Long-range pseudorapidity dihadron correlations in d plus Au collisions at root S-NN=200 GeV

2015
Dihadron angular correlations in d + Au collisions at root S-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( Deltaeta) on the near side (i.e. relative azimuth Deltaphi similar to 0). This correlated yield as a function of Deltaeta appears to scale with the dominant, primarily jet-related, away-side ( Deltaphi similar to pi) yield. The Fourier coefficients of the Deltaphi correlation, V-n = , have a strong Deltaeta 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. (C) 2015 The Authors. Published by Elsevier B.V.
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