Speaker
Dr
Monika Sharma for the STAR Collaboration
(Wayne State University)
Description
The event anisotropy measurements at RHIC suggest the matter created in heavy-ion collision flows with very little viscosity. Precise determination of "shear viscosity-to-entropy density"
ratio is currently a subject of extensive study[1]. We present measurements of differential transverse momentum correlation functions from the STAR experiment in Au+Au collisions
at $\sqrt{s_{NN}}$ = 200 GeV. We analyze the data based on two
differential correlation functions, namely $inclusive$ and a differential version of the correlation measure $\tilde{C}$
introduced by Gavin[1,2]. The correlation function of the particles are measured as a function of pseudo-rapidity and azimuthal angle in the range $0.2<p_{T}<2.0$ GeV/c at mid rapidity ($|\eta|<1.0$) for various collision centralities. We report estimates of the viscosity based on
the argument that the evolution of the width of the correlation functions is dominated by viscous broadening.
References
[1] S. Gavin and M. Abdel-Aziz, Phys. Rev. Lett. 97 (2006) 162302.
[2] M. Sharma and C.A. Pruneau, Phys. Rev. C 79 (2009) 024905.
Author
Dr
Monika Sharma for the STAR Collaboration
(Wayne State University)
