Anisotropic flow nu2 in Au + Au collisions at RHIC Page: 4 of 6
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Au + Au at NN=200GeV-
0.06 RQMD(v2.4)
Oa
0.05
N
0.04 \ A e PT (GeV/c) 3
" "~ O O 0 0 0.4-0.86
pM 0
\p 0 00.n 4-0.6
0.02 -" " 0 -
. ----...
O S " " " 0.2-0.4
0.01
------- pTintegrated
0
0 5 10 15 20 25 30 35
Freeze-out time (fm/c)
Figure 3: RQMD 'r v2 versus freeze-out time for several pT windows. All data are from minimum bias
Au + Au collisions at s-NN= 200 GeV. Dashed-line represents the pT integrated distribution. The
higher the pT , the higher the values of v2 and the sooner it reaches the saturation.
taking place in high-energy nuclear collisions. Fig.4 shows the collision centrality dependence of the v2
for 'r, K, p, and A. Both the hydrodynamic behavior at the low pT region and hadron type dependent
at the intermediate pT region are observed in all centrality bins. The importance of the obervation is
that the explanation of the number of constituent quark is not unique because hadronic interactions
alone also predict the hadron type dependence.
In high-energy nuclear collisions the density is high at the center of the created fireball - there is
matter density grediant. The interactions among the constituents will therefore push matter moving
out-wards. In this way the collective flow is developed in nucleus-nucleus collisions [3]. We would
like to stress that flow means matter and energy flow. It is independent of the type of particles,
either partons or hadrons, or different kinds of hadrons. Hence by studying the collective motion of
the produced hadrons one should be able to, in principle, extract the information of early collision
dynamics [1, 2, 21].
v2(pT) a jj -x(ppT) Op(t,x,y,pT)dAz(xy)dt (1)
where Z denotes the hyperspace where hadrons are emitted the - is the interaction cross-section
which, in principle, depends on the particle density and relative momenta. The p is the particle
density that is a function of collision time t, location, and momentum. The transverse flow is intimately
related to the pressure density which is in turn depends on the density and temperature of the matter
understudy [22]. At low pT region the frequent re-scatterings, in this case among the hadrons, lead to
hydrodynamic like mass dependence.4
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Lu, Y.; Bleicher, M.; Liu, F.; Kiu, Z.; Sorensen, P.; Stocker,H. et al. Anisotropic flow nu2 in Au + Au collisions at RHIC, article, August 20, 2005; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc878779/m1/4/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.