Quark Matter 2005 Conference   Quark Matter 2005 Conference


Rapidity Dependence of Pion Elliptic Flow at RHIC

Presenting Author: Hironori Ito

Author(s): H. Ito and Erik Johnson

Collaboration: BRAHMS

Abstract:

The measured elliptic flow (v2) as a function of pt and centrality at RHIC suggests the created medium in Au+Au collisions achieves early local thermal equilibrium that is followed by hydrodynamic expansion. These measurements of identified particle v2 have been limited, however, to a narrow region about mid-rapidity. Charged-hadron v2 measurements show a significant reduction at forward pseudorapidities. For identified particles, the v2 rapidity dependence is not known. The BRAHMS experiment provides unique capabilities to measure v2 of identified particles at forward rapidities. Using the BRAHMS multiplicity array to determine the v2 event plane, identified particle elliptic flow can be measured using the BRAHMS spectrometers, with 0<eta<3.4. This talk will discuss pion elliptic flow at eta=0, 1, 2.7 and 3.4 from Au+Au collisions at sqrt(snn)=200 GeV. In addition, the pt-integrated flow for charged hadrons obtained using just the multiplicity array will be presented.


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