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

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

STAR

Collaboration

Apr, 2005

6 pages

Published in:

Phys.Rev.Lett. 95 (2005) 122301

e-Print:

nucl-ex/0504022 [nucl-ex]

DOI:

10.1103/PhysRevLett.95.122301

Experiments:

BNL-RHIC-STAR

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Abstract:

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.

Note:

6 pages, 3 figures, submitted to PRL

25.75.Ld
heavy ion-nucleus reactions
nuclei with mass number 190 to 219
Xi baryons
parton model
Omega baryons
nucleus nucleus: colliding beams
scattering: heavy ion
gold
hyperon: hadroproduction

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