Centrality dependence of v2 in Au   Au at \sqrt{s {NN}}=200  GeVReport as inadecuate

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The European Physical Journal C

, Volume 62, Issue 1, pp 169–173

Unidentified charged hadron v2 with respect to the first harmonic ZDC-SMD event planeFirst Online: 08 April 2009Received: 30 September 2008Revised: 07 February 2009


One of the most striking results is the large elliptic flow v2 at RHIC. Detailed mass and transverse momentum dependence of elliptic flow are well described by ideal hydrodynamic calculations for pT<1 GeV-c, and by parton coalescence-recombination picture for pT=2–6 GeV-c. The systematic error on v2 is dominated by so-called -non-flow effects-, which are correlations other than flow, such as resonance decays and jets. It is crucial to understand and reduce the systematic error from non-flow effects in order to understand the underlying collision dynamics. In this paper, we present the centrality dependence of v2 with respect to the first harmonic event plane at ZDC-SMD v2{ZDC-SMD} in Au + Au collisions at \\sqrt{s {NN}}=200\ GeV. A large rapidity gap |Δη|>6 between midrapidity and the ZDC-SMD could enable us to minimize possible non-flow contributions. We compare the results of v2{ZDC-SMD} with v2{BBC}, which is measured by event plane determined at |η|=3.1–3.9. Possible non-flow contributions in those results will be discussed.

PACS25.75.-q 25.75.Ld  Download to read the full article text

Author: Hiroshi Masui

Source: https://link.springer.com/


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