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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.

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Presentation on theme: "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."— Presentation transcript:

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

2 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 R AB Mass Peak Shape  SummaryOutline

3 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 p T suppression, Cronin effect An insight at the Chiral Symmetry Restoration ( ω,  ) - line-shape analysis - particle yields in hadron and di-electron decay channelsMotivation

4 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 4 Analyzed decays PHENIX acceptance : -0.35 <  < 0.35 2 x 90 o for two arms BBC (vertex) dz = 0.5cm… 2cm BBC (trigger) ε = 50%… 92% DC/PC1 (tracking) dp T /p T ~ 1.0%p T + 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% K S   0  0 BR = 30.69  0.05% K ± using ToF

5 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 5Triggers Gamma Final meson PRC75 (2007) 024909  Minimum bias  EMC-RICH electron trigger  High p T gamma trigger Due to many particles in the final state of hadron decays even very high p T are affected by the efficiency rising region. Comparison to minimum bias trigger sample at low and intermediate p T is very important

6 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 6 p+pAu+Aud+Au  - meson decay modes   K + K - p+p √s NN =200 GeV   K + K - d+Au √s NN =200 GeV   K + K - Au+Au √s NN =200 GeV   e + e - Au+Au √s NN =200 GeV  hadronicleptonic PHENIX measures clear signal of   K + K - in all collision systems Measurement of   e + e - is complicated by combinatorial background   e + e - d+Au √s NN =200 GeV  Analysis is not complete   e + e - p+p √s NN =200 GeV

7 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 7  - meson decay modes  0  Au+Au √s NN =200 GeV ω  e + e - Au+Au √s NN =200 GeV ω ω  e + e - d+Au √s NN =200 GeV ω hadronicleptonic PHENIX has measurement of ω in p+p, d+Au & Au+Au Measurement of ω  e + e - complicated by combinatorial background  0  +  - p+p √s =200 GeV  0  p+p √s =200 GeV η ω p+pAu+Aud+Au ω  e + e - p+p √s=200 GeV Analysis is not complete

8 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 8 , K s - meson decay modes  Au+Au √s NN =200 GeV  KsKs PHENIX has measurements of  in p+p, d+Au & Au+Au Measurement of K s in Au+Au are in progress   p+p √s =200 GeV  d+Au √s =200 GeV p+pAu+Aud+Au K s   0  0 p+p √s=200 GeV Analysis is not complete

9 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 9 p+pAu+Aud+Au  - 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

10 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 10 ω - meson spectra  0  +  - (  0  ) p+p, d+Au, AuAu √s NN =200 GeV hadronicleptonic PHENIX mapped out high p T 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 √s NN =200 GeV PHENIX Preliminary

11 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 11 Result consistency checks  Agree KK K  Similar analysis  Similar analysis  Agree nucl-ex/0702046 (QM2006) PRC75 (2007) 024909

12 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 12  - meson yield and temperature   -meson temperature ~same @√s NN =62,200 GeV & is constant with N part   -meson yield grows both with √s NN & centrality  Yield in e + e - channel seems to be higher than that in hadronic channel. More accurate measurements are required to make any conclusions

13 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 13 η,K /  0 ratio  2 2 K0S 00K0S 00 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)

14 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 14  (  ) /  0 ratio nucl-ex/0611031 acc. to PRC ω  0  +  - ω  0  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)

15 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 15 Nuclear Modification Factor Au+Aud+Au  ω R AA R dA for all light mesons compatible with one R AA for ω &  at high p T is below one, same as other mesons

16 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 16 p+pAu+Aud+Au PHENIX Preliminary Mass peak shape  ω All  measurements at low p T show agreement with PDG ω provides no evidence of change in mass at high p T

17 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 17  PHENIX has measured , K s, 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 p T are:  /  0 in p+p @ √s = 200 GeV = 0.81 ± 0.02(stat) ± 0.07(syst)  /  0 in d+Au @ √s NN = 200 GeV = 0.94 ± 0.08(stat) ± 0.12(syst)  /  0 in p+p @ √s NN = 200 GeV = 0.48 ± 0.02(stat) ± 0.02(syst) K s /  0 in p+p @ √s NN = 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+ASummary

18 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 18

19 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 19

20 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 20 PHENIX Experiment e+e+ e-e- ,ω,ω PHENIX acceptance : -0.35 <  < 0.35 2 x 90 o 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%

21 Victor Ryabov, PNPI SQM 2007 Levoca Jun.27, 2007 21 Compare of all  ->K  K  data Run4

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