Dihadron angular correlations in d + Au collisions at √sNN = 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 (Δη) on the near side (i.e. relative azimuth Δφ ~ 0). This correlated yield as a function of Δη appears to scale with the dominant, primarily jet-related, away-side (Δφ ~ π ) yield. The Fourier coefficients of the Δφ correlation, Vn = (cos nΔφ), have a strong Δη dependence. In addition, it is found that V1 is approximately inversely proportional to the mid-rapidity event multiplicity, while V2 is independent of it with similar magnitude in the forward (d-going) and backward (Au-going) directions.
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We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Offices of NP and HEP within the U.S. DOEOffice of Science, the U.S. NSF, the Sloan Foundation, the DFG cluster of excellence ‘Origin and Structure of the Universe’ of Germany, CNRS/IN2P3, STFC and EPSRC of the United Kingdom, FAPESP CNPq of Brazil, Ministry of Education and Science of the Russian Federation, NNSFC, CAS, MoST, and MoE of China, GA and MSMT of the Czech Republic, FOM and NWO of the Netherlands, DAE, DST, and CSIR of India, Polish Ministry of Science and Higher Education, Korea Research Foundation, Ministry of Science, Education and Sports of the Republic Of Croatia, Russian Ministry of Science and Technology, and RosAtom of Russia.
Adkins, James K.; Fatemi, Renee H.; Ramachandran, Suvarna; Adamczyk, L.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alekseev, I.; Alford, J.; Aparin, A.; Arkhipkin, D.; Aschenauer, E. C.; and Averichev, G. S., "Long-Range Pseudorapidity Dihadron Correlations in d + Au Collisions at √sNN = 200 GeV" (2015). Physics and Astronomy Faculty Publications. 352.