Heavy Flavor Workshop, Beijing, China, 2006.11.22ShinIchi Esumi, Univ. of Tsukuba1 Heavy flavor...
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![Page 1: Heavy Flavor Workshop, Beijing, China, 2006.11.22ShinIchi Esumi, Univ. of Tsukuba1 Heavy flavor collective flow measurements at RHIC ShinIchi Esumi Univ.](https://reader036.fdocuments.net/reader036/viewer/2022070606/5a4d1b697f8b9ab0599b23b3/html5/thumbnails/1.jpg)
Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 1
Heavy flavor collective flow measurements at RHIC
ShinIchi Esumi
Univ. of Tsukuba
In collaboration with : H. Huang, Y. Miake, S. Sakai, N. Xu, Y. Zhang
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 2
x
z
Non-central Collisions
locally thermal
Radial Collective Expansion
Analysis of Collectivity in Heavy Ion Collisions
Radial Flow
Elliptic and DirectedFlow
boost
coalescence/hydro jet suppression/geometry
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 3
PHENIX preliminary
annihilationcompton scattering
Bremsstrahlung (energy loss)prompt photon v2 = 0
v2 < 0thermal photon v2 > 0
Jet-frag. photon from the survived partonv2 > 0
direct photon as a probe of bulk matter
consistent with prompt photon production,
but we are free to speculate.
QM06
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 4
STAR preliminary
v2 scaling with mT-m + number of quark
v2
pT (GeV/c)
RQMD Au+Au 200GeVFeng Liu, QM06
No separation in freeze-outMass effect after freeze-outFeed down effect maskedLow pT part squeezed Scaling in RQMD
mass
mT sl
ope
A+A
p+p
radial flow QM06
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 5
Ne : inclusive electron yield
material amounts : 0
1.1% 1.7%
Dalitz : 0.8% X0 equivalent
0
With converterConversion in converter
W/O converter
0.8%
Non-photonic
Conversion from known material
? %
Photonic
cocktail method converter method
eID with RICH
B.G. BG subtracted
energy – momentum matching Method
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 6
Non-photonic electron spectra and RAA
nucl-ex/0611018
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 7
Non-photonic electron RAA vs pT (centrality dependence)
QM06
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 8
π v2 nucl-ex/0608033
Estimation of photonic electron v2sim
ulationsubtraction
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 9
v2incl. =
Nnon-ph. v2non-ph. + Nphot. v2
phot.
Nnon-ph. + Nphot.
Non-photonic electron v2
QM06
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 10
centrality dependence of non-photonic electron v2 compared with hadrons PH
ENIX R
UN
2 PH
ENIX R
UN
4
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 11
hint #0 of charm quark collectivity
STARnucl-ex/0611018
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 12
u/d/(s) quarks v2
c quark v2
quark pT (GeV/c)
quar
k v 2
Shingo preliminary
D meson v2
D m
eson
v2
pT (GeV/c)
PHENIX preliminary data
electron v2 fromD meson decay
v2D(pT) ~ v2q(pT*1/6) + v2c(pT*5/6)
Estimation of D-meson and charm quark v2 (I)
SQM06
v2 shape assumption for D-mesonmagnitude fitted to minimize 2
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 13
minimum resultD->e
2
4
1
2 minimum : a = 1, b = 0.96 (2/ndf = 22/27)
v2(u,d,s) ~ v2(c)
universal v2 (pT) for quark
v2(pT) ~ 2*v2q(pT*1/2) v2p(pT) ~ 3*v2q(pT*1/3) v2D(pT) ~ v2q(pT*1/6) + v2q(pT*5/6)
Simultaneous fitting of /K/p/e v2
Estimation of D-meson and charm quark v2
(II)
QM06
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 14
Does it follow the scaling with other hadrons? This is when we assume D meson v2 has same pT dependence as proton. This is at the lower limit of D meson v2 from the previous page 12. We can not rule out that D-meson flowing with other hadrons.Quark mass difference is neglected here. (nq=2)
QM06
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 15
HP06
Estimation of B-meson contribution
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 16
HP06
combination of D- and B-meson
We need to increase B contribution further more even with v2b=0.It will be more difficult to explain RAA .
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 17
HP06
D meson only (b/c=0) case : no-bottom at allCharm v2 reduction at high pT is preferred.
electron v2 from D-meson alone with v2 reduction at high pT
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 18
Pythia D-meson decay
electron pT
D-m
eson
pT
case 1
case 2
input D-meson v2
output electron v2
input D-meson v2
output electron v2
1st 2nd 3rd 4th 5th
iteration
Difference between expected and output electron v2 is used to feed back the input D-meson v2 without shape assumption.
Slight difference in feed back procedure and expected electron v2 between case1 and case2.
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 19
case 1 case 2
electron v2 from D-meson alone without assumption in D-meson v2 shape
input pythia D-meson v2
output pythia electron v2expected electron v2(parameterized by experimental data)
v2
pT (GeV/c)
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 20
AuAu Central charm hadron
AuAu Central , K, p
AuAu Central strangeness hadron
SQM06, Yifei Zhang
hint #1 of charm quark collectivity
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 21
N. Xu, SQM 2006, PHENIX (, K, p, J/): PRC69, 034909(04), QM05; STAR (, , ): QM05
RHIC
SPS SPS
hint #2 of charm quark collectivity
PHENIX J/
PBM et. al. QM06
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 22
hint #3 of charm quark collectivity
QM06
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 23
heavy flavor tracker, silicon vertex detectordirect measurement D meson v2
new reaction plane detectorgood resolution => reduce error from R.P. J/ψ v2 & high pT non-photonic electron v2
Reaction plane detector for PHENIX
Heavy Flavor Tracker for STARVertex Tracker, Forward
Calorimeter for PHENIX
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Heavy Flavor Workshop, Beijing, China, 2006.11.22 ShinIchi Esumi, Univ. of Tsukuba 24
Summary
Charm quark shows collectivity at RHIC.