We present measurements of second-order azimuthal anisotropy (υ2) at midrapidity (|y| < 1.0) for light nuclei d, t, 3He (for ⎷sNN = 200 GeV) in the STAR (Solenoidal Tracker at RHIC) experiment. The υ2 for these light nuclei produced in heavy-ion collisions is compared with those for p and p¯. We observe mass ordering in nuclei υ2 (pT) at low transverse momenta (pT < 2.0 GeV/c). We also find a centrality dependence of υ2 for d and d¯. The magnitude of υ2 for t and 3He agree within statistical errors. Light-nuclei υ2 are compared with predictions from a blast-wave model. Atomic mass number (A) scaling of light-nuclei υ2 (pT) seems to hold for pT/A < 1.5 GeV/c. Results on light-nuclei υ2 from a transport-plus-coalescence model are consistent with the experimental measurements.
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We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, the KISTI Center in Korea, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science, the U.S. NSF, the Ministry of Education and Science of the Russian Federation, NSFC, CAS, MoST and MoE of China, the National Research Foundation of Korea, NCKU (Taiwan), GA and MSMT of the Czech Republic, FIAS of Germany, DAE, DST, and UGC of India, the National Science Centre of Poland, National Research Foundation, the Ministry of Science, Education and Sports of the Republic of Croatia, and RosAtom of Russia. This work is supported by the DAE-BRNS project Grant No. 2010/21/15-BRNS/2026.
Adamczyk, L.; Adkins, James K.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alekseev, I.; Aparin, A.; Arkhipkin, D.; Aschenauer, E. C.; Attri, A.; Averichev, G. S.; Bai, X.; Bairathi, V.; Bellwied, R.; Bhasin, A.; Bhati, A. K.; Bhattarai, P.; Bielcik, J.; Bielcikova, J.; Bland, L. C.; Bordyuzhin, I. G.; Bouchet, J.; Brandenburg, J. D.; Brandin, A. V.; Bunzarov, I.; Butterworth, J.; Caines, H.; Calderón de la Barca Sánchez, M.; Campbell, J. M.; Cebra, D.; Fatemi, Renee H.; and Ramachandran, Suvarna, "Measurement of Elliptic Flow of Light Nuclei at √SNN = 200, 62.4, 39, 27, 19.6, 11.5, and 7.7 GeV at the BNL Relativistic Heavy Ion Collider" (2016). Physics and Astronomy Faculty Publications. 411.