Yuriy Riabov QM2006 Shanghai Nov.19, 2006 1 Measurement of the leptonic and hadronic decays of  and ω mesons at RHIC by PHENIX Yuriy Riabov for the Collaboration.

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Yuriy Riabov QM2006 Shanghai Nov.19, Measurement of the leptonic and hadronic decays of  and ω mesons at RHIC by PHENIX Yuriy Riabov for the Collaboration

Yuriy Riabov QM2006 Shanghai Nov.19,  PHENIX capability to measure ω &   Experimental conditions  Results: Spectra Integrated Yields Particle Ratios & R AB Mass Peak Shape  SummaryOutline

Yuriy Riabov QM2006 Shanghai Nov.19, PHENIX Experiment K+K+ K-K-  PHENIX acceptance : <  < 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    e + e - BR = 7.18     0  BR = 8.90  0.25%    0  +  - BR = 89.1  0.7%

Yuriy Riabov QM2006 Shanghai Nov.19, PHENIX Experiment e+e+ e-e- ,ω,ω PHENIX acceptance : <  < 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    e + e - BR = 7.18     0  BR = 8.90  0.25%    0  +  - BR = 89.1  0.7%

Yuriy Riabov QM2006 Shanghai Nov.19, PHENIX Experiment 00    ω PHENIX acceptance : <  < 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    e + e - BR = 7.18     0  BR = 8.90  0.25%    0  +  - BR = 89.1  0.7%

Yuriy Riabov QM2006 Shanghai Nov.19, PHENIX Experiment 00   ω ++ -- PHENIX acceptance : <  < 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    e + e - BR = 7.18     0  BR = 8.90  0.25%    0  +  - BR = 89.1  0.7%

Yuriy Riabov QM2006 Shanghai Nov.19, p+pAu+Aud+Au  - meson decay modes   K + K - d+Au √s NN =200 GeV   K + K - Au+Au √s NN =200 GeV   e + e - d+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

Yuriy Riabov QM2006 Shanghai Nov.19,  - meson decay modes p+pAu+Aud+Au  0  +  -  0  p+p √s =200 GeV  0  Au+Au √s NN =200 GeV ω  e + e - d+Au √s NN =200 GeV ω  e + e - Au+Au √s NN =200 GeV ω ω hadronicleptonic PHENIX has first measurement of ω in p+p, d+Au & Au+Au Measurement of ω  e + e - is as complicated as for  in the same mode η ω

Yuriy Riabov QM2006 Shanghai Nov.19, p+pAu+Aud+Au  - meson spectra d+Au √s NN =200 GeV Au+Au √s NN =62 GeV √s NN =200 GeV d+Au √s NN =200 GeV Au+Au √s NN =200 GeV hadronicleptonic PHENIX has a complete set of measurement of   K + K - in TOF region First results on   e + e - lack statistics.

Yuriy Riabov QM2006 Shanghai Nov.19, ω - meson spectra p+pAu+Aud+Au  0  +  - (  0  ) p+p √s =200 GeV d+Au √s NN =200 GeV  0  Au+Au √s NN =200 GeV ω  e + e - Au+Au √s NN =200 GeV ρ, ω,   e + e - p+p √s=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 PHENIX Preliminary nucl-ex/

Yuriy Riabov QM2006 Shanghai Nov.19,  - meson yield and temperature hadronicleptonic T approximately the same at√s NN =62, 200 GeV and is constant with N part Yield grows both with √s NN and centrality

Yuriy Riabov QM2006 Shanghai Nov.19, ω/  0 ratio hadronic PHENIX Run3 PHENIX Run5 ω results in Run3&5 are consistent ω/ π 0 ratio is flat above p T = 2.5 GeV/c both in p+p and d+Au and close to the ratio at lower √s PYTHIA predicts slightly higher value  /  0 in p+p √s = 200 GeV = 0.85 ± 0.05(stat) ± 0.09(syst)  final  /  0 in p+p √s = 200 GeV = 0.81 ± 0.02(stat) ± 0.07(syst)  preliminary  /  0 in d+Au √s NN = 200 GeV = 0.94 ± 0.08(stat) ± 0.12(syst)  final nucl-ex/

Yuriy Riabov QM2006 Shanghai Nov.19, Nuclear Modification Factor  ω R AA R cp R ω dA √s NN = 200 GeV (final) MB: 1.03 ± 0.11 ± 0.09 (0%-20%): 0.87±0.18 ± 0.08 R ω AA √s NN = 200 GeV (prelim) Peripheral: 1.11 ± 0.27 MB & 0%-20%: 0.37 ± 0.12 R dA for all light mesons are around 1 R AA for ω &  at high p T is below one, same as other mesons Au+Aud+Au nucl-ex/

Yuriy Riabov QM2006 Shanghai Nov.19, p+pAu+Aud+Au Mass peak shape  ω STAR: PRL 92, (2004) All  measurements at low p T show agreement with PDG. ω measurements show no evidence of mass modification at high p T nucl-ex/

Yuriy Riabov QM2006 Shanghai Nov.19, HBD for PHENIX e+e+ e-e- ,ω,ω   e + e - BR = 2.97    e + e - BR = 7.18  Measurements in di-electron channels are complicated because of the combinatorial background coming from  0 decays. The HBD detector installed in PHENIX in Run 7 vetoes electrons which have close partner to reduce the background. We expect to suppress background level by a factor of ~ 100

Yuriy Riabov QM2006 Shanghai Nov.19,  PHENIX measured ω &  production in hadronic channels.  Both mesons behave consistently with other mesons in different collision systems at different energies.  Preliminary results exist on ω &  meson production in e + e - decay channel.  Current situation needs improvement on the background conditions and more data.  The baseline measurements (p+p √s=200GeV) exist in hadronic channels and are being analyzed in leptonic channel using accumulated data.  Next major step is to take high statistics and high purity dilepton measurement in d+A and A+A.Summary

Yuriy Riabov QM2006 Shanghai Nov.19,

Yuriy Riabov QM2006 Shanghai Nov.19,

Yuriy Riabov QM2006 Shanghai Nov.19, ω  0  invariant mass spectra e+pe+C  0  e+p E e =2.8 GeV e+C E e =2.8 GeV Peaks at low masses in the channel may be in part, explained by correlated background from eta, pi0 Ks … CBELSA/TAPS |p  |< 500 MeV/c Preliminary shown by V. Metag on Nov.16, 2006 Plenary ref. to D. Trnka (Gießen) priv. com.c PHENIX  0  p+p √s =200 GeV M.Lutz Nucl. Phys. A (2002)    0  peak Other peaks seen in p+p… Au+Au Correlated background reproduced from the data Part, not all of it!!!

Yuriy Riabov QM2006 Shanghai Nov.19,  & K √s NN

Yuriy Riabov QM2006 Shanghai Nov.19,  MinBias, dAu, 200 GeV PHENIX preliminary 1/2  m T dN/dm T dy (GeV/c 2 ) -2 dAu  KK dAu  ee M T (GeV/c 2 )

Yuriy Riabov QM2006 Shanghai Nov.19,   KK in pp collisions: Comparison with STAR

Yuriy Riabov QM2006 Shanghai Nov.19, Comparison of  ->K  K  data  Results are self consistent in PHENIX  The gap between PHENIX and STAR exist in different energies and systems