Measurements of azimuthal anisotropy and charged-particle multiplicity in $d$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=$200, 62.4, 39, and 19.6 GeV

Abstract

We present measurements of the elliptic flow, $v_2$, as a function of transverse momentum ($p_T$), pseudorapidity ($\eta$), and centrality in $d$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=$200, 62.4, 39, and 19.6 GeV. The beam-energy scan of $d$$+$Au collisions provides a testing ground for the onset of flow signatures in small collision systems. We measure a nonzero $v_2$ signal at all four collision energies, which, at midrapidity and low $p_T$, is consistent with predictions from viscous hydrodynamic models. Comparisons with calculations from parton transport models (based on the {\sc ampt} Monte Carlo generator) show good agreement with the data at midrapidity to forward ($d$-going) rapidities and low $p_T$. At backward (Au-going) rapidities and $p_T>1.5$ GeV/$c$, the data diverges from {\sc ampt} calculations of $v_2$ relative to the initial geometry, indicating the possible dominance of nongeometry related correlations, referred to as nonflow. We also present measurements of the charged-particle multiplicity ($d{N}_{\mathrm{ch}}/d\eta$) as a function of $\eta$ in central $d$$+$Au collisions at the same energies. We find that in $d$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=$200 GeV the $v_2$ scales with $d{N}_{\mathrm{ch}}/d\eta$ over all $\eta$ in the PHENIX acceptance. At $\sqrt{s_{{}_{NN}}}=$62.4, and 39 GeV, $v_2$ scales with $d{N}_{\mathrm{ch}}/d\eta$ at midrapidity and forward rapidity, but falls off at backward rapidity. This departure from the $d{N}_{\mathrm{ch}}/d\eta$ scaling may be a further indication of nonflow effects dominating at backward rapidity.

arXiv comment246 authors, 20 pages, 16 figures, 6 tables. v2 is version accepted for publication in Phys. Rev. C Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

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