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2008 Oct. ATHIC @ Tsukuba
Misaki Ouchida Hiroshima University For the PHENIX Collaboration
ωωω
e +
e ー
γ
γ
π+π0
γ
π ーπ0
γ γ
Low mass vector meson measurements at RHIC
Systematic Measurement ofomega mesons in PHENIX
ー ーー ー
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Misaki Ouchida2008 Oct. ATHIC @ Tsukuba
OUTLINE
• Introduction Why Low Mass Vector mesons ?
• Experiment Which decay mode do we measure in PHENIX?
Gaussian (Mean and With are Fixed by Embedding simulation)
after subtraction of
BG1+BG2+BG3
coun
t
Reconstructed invariant mass
Mixed event
0sK
Analysis Highlight How do we approach?
Subtracting Backgrounds ( 3 body: ( 2)
BG1 BG2
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Misaki Ouchida2008 Oct. ATHIC @ Tsukuba
• Spectra (p+p & d+Au)
Results & Discussion What do we see?
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Misaki Ouchida2008 Oct. ATHIC @ Tsukuba
• Spectra (Au+Au) , e+e- @ Au+Au
Results & Discussion What do we see?
Suggesting Hadron suppression
Get
tin
g d
ow
n
Get
tin
g d
ow
n
in h
igh
er c
entr
alit
y
in h
igh
er c
entr
alit
y
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Misaki Ouchida2008 Oct. ATHIC @ Tsukuba
Results & Discussion What do we see?
Interesting systematic measurement of hadron suppression
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Misaki Ouchida2008 Oct. ATHIC @ Tsukuba
Results & Discussion What do we see?
Interesting systematic measurement of hadron suppression
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Misaki Ouchida2008 Oct. ATHIC @ Tsukuba
Summary
• PHENIX measured Low Mass Vector Meson, φandω production in both leptonic and hadronic channels in different collision system.– Spectra show good agreement among several deca
y channels in p+p and d+Au– A+A results have an ability to discuss hadron suppr
ession providing intriguing systematic results.
Physics…
Low pT High pT
Signal for Chiral Symmtery Restoration
Signal for Hadron Suppression
yet to be discussed…provide intriguing result
Systematic measurement of omega in PHENIX will be published in near furtureSystematic measurement of omega in PHENIX will be published in near furture
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Misaki Ouchida2008 Oct. ATHIC @ Tsukuba
Back upBack up
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Misaki Ouchida2008 Oct. ATHIC @ Tsukuba
Chiral Symmetry Restoration
Chiral symmetry is restored<qq> → 0
Chiral symmetry is spontaneously broken <qq>~250 MeV