flow workshop, bnlshinichi esumi, tsukuba1 charged particle v2 and azimuthal pair correlation with...
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flow workshop, BNL ShinIchi Esumi, Tsukuba 1
Charged particle v2 and azimuthal pair correlation with respect to the reaction plane at PHENIX
ShinIchi Esumi for the PHENIX collaboration Univ. of Tsukuba
v2 from r.p. and pair correlationpair correlation with r.p.my toy simulationidentified particle v2summary
flow workshop, BNL ShinIchi Esumi, 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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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
simulationclose to pure 1+cos func.fine structure in d distri.
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inside a jet (d)
flow + flow&jets + cross jets(a) (b) (c)
flow+jets
track1 - track2
Parameters nf : flow particles nj : # of jet axis with v2ja
np : # of particle per jet v2f : v2 of nf
v2j : v2 of njnp
Harmonic part : 1+2p*cos(d) (a) p=v2fv2f : nf(nf-1) (b) p=v2fv2j : nfnjnp
(c) p=v2jv2j : nj(nj-1)np2
Jet shape : near+far side gauss (d) F(d) : njnp(np-1)
Jet part (c)+(d) : njnp(njnp-1)
(c)
(d)
v2j=0 v2j>0 v2ja=1
0 d
(c)
(d)
(c)
(d)
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Models (hydro/recombination + jets/fragmentation)
hydro+jets recomb.+fragm.
hydro:v2hydro
jets:v2jets
sum
my toy model
pT (GeV/c)dn
/dp T
(arb
. uni
t)
(1) v2 of soft hadrons(2) amount of Jets(3) v2 of jets (energy loss+ almond shape)
flow workshop, BNL ShinIchi Esumi, Tsukuba 6
v2hydro
v2jets
v2sum
v2sum
v2pair
back-to-backjets like effect
like (90deg)decay effect
simulation
r.p. based
data
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simulation
v2hydro
v2jets
V2jets=0
V2jets=0
reducedjets yield
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simulation
v2hydro+v2
jets
reaction planebased analysis
pair wisecorrelationanalysis
No (90deg)like decay effect
No (90deg)like decay effect +reduced v2
flow workshop, BNL ShinIchi Esumi, Tsukuba 9
leading parton
hadrons
Q: Are jets source of v2?Q: Does reaction zone make flowing jets?
track1 - track2|
r.p.
in-plane pair
out-of-plane pair
in between
trigger particlein the selected angular window
hydro:v2hydro
jets:v2jets
sum
pT (GeV/c)
dn/d
p T (a
rb. u
nit)
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sim
ula
tion
0<pT<1GeV/c 1<pT<2GeV/c 2<pT<5GeV/c
track1 - track2
hadron-hadron correlation (pT(trig)>3GeV/c)
hydro flow, flowing jets, like decay are included in the simulation as same as in the previous slide
data
PHENIX preliminary PHENIX preliminary
PHENIX preliminary
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No flowing jets
No flowing jets,reduced jets yield
pT(trig)>3GeV/c 0<pT1<1GeV/c 1<pT1<2GeV/c 2<pT1<5GeV/c
original simulation,hydro flow, flowing jets
200GeV Au+Au data
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PHENIX preliminary
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PHENIX preliminary
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High pT
initial v2=0 energy loss fragmentation
Low pT
(1) (2) (3)
(4)
(1)-(2) hydro press.
(5) (6)
recombination/hadronize/freeze-out
time
time
v2(high pT)
(1)
(2)
(3)
time
v2(low pT)
(4)
(5)(6)
chemical f.o.
thermal f.o.
phase transition
phase transition
flow workshop, BNL ShinIchi Esumi, Tsukuba 15
v2(p
T)
pT
2~3GeV/c
final state after f.o.
initial state just after p.t.
Yield,slope,v2 measurements on
(1),k,p,d,,(2),(3)open charm, J(4) direct
flow workshop, BNL ShinIchi Esumi, Tsukuba 16
quark flow plus hadron flow
minimum bias Au+Auat sNN = 200 GeV
PHENIX preliminaryPHENIX preliminary
flow workshop, BNL ShinIchi Esumi, Tsukuba 17
v2(proton)
v2(pion)
v2(e)
v2 pion & v2 proton :
nucl-ex/0305013 (PHENIX)
pt[GeV/c]
v2
(M.B)
conversion
0 ee
ee, 30
ee, 0ee
ee, ee
ee
’ ee
electron v2 to measurecharm quark v2
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phenix preliminary
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extraction of direct photon v2?!
phenix preliminary
phenix preliminary
direct / inclusive
flow workshop, BNL ShinIchi Esumi, Tsukuba 20
Summary
non-flow is not always additivejets seem to have v2 (not new)jet shape/yield w.r.t. reaction planedifferent identified particles v2