Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX...
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![Page 1: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/1.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1
Measurement of the light Measurement of the light mesons with the PHENIX mesons with the PHENIX
experiment at RHICexperiment at RHIC
Victor Riabov Victor Riabov
for the Collaborationfor the Collaboration
![Page 2: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/2.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 2
What do we learn from light mesons (, K, , )
PHENIX experimental capabilities Analyzed decays Detectors and triggers Experimental conditions and background
Results: Spectra and cross checks Integrated yields Particle ratios Nuclear modification factors RAB
Mass Peak Shape
Summary
OutlineOutline
![Page 3: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/3.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 3
In p+p: Test of pQCD at large momentum transfer
(parton distribution and fragmentation functions) Strangeness content of the event (K,) Non-identical particle ratios (heavier mesons to 0) Reference for heavy ion collisions
In Heavy Ions collisions: Nuclear modification factors, high pT suppression, Cronin effect
An insight at the Chiral Symmetry Restoration (ω,) - line-shape analysis- particle yields in hadron and di-electron decay channels
MotivationMotivation
![Page 4: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/4.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 4
Analyzed decaysAnalyzed decays
PHENIX acceptance : -0.35 < < 0.35
2 x 90o for two armsBBC (vertex) dz = 0.5cm… 2cm
BBC (trigger) ε = 50%… 92%
DC/PC1 (tracking) dpT/pT ~ 1.0%•pT + 0.7%
EMC (calorimetric) dE/E ~ 8.1%/√E + 3.0%
EMC (t.o.f.) dτ ~ 500 ns
EMC (e/π rejection) ~10
EMC (γ-trigger) 0.4GeV… 2.5GeV
PC3 (matching) 2-4 mm
TOF dτ ~ 100 ns
RICH (e/π rejection) >1000
K+K- BR = 49.2 0.7% e+e- BR = 2.97 0.04% e+e- BR = 7.18 0.12% 0 BR = 8.90 0.25% 0+- BR = 89.1 0.7%
BR = 39.39 0.24% 0+- BR = 22.68 0.35% KS 00 BR = 30.69 0.05%K± using ToF
![Page 5: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/5.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 5
TriggersTriggersG
amm
aF
inal
m
eso
n
PRC75 (2007) 024909
Minimum bias
EMC-RICH electron trigger
High pT gamma trigger
Due to many particles in the final state of hadron decays even very high pT are affected by the efficiency rising region. Comparison to minimum bias trigger sample at low and intermediate pT is very important
![Page 6: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/6.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 6
p+p Au+Aud+Au - meson decay modes- meson decay modes
K+K- p+p √sNN=200 GeV K+K- d+Au √sNN=200 GeV K+K- Au+Au √sNN=200 GeV
e+e- Au+Au √sNN=200 GeV
had
ron
ic
lep
ton
ic
PHENIX measures clear signal of K+K- in all collision systemsMeasurement of e+e- is complicated by combinatorial background
e+e- d+Au √sNN=200 GeV
Analysis is not complete
e+e- p+p √sNN=200 GeV
![Page 7: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/7.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 7
- meson decay modes- meson decay modes0 Au+Au √sNN=200 GeV
ω e+e- Au+Au √sNN=200 GeV
ω
ω e+e- d+Au √sNN=200 GeV
ω
had
ron
ic
lep
ton
ic
PHENIX has measurement of ω in p+p, d+Au & Au+AuMeasurement of ωe+e- complicated by combinatorial background
0+- p+p √s =200 GeV 0 p+p √s =200 GeV
η
ω
p+p Au+Aud+Au
ω e+e- p+p √s=200 GeV
Analysis is not complete
![Page 8: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/8.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 8
, K, Kss - meson decay modes - meson decay modes
Au+Au √sNN=200 GeV
K s
PHENIX has measurements of in p+p, d+Au & Au+AuMeasurement of Ks in Au+Au are in progress
p+p √s =200 GeV d+Au √s =200 GeV
p+p Au+Aud+Au
Ks 00 p+p √s=200 GeV
Analysis is not complete
![Page 9: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/9.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 9
p+p Au+Aud+Au
- meson spectra- meson spectra
PHENIX has a complete set of measurement of K+K-
First results on e+e- suffer from lack of statistics e+e- analysis in p+p is in progress
![Page 10: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/10.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 10
ωω - meson spectra - meson spectra
0+- (0) p+p, d+Au, AuAu √sNN =200 GeV
hadronic
leptonic
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
ω e+e- Au+Au √sNN=200 GeV
PHENIX Preliminary
![Page 11: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/11.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 11
Result consistency checksResult consistency checks
Agree
K
Agree
K
Similar analysis
Similar analysis
Agree
nucl-ex/0702046 (QM2006) PRC75 (2007) 024909
![Page 12: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/12.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 12
- meson yield and temperature- meson yield and temperature
-meson temperature ~same @√sNN=62,200 GeV & is constant with Npart
-meson yield grows both with √sNN & centrality Yield in e+e- channel seems to be higher than that in hadronic channel. More accurate measurements are required to make any conclusions
![Page 13: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/13.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 13
ηη,K / ,K / 00 ratioratio 2 K0
S 00
nucl-ex/0702046 (QM2006)
PRC75 (2007) 024909
/0 in p+p @√sNN = 200 GeV = 0.48 ± 0.02(stat) ± 0.02(syst) /0 in d+Au @ √sNN = 200 GeV = 0.47 ± 0.02(stat) ± 0.02(syst) /0 in Au+Au @ √sNN = 200 GeV = 0.40 ± 0.04(stat) ± 0.02(syst)Ks/0 in p+p @ √sNN = 200 GeV = 0.45 ± 0.01(stat) ± 0.05(syst)
![Page 14: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/14.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 14
(()) / / 00 ratioratio
nucl-ex/0611031 acc. to PRC
ω0+- ω0
nucl-ex/0702046 (QM2006)
/0 in p+p Run5 @ √s = 200 GeV = 0.81 ± 0.02(stat) ± 0.07(syst)/0 in d+Au Run3 @ √sNN = 200 GeV = 0.94 ± 0.08(stat) ± 0.12(syst)
![Page 15: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/15.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 15
Nuclear Modification FactorNuclear Modification FactorAu+Aud+Au
ω
RA
A
RdA for all light mesons compatible with oneRAA for ω & at high pT is below one, same as other mesons
![Page 16: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/16.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 16
p+p Au+Aud+Au
PHENIX Preliminary PHENIX Preliminary
Mass peak shapeMass peak shape
ω
All measurements at low pT show agreement with PDG ω provides no evidence of change in mass at high pT
![Page 17: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/17.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 17
PHENIX has measured , Ks, ω and - mesons in hadronic and di-electron decay channels
All mesons behave consistently with other mesons in different collision systems and at different energies.
The baseline measurements (p+p √s=200GeV) exist in hadronic channels and are being analyzed in leptonic channel using accumulated data.
Measured particle ratios at high pT are:/0 in p+p @ √s = 200 GeV = 0.81 ± 0.02(stat) ± 0.07(syst)/0 in d+Au @ √sNN = 200 GeV = 0.94 ± 0.08(stat) ± 0.12(syst)/0 in p+p @ √sNN = 200 GeV = 0.48 ± 0.02(stat) ± 0.02(syst)Ks/0 in p+p @ √sNN = 200 GeV = 0.45 ± 0.01(stat) ± 0.05(syst)
Current di-electron analysis in heavy ion collisions is in progress and needs improvement on the background conditions and more data. Next major step is to take high statistics and high purity di-lepton measurement in (d)A+A
SummarySummary
![Page 18: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/18.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 18
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Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 19
![Page 20: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/20.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 20
PHENIX ExperimentPHENIX Experiment
e+
e-
,ω
PHENIX acceptance : -0.35 < < 0.35
2 x 90o for two arms
K+K- BR = 49.2 0.7% e+e- BR = 2.97 0.04 10-
4 e+e- BR = 7.18 0.12 10-
5
0 BR = 8.90 0.25% 0+- BR = 89.1 0.7%
![Page 21: Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 1 Measurement of the light mesons with the PHENIX experiment at RHIC Victor Riabov for the Collaboration.](https://reader030.fdocuments.in/reader030/viewer/2022032611/56649e845503460f94b857df/html5/thumbnails/21.jpg)
Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 21
Compare of all ->KK data
Run4