Elliptic flow in Au + Au collisions at s(N N)**(1/2) = 130-GeV.

The STAR collaboration
Phys.Rev.Lett. 86 (2001) 402-407, 2001.

Elliptic flow from nuclear collisions is a hadronic observable sensitive to the early stages of system evolution. We report first results on elliptic flow of charged particles at midrapidity in Au+Au collisions at sqrt(s_NN)=130 GeV using the STAR TPC at RHIC. The elliptic flow signal, v_2, averaged over transverse momentum, reaches values of about 6% for relatively peripheral collisions and decreases for the more central collisions. This can be interpreted as the observation of a higher degree of thermalization than at lower collision energies. Pseudorapidity and transverse momentum dependence of elliptic flow are also presented.

  • Table 1


    Elliptic flow as a function of centrality defined as nch/nmax. Also given is epsilon, the initial space eccentricity of the...

  • Table 2


    Elliptic flow as a function of transverse momen-tum for minimum bias events

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