Recent Results
from PHENIX
Masashi Kaneta
RIKEN-BNL Research Center
for the PHENIX collaboration
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
1
Outlook of this talk
• PHENIX experiment
• Recent results from PHENIX
– Event anisotropy
• 62.4GeV Au+Au : p, K, p, and p (comparing with 200GeV)
• 200 GeV Au+Au : Heavy flavor electron
– Single particle spectra of f
• 200GeV d+Au and 200GeV Au+Au
– Anti-Pentaquark search and capability of the other strangeness
• 200GeV p+p, d+Au, and Au+Au
– Heavy Flavor Results from PHENIX
• See talk of H. Pereira (Saclay) on Sep. 17 (Fri)
• Future strangeness and heavy flavor measurement at PHENIX
– Charged hadron identification at high pT: Aerogel Cherenkov Counter
– Upgrade around vertex : Silicon Vertex, Hadron Blind Detector, TPC
Nosecone Calorimeter
• Summary
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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Brazil
China
University of São Paulo, São Paulo
Academia Sinica, Taipei, Taiwan
China Institute of Atomic Energy, Beijing
Peking University, Beijing
France
LPC, University de Clermont-Ferrand, Clermont-Ferrand
Dapnia, CEA Saclay, Gif-sur-Yvette
IPN-Orsay, Universite Paris Sud, CNRS-IN2P3, Orsay
LLR, Ecòle Polytechnique, CNRS-IN2P3, Palaiseau
SUBATECH, Ecòle des Mines at Nantes, Nantes
Germany University of Münster, Münster
Hungary Central Research Institute for Physics (KFKI), Budapest
Debrecen University, Debrecen
Eötvös Loránd University (ELTE), Budapest
India
Banaras Hindu University, Banaras
Bhabha Atomic Research Centre, Bombay
Israel
Weizmann Institute, Rehovot
Japan
Center for Nuclear Study, University of Tokyo, Tokyo
Hiroshima University, Higashi-Hiroshima
KEK, Institute for High Energy Physics, Tsukuba
Kyoto University, Kyoto
Nagasaki Institute of Applied Science, Nagasaki
RIKEN, Institute for Physical and Chemical Research, Wako
RIKEN-BNL Research Center, Upton, NY
Rikkyo University, Tokyo
Tokyo Institute of Technology, Tokyo
University of Tsukuba, Tsukuba
Waseda University, Tokyo
S. Korea Cyclotron Application Laboratory, KAERI, Seoul
Kangnung National University, Kangnung
Korea University, Seoul
Myong Ji University, Yongin City
System Electronics Laboratory, Seoul Nat. University, Seoul
Yonsei University, Seoul
Russia
Institute of High Energy Physics, Protovino
Joint Institute for Nuclear Research, Dubna
Kurchatov Institute, Moscow
PNPI, St. Petersburg Nuclear Physics Institute, St. Petersburg
St. Petersburg State Technical University, St. Petersburg
Sweden Lund University, Lund
12 Countries; 58 Institutions; 480 Participants*
Masashi Kaneta,
USA
Abilene Christian University, Abilene, TX
Brookhaven National Laboratory, Upton, NY
University of California - Riverside, Riverside, CA
University of Colorado, Boulder, CO
Columbia University, Nevis Laboratories, Irvington, NY
Florida State University, Tallahassee, FL
Florida Technical University, Melbourne, FL
Georgia State University, Atlanta, GA
University of Illinois Urbana Champaign, Urbana-Champaign, IL
Iowa State University and Ames Laboratory, Ames, IA
Los Alamos National Laboratory, Los Alamos, NM
Lawrence Livermore National Laboratory, Livermore, Ca
University of New Mexico, Albuquerque, NM
New Mexico State University, Las Cruces, NM
Dept. of Chemistry, Stony Brook Univ., Stony Brook, NY
Dept. Phys. and Astronomy, Stony Brook Univ., Stony Brook, NY
Oak Ridge National Laboratory, Oak Ridge, TN
University of Tennessee, Knoxville, TN
Vanderbilt University, Nashville, TN
of January
2004
RIKEN-BNL Research Center, *as
“Strangeness
at RHIC
: Recent Results from PHENIX”
3
PHENIX
• Collision vertex and centrality
– Beam-Beam Counters (BBC)
– Zero Degree Calorimeters (ZDC)
• Tracking of Charged particle
– Drift Chambers (DC)
– Pad Chambers (PC1, PC2, PC3)
• p, K, p, d, ... ID by Time-Of-Flight
– Start timing from BBC
– Stop timing from
High resolution TOF detectors (TOF)
TOF from Lead Scintillator EMCal (PbSc)
• Electron ID
– Ring Image Cherenkov (RICH) detectors
– EMCal (PbSc, PbGl)
• Photon (p0, h, ...)
– EMCal (PbSc, PbGl)
• Muon
– Muon Tracker (MuTr)
Cathode-strip readout chamber
– Muon Identifier (MuID)
Streamer (Iarocci) tube and steel
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
4
Publication about Strangeness and Heavy Flavor
• Single Identified Hadron Spectra from sNN = 130 GeV Au+Au Collisions
–
K. Adcox et al., Phys. Rev. C 69, 024904 (2004)
• Centrality dependence of p, K, p andp production from sNN =130 GeV Au+Au collisions
at RHIC
–
K. Adcox et al., Phys. Rev. Lett. 88, 242301 (2002)
• Measurement of the L andL particles in Au+Au Collisions at sNN =130 GeV
–
K. Adcox et al., Phys. Rev. Lett. 89, 092302 (2002)
• Identified Charged Particle Spectra and Yields in Au+Au Collisions at sNN = 200 GeV
–
S. S. Adler et al., Phys. Rev. C 69, 034909 (2004)
• Elliptic Flow of Identified Hadrons in Au+Au Collisions at sNN = 200 GeV
–
S.S. Adler et al, Phys.Rev.Lett. 91 182301 (2003)
• Measurement of Single Electrons and Implications for Charm Production in Au+Au
Collisions at sNN =130 GeV
–
K. Adcox et al., Phys. Rev. Lett. 88, 192303 (2002)
• J/y production from proton-proton collisions at s = 200 GeV
–
S.S. Adler et al., Phys. Rev. Lett. 92, 051802 (2004)
• J/y Production in Au-Au Collisions at sNN =200 GeV at the Relativistic Heavy Ion Collider
–
S.S. Adler et al., Phys. Rev. C 69, 014901 (2004)
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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Bulk Properties at RHIC
• What we learnt from RHIC?
– Low pT (<~2GeV/c) phenomena
• Thermalization
– Elliptic Flow
» Agreement with Hydrodynamical calculations
– Chemical freeze-out
» The model well describes the data and strangeness equilibration at RHIC
– Radial Flow
» Single spectra of p, K, p are described by common temperature and flow
velocity
– Intermediate and high pT (>~2GeV/c) phenomena
• Dense matter effect in Au+Au collisions
– High pT suppression in single particle spectra
– Back-to-Back jet suppression
• Different effect in Baryon/meson
Topics related
to this talk
– Mass scaling?
– Due to number of consistent quarks?
– Any difference in flavor (between light quark (u,d) and s)?
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
6
Elliptic Flow
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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Elliptic Flow at 62.4 GeV Au+Au
sNN = 200 GeV Au+Au
centrality : 0-92%
v2
v2
sNN = 62.4 GeV Au+Au
centrality : 0-84%
stat. error only
sys. error <15%
stat. error only
sys. error <20%
PHENIX preliminary
Charged p,K,p : PRL91, 182301 (2003)
p0 : work in progress
pT [GeV/c]
pT [GeV/c]
• Identified particle v2 from 62.4 GeV Au+Au
– Looks similar p, K, p dependence with 200GeV Au+Au
– With more statistics, we will be able to do detail analyses
• Centrality dependence
• More particle species (How about L, f, etc.?)
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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Elliptic flow : nquark Scaling
• A scaling of number of constituent quark
– Quark coalescence picture
• 62.4GeV Au+Au
– The scaling looks
working like 200
GeV Au+Au
– Seems to be
slightly lower than
200 GeV in
pT/nquark<1 GeV/c
v2 /nquark
62.4 GeV Au+Au: PHENIX preliminary
200 GeV Au+Au, charged p,K,p : from PRL
p0 : work in progress
stat. error only
sys. error <20% (62GeV)
15% (200GeV)
pT /nquark [GeV/c]
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
9
v2
v2 of Heavy Flavor Electrons
Estimation of v2
100% of “photonic electron”
“r (pT)”  “
”
Photonic electron : e± from
• Dalitz decay of p0, h, w, f
• di-electron decays r, w, f
• photon conversions
• kaon decays ( pen)
r : photonic electron
/ inclusive electron
v2heavy-flavor-e
=
0.3
0.25
Inclusive
(statistical error only)
0.2
e±
v2
systematic errors of
estimation
Heavy
Heavy
Flavor
e± v2
bin width
V. Greco, C.M. Ko, R. Rapp
nucl-th/0312100
flavor
e±flowv2
w/ charm
w/o charm flow
0.15
Glossary
v2inclusive-e
sNN = 200 GeV Au+Au
centrality : 0-92%
-r
v2photo-electron
1–r
0.1
0.05
0
-0.05
Hor. bar : stat. err.
Box : total sys. err.
-0.1
0
1
2
3
40
1
2
3
4
pT [GeV/c]
• v2 of Heavy flavor electron
– Looks consistent with/without charm flow
– We hope that run4 data will give an answer
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
10
f meson
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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f measurement at PHENIX
• Both K+K- and e+e- channel are available
– K : mass square from Time-of-Flight from TOF detector and EMCal
– e : RICH and EMCal
f  K +K -
Run3 sNN = 200 GeV d+Au
Invariant mass [GeV/c2]
Masashi Kaneta,
f  e+e-
Counts / bin
Counts / bin
Kaon ID : TOF of PbSc EMCal
S ~ 120
S/B = 1/4
Invariant mass [GeV/c2]
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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Single Particle Spectra of f
sNN = 200 GeV Au+Au
1
d2N
[(GeV/c2 ) -2 ]
2p mT dmT dy
PHENIX final data
to be submitted to PRC
10
1
sNN = 200 GeV d+Au, Min. Bias
PHENIX preliminary
10-1
10-1
10-2
10-2
10-3
10-3
10-4
10-4
fK+K-
10-5 0
0.5
1
1.5
2
mT – mass
Masashi Kaneta,
f  e+ef  K+K-
2.5
3
[GeV/c2]
10-5
0
0.5
1
1.5
2
2.5
3
mT – mass [GeV/c2]
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
13
Inverse Slope Parameter and Yield of f
• Extracting inverse slope parameter and yield
– Using a fit function
1
d 2N
dN/dy
 (mT  m )/T

e
2π mT dmT dy 2π T (T  m )
1
d 2N
[(GeV/c2 ) -2 ]
2p mT dmT dy
sNN = 200 GeV Au+Au
PHENIX final data
to be submitted to PRC
yield
10
sNN = 200 GeV d+Au, Min. Bias
1
PHENIX preliminary
stat. err. only
10-1
10-1
10-2
10-2
10-3
10-3
10-4
0.5
1
1.5
stat. err. only
f  e +e f  K+K-
10-4
fK+K-
10-5 0
2
mT – mass
Masashi Kaneta,
Inverse
slope
parameter
2.5
3
[GeV/c2]
10-5 0
0.5
1
1.5
2
2.5
3
mT – mass [GeV/c2]
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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Inverse Slope Parameter and Yield of f
Inverse Slope Parameter [MeV]
200 GeV d+Au (preliminary)
200 GeV Au+Au w/ centrality cut
200GeV Au+Au Min. Bias
• Yield of f
Box : total sys. err.
dN/dy
Hor. bar : stat. err.
Hor. bar : stat. err.
Box : total sys. err.
<Npart>
• Inverse slope of f
– Flat as a function of <Npart>
(dN/dy) / (2<Npart> )
– Increasing with <Npart>
– Not simple linear of <Npart>
200 GeV d+Au
(preliminary)
200 GeV Au+Au
w/ centrality cut
200GeV Au+Au
Min. Bias
• Over d+Au and Au+Au
• Within statistics +
systematic error
0
Masashi Kaneta,
100 200 300
<Npart>
0
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
100 200 300
<Npart>
15
Radial flow
• Single particle spectra of p, K, p,p
– Well described by Blast wave mode (E.Schnedermann et al, PRC48, 2462 (1993)) fit
– Common thermal freeze-out temperature and flow velocity for p, K, p,p
– How about for phi meson?
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
Computed by Akio Kiyomichi (2003 DNP / 2004 JPS meeting)
Fit range : mT – mass < 1 GeV/c2
16
Does f has same Tfo and <bT> with p, K, p ?
• Simultaneous fit
Fit range
mT -mass < 1 GeV/c2
– The c2 contour plot for each particle
200 GeV Au+Au, top 10%
200 GeV Au+Au, 10-40%
200 GeV Au+Au, 40-92%
3s
2s
1s
• Within 3 s
p, K, p,p
– Overlap of f with p, K, p
– Large area of c2 contour for f
• Because of larger statistical error (i.e.
smaller c2) of f than p, K, p
• Need more statistics to conclude
Masashi Kaneta,
p, K, p,p, f
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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Does f has same Tfo and <bT> with p, K, p ?
200GeV Au+Au
p, K, p : PHENIX, PRC 69, 034909 (2004)
f : PHENIX final (to be submitted to PRC)
Fit range mT -mass < 1 GeV/c2
Masashi Kaneta,
• Simultaneous fit by p, K, p,p and f
– Seems to be common Tfo and <bT>
– But don’t hurry up to conclude
– Again, need more statistics
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
18
Intermediate pT phenomena
• Energy loss effect in proton at intermediate pT is
different from pion
sNN = 200 GeV Au+Au
Shown in PHENIX white paper
• Rcp of f is close to
pion rather than
proton
Yield (40 – 92%) / Ncoll(40 – 92%)
Yield (0 – 10%) / Ncoll(0 – 10%)
(=Rcp)
– Note : Those are expected to be merged at very high pT
– Address a scaling
of number of
constituent quarks
– Statistical error is
still large
• Need more statistic
pT [GeV/c2]
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
19
Exotic Particle
Search
in RHIC Energy
at PHENIX
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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Anti-Pentaquark Search
• Pentaquark state is still not
established yet
– Many positive results
– Many negative results
• How about at PHENIX?
– So far, negative with current statistics
– We report a summary of the search in
s(NN) =200 GeV p+p, d+Au, Au+Au
Summary table from hep-ex/0406077
• Motivation: Why anti-pentaquark?
– If a particle exists, anti-particle does
– Anti-Baryon to Baryon ratio is high (>~0.7) at RHIC energy
• Channel
– K+ +n
– PHENIXn measurement is unique at RHIC (so far)
•
•
•
•
Masashi Kaneta,
Large energy deposit in EMCal
Not photon-like shower shape
No charged track association on the candidate
Momentum reconstruction from Time-Of-Flight
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
21
No pT cut
• Comparison of momentum
from TOF and tracking
– Resolution<4%,10%,15%
in pT<1.0, 1.5, 2.0 GeV/c,
respectively
 +
1.1 1.2 1.3 1.4 1.5 1.6
– Invariant mass peak of
:
R.R. 99.85%, c-= 2.396cm
+(1197.4) n + p+ :
B.R. 48.31%, c+= 4.434cm
• Mass shift due to no TOF calibration for
n in EMCal is <~5%
• Quick check by Monte-Carlo shows
agreement with data
Masashi Kaneta,
No pT cut
 -
– Momentum shift <~5%
-(1189.4) n + p-
n + p+
Same event
high pT
photon trigger
Mixed event
MinBias trigger
1.1 1.2 1.3 1.4 1.5 1.6
Invariant mass [GeV/c2]
Marker : Data
Dash line : MC
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
+
 pT
[GeV/c]
mass from PDG
– Applying the reconstruction
method to anti-proton
200 GeV p+p
200 GeV p+p
n + p-
mass peak [GeV/c]
• Anti-n momentum
resolution checked
Counts / bin
Reliability of Anti-n Candidate
22
Counts / bin
•Run3 s = 200 GeV p+p
– Minimum bias trigger
– 35 M events
– 5 MeV/c2 per bin
•Run2 sNN = 200GeV Au+Au
– Minimum bias trigger
Counts / bin
K + +n in p +p, d+Au, Au+Au
•Run3 sNN = 200 GeV d+Au
– Minimum bias trigger
– 91 M events
– 5 MeV/c2 per bin
Same event
Same event
Mixed event
Mixed event
– 36M events
– 4 MeV/c2 per bin
Same event
Mixed event
30-50%
50-92%
Counts / bin
Top 30% central
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
23
More Strangeness at PHENIX
• From combinations of p±,
K±, p,p, andn
K 0s
pT =1-2 GeV/c
pT =1-2 GeV/c
L(1520) ?
• Demonstration from
r0
Not enough
statistics..
– Run3 sNN =200 GeV p+p
– ~24M events of Min Bias trigger
Invariant mass [GeV/c2]
Invariant mass [GeV/c2]
f
• Blue histograms
– Pair from save event
• Red histograms
– Combinatorial back ground
from event mixing from
Min. Bias trigger
– Normalization range
» solid filled area

pT =1-2 GeV/c
pT =1-2 GeV/c
Invariant mass [GeV/c2]
Invariant mass [GeV/c2]

pT =1-2 GeV/c
K*0
pT =1-2 GeV/c
pT =1-2 GeV/c
Invariant mass [GeV/c2]
Masashi Kaneta,
L
Invariant mass
[GeV/c2]
Invariant mass [GeV/c2]
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
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Future Measurement
of Strangeness
and Heavy Flavor
at PHENIX
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
25
Aerogel Cherenkov Counter
• Modules for half sector are installed in 2003
– Left half modules are already installed in July 2004
• Enhancement of PID capability at PHENIX
– Proton separation from p/K up to p = 7 GeV/c
Integration Cube (Air)
PMT
(3 inch)
PMT
(3 inch)
Reflector
(Goretex)
Aerogel
(index~1.011)
Azimuthal angle
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
26
PID Plot with Aerogel Cherenkov Counter
• With(without) requiring Cherenkov light associated
to the track
– We can see pion enhancement (rejection)
– It will be functional to study intermediate pT range
Aerogel Required (Np.e.>3 in each PMT)
Aerogel Veto (Np.e.<1 in each PMT)
Peak position
Experimental resolution (2-sigma) line
Masashi Kaneta,
(calibration is not perfect yet)
Statistics used for this
analysis is less than 4%
of total data from run4
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
27
Upgrade Plan around Vertex
• Silicon Vertex detector and TPC
– Enhancement of momentum resolution
– Measurement of in-flight-decay particle
• Will reduce background at high pT
• Nosecone Calorimeter
h = 0.35
– Jet measurement in
forward region
h = 0.70
• Hadron Blind Detector
h = 0.88
(not shown in the plot)
– Surrounds TPC
– Electron ID by
Cherenkov radiation
detected by a
photocathode layer
h = 1.17
h = 2.6
Provides tracking coverage over -2.6 < h < 2.6
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
28
Summary
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
29
Summary
• Elliptic flow of charged p, K, p from 62.4 GeV Au+Au
– Similar p, K, p dependence with 200GeV Au+Au
– Quark coalescence picture still works in pT /nquark<1 GeV/c
• Heavy flavor electron from 200 GeV Au+Au
– Consistent with/without Charm flow
• Cross section of f meson
– 200GeV d+Au and Au+Au
• Less <Npart> dependence of inverse slope parameter (from mT exponential fit)
• dN/dy increases with <Npart>, but liner scaling
– Study of blast wave model fit
• There is overlap of (Tfo, <bT>) of f with p, K, p
–
–
But large range of within-3-sigma of f
need more statistics for detail analysis
– Rcp is close to pion’s
• support quark number scaling not mass
• Anti-Pentaquark search at PHENIX
– No significant signal in 200 GeV p+p, d+Au, Au+Au
• It might be due to S/N ratio is poor at PHENIX
• Because of no significant peak of L(1520)
– With mixing-event technique, we will have the other strangeness
• New detectors
– Aerogel Cherenkov counters are installed
• PHENIX PID capability (proton separation from p/K) will be increased up to pT=7 GeV/c
– Silicon VTX, HBD, TPC will come to help electron measurements
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
30
About Sound Between Sections
You hear sound between sections. That is from “Noh”
which is Japanese traditional lyrical drama. “Noh” is
completed as current style about 800 years ago in
Muromachi shogunate era. The voice is “Yohhhh.”
Following that, the sound of musical instrument “Pon” is
hit of “Tsuzumi” which is Japanese hand drum. The voice
and sound of Tsuzumi are used for adjustment of timing
and atmosphere of a serif, and changing a scene.
Therefore, I used it for changing section and subject.
By the way, the opening music is not traditional. I
borrowed it from a recent Japanese drama.
Click them
Masashi Kaneta,
{
Masashi Kaneta
Yoh Pon
Yohhh Po Po Pon
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
31
Backup
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
32
BBC Reaction Plane Resolution
<cos(2[FBBCN-FBBCS])>
<sin(2[FBBCN-FBBCS])>
Correlation
200 GeV Au+Au
Correlation
62.4 GeV Au+Au
BBC Charge sum
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
33
Inclusive electron / photonic electron
1/”r”
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
34
Heavy flavor electron v2
photonic electron
non-photonic (=heavy flavor) electron
inclusive electron
{Nv
e
N e  N p  N n. p
2 (e)
 N p v2( p)  N n. p v2(n. p)
v2 ( e ) 

Masashi Kaneta,
N p v 2 ( p )  N n. p v 2 ( n. p )
Ne
Np
Ne
v2( p )

N p v 2 ( p )  ( N e  N p ) v 2 ( n. p )
Ne
 Np 
 v 2( n. p )  r v2( p)  (1  r ) v2( n. p)
 1 
Ne 

RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
35
Anti-Neutron PID
Energy
0.5GeV photon
Energy deposit/tower [GeV]
MC
all charged tracks
Data
1 channel
5.5cm
p-
p+
K-
K+
pbar
p
0.5GeV anti-n
MC
Energy deposit
of absorption
charge  EMC TOF
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
36
PID Capability with ACC
Momentum
[GeV/c]
0.5
1
2
2.5
3
3.7
4
4.2
5
5.5
6
7
~10
p
K
p
TOF
Aerogel (+ TOF or RICH)
RICH
Aerogel : (n=1.011.)
TOF : 100 ps time resolution
RICH : CO2, (n = 1.00041)
Run4 Au+Au 200GeV
p
Masashi Kaneta,
K
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
37
STAR
PHENIX
STAR 200GeV Au+Au
from preprint
sNN = 200 GeV Au+Au
2p mT dm T dy
1
d 2N
[(GeV/c 2 ) - 2 ]
PHENIX final data
to be submitted to PRC
10
1
10-1
10-2
10-3
10-4
10-5
fK+K0
0.5
1
1.5
2
2.5
3
mT – mass [GeV/c2]
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
38
200 GeV Au+Au
w/ centrality cut
200GeV Au+Au
Min. Bias
Hor. bar : stat. err.
Box : total sys. err.
<Npart>
Masashi Kaneta,
Box : total sys. err.
(dN/dy) / (2<Npart> )
200 GeV d+Au (preliminary)
200 GeV Au+Au w/ centrality cut
200GeV Au+Au Min. Bias
200 GeV d+Au
(preliminary)
Hor. bar : stat. err.
dN/dy
STAR 200GeV Au+Au
from preprint
PHENIX
Inverse Slope Parameter [MeV]
STAR
0
100 200 300
0
<Npart>
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
100 200 300
<Npart>
39
STAR
PHENIX
pT<~1 GeV/c
Masashi Kaneta,
RIKEN-BNL Research Center, “Strangeness at RHIC : Recent Results from PHENIX”
40