Long-range pseudorapidity dihadron correlations in $d$+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV

Abstract

Dihadron angular correlations in $d$+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV are reported as a function of the measured zero-degree calorimeter neutral energy and the forward charged hadron multiplicity in the Au-beam direction. A finite correlated yield is observed at large relative pseudorapidity ($\Delta \eta$) on the near side (i.e. relative azimuth $\Delta \varphi \sim 0$). This correlated yield as a function of $\Delta \eta$ appears to scale with the dominant, primarily jet-related, away-side ($\Delta \varphi \sim \pi$) yield. The Fourier coefficients of the $\Delta \varphi$ correlation, $V_n=⟨\cos n\Delta \varphi ⟩$, have a strong $\Delta \eta$ dependence. In addition, it is found that $V_1$ is approximately inversely proportional to the mid-rapidity event multiplicity, while $V_2$ is independent of it with similar magnitude in the forward ($d$-going) and backward (Au-going) directions.

8 pages, 4 figures

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