Multi-strange baryon elliptic flow in Au + Au collisions at s(NN)**(1/2) = 200-GeV

The STAR collaboration
Phys.Rev.Lett. 95 (2005) 122301, 2005.

We report on the first measurement of elliptic flow $v_2(p_T)$ of multi-strange baryons $\Xi+\bar{Xi}$ and $\Omega+\bar{Omega} in heavy-ion collisions. In minimum bias Au+Au collisions at sqrt(s_NN) = 200 GeV, a significant amount of elliptic flow, comparable to other non-strange baryons, is observed for multi-strange baryons which are expected to be particularly sensitive to the dynamics of the partonic stage of heavy-ion collisions. The $p_T$ dependence of $v_2$ of the multi-strange baryons confirms the number of constituent quark scaling previously observed for lighter hadrons. These results support the idea that a substantial fraction of the observed collective motion is developed at the early partonic stage in ultra-relativistic nuclear collisions at RHIC.

  • Table 1

    Data from Figure 1a


    $\Xi^{-} + \Xi^{+}$ invariant mass distribution from minimum bias (0–80%) Au + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.

  • Table 2

    Data from Figure 1b


    $\Omega^{-} + \Omega^{+}$ invariant mass distribution from minimum bias (0–80%) Au + Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.

  • Table 3

    Data from Figure 1c and 1d


    Azimuthal distributions with respect to the event plane of the $\Xi^{-} + \Xi^{+}$ and $\Omega^{-} + \Omega^{+}$ raw yields.

  • Table 4

    Data from Figure 2


    $v_2(p_T)$ of $\Xi^{-} + \Xi^{+}$ and $\Omega^{-} + \Omega^{+}$ from 200 GeV Au+Au minimum bias collisions.

  • Table 5

    Data from Figure 3


    Number of quark ($n_q$) scaled $v_2$ as a function of scaled $p_T$ for $\Xi^{-} + \Xi^{+}$ and $\Omega^{-} + \Omega^{+}$...

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