Radial Flow Study from Identified Hadron Spectra in Au+Au collisions at 200GeV
Interplay between v2 and jets at 200GeV Au+Au collisions at RHIC-PHENIX ShinIchi Esumi for
description
Transcript of Interplay between v2 and jets at 200GeV Au+Au collisions at RHIC-PHENIX ShinIchi Esumi for
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 1
Interplay between v2 and jets at 200GeVAu+Au collisions at RHIC-PHENIX
ShinIchi Esumi for the PHENIX collaboration Univ. of Tsukuba
One preliminary plotMany simulationsSummary
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 2
r.p.
Reaction plane
parton
parton
hadrons
p+p collisionA+A collision
r.p. for a geometrical originsuffer r.p. resolution (smeared shape)dN/d(-) = N (1 + 2vn
’cos(n(-)))
no smearing (detailed shape analysis)event anisotropy shape (no relation to r.p.)Nreal ()/Nmixed() = N (1 + 2vn
2cos(n()))
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 3
v2
pair wise correlation analysis
reaction plane based analysis(r.p. ||=3~4)
PHENIX Preliminary qm02
pT (GeV/c)
min. bias
Au+Au at sqrt(sNN)=200GeV
PHENIX
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 4
Teff = 350 MeV blue-shifted temperature
pQCD spectrum shifted by 2.2 GeV
Models (hydro+recombination+jets)
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 5
track- true -> v2track- measured -> v2*resolutiontrack1 - track2 -> v2*v2
reduced correlation because of v2*v2, but smaller error bar because of a large pair combination
simulation
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 6
Flow+Jets simulation
hydro:v2hydro
jets:v2jets
sum
v2hydro
v2jets
v2sum
v2sum
v2pair
back-to-backjets like effect
like (90deg)decay effect
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 7
simulation
v2hydro
v2jets
V2jets=0
V2jets=0
reducedjets yield
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 8
simulation
v2hydro+v2
jets
reaction planebased analysis
pair wisecorrelationanalysis
No (90deg)like decay effect
No (90deg)like decay effect +reduced v2
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 9
jets only
flow only (wrong!)
flow + flow&jets cross term
flow+jets
V2jet=0 : reduce v2 just as BG
V2jet>0 : almost no change or
increase in v2
track1 - track2 track1 - track2|
r.p.
in-plane pair
out-of-plane pair
in between
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 10
simulationin-plane out-of-planeaverage
0<pT1<1GeV/c 1<pT1<2GeV/c 2<pT1<3GeV/c 3<pT1<6GeV/c
track1 - track2
flow like (1+cos) component subtracted, fitted 2 Gaussians (back-to-back jets) term
hydro flow, flowing jets, like decay
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 11
simulation
No flowing jets
No flowing jets,reduced jets yield
No like decay
No like decay,reduced v2
0<pT1<1GeV/c 1<pT1<2GeV/c 2<pT1<3GeV/c 3<pT1<6GeV/c
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JPS, 03/Sep/11 ShinIchi Esumi, Univ. of Tsukuba 12
Summary
1) Non-flow effect is not always additive.2) Quenched jets and daughter hadrons would make finite v2 at high pT.3) Is v2 saturation/reduction caused by quenched jets or by quark flow? -> quark number scaled v2 of identified hadrons