Please note that eDoc will be permanently shut down in the first quarter of 2021!      Home News About Us Contact Contributors Disclaimer Privacy Policy Help FAQ

Quick Search
My eDoc
Session History
Support Wiki
Direct access to
document ID:

          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents

ID: 544663.0, MPI für Physik / MPI für Physik
Charged and strange hadron elliptic flow in Cu+Cu collisions at \sqrt{s_{NN}} = 62.4 and 200 GeV
Authors:STAR Collaboration; Abelev, B. I.; Schmitz, N.; Seyboth, P.; Simon, F.; et al.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Physical Review C
Journal Abbrev.:Phys.Rev.C
Issue / Number:81
Start Page:044902
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We present the results of an elliptic flow analysis of Cu+Cu collisions recorded with the STAR detector at 62.4 and 200GeV. Elliptic flow as a function of transverse momentum is reported for different collision centralities for charged hadrons and strangeness containing hadrons $K_{S}^{0}$, $\Lambda$, $\Xi$, $\phi$ in the midrapidity region $|eta|<1.0$. Significant reduction in systematic uncertainty of the measurement due to non-flow effects has been achieved by correlating particles at midrapidity, $|\eta|<1.0$, with those at forward rapidity, $2.5<|\eta|<4.0$. We also present azimuthal correlations in p+p collisions at 200 GeV to help estimating non-flow effects. To study the system-size dependence of elliptic flow, we present a detailed comparison with previously published results from Au+Au collisions at 200 GeV. We observe that $v_{2}$($p_{T}$) of strange hadrons has similar scaling properties as were first observed in Au+Au collisions, i.e.: (i) at low transverse momenta, $p_T<2GeV/c$, $v_{2}$ scales with transverse kinetic energy, $m_{T}-m$, and (ii) at intermediate $p_T$, $2<p_T<4GeV/c$, it scales with the number of constituent quarks, $n_q$. We have found that ideal hydrodynamic calculations fail to reproduce the centrality dependence of $v_{2}$($p_{T}$) for $K_{S}^{0}$ and $\Lambda$. Eccentricity scaled $v_2$ values, $v_{2}/\epsilon$, are larger in more central collisions, suggesting stronger collective flow develops in more central collisions. The comparison with Au+Au collisions which go further in density shows $v_{2}/\epsilon$ depend on the system size, number of participants $N_{part}$. This indicates that the ideal hydrodynamic limit is not reached in Cu+Cu collisions, presumably because the assumption of thermalization is not attained.
Classification / Thesaurus:STAR
Comment of the Author/Creator:18 pages, 14 figures
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Full Text:
You have privileges to view the following file(s):
arxiv:1001.5052.pdf  [462,00 Kb] [Comment:file from upload service]  
The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.