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Bassam Aboona, Jaroslav Adam, Joseph R. Adams, Geydar Agakishiev, Ishu Aggarwal, Madan Mohan Aggarwal, Zubayer Ahammed, A. Aitbaev, Igor G. Alekseev, Derek M. Anderson, Alexey Aparin, J. Atchison, Georgy S. Averichev, Vipul Bairathi, W. Baker, Jonathan Gonzalo Ball Cap, Kenneth Barish, Pratibha Bhagat, Anju Bhasin, Somadutta Bhatta, Igor G. Bordyuzhin, James D. Brandenburg, Andrei V. Brandin, Xiang-Zhou Cai, Helen Louise Caines, Manuel Calderón de la Barca Sánchez, Daniel A. Cebra, Jakub Češka, Irakli Chakaberia, B. K. Chan, Z. Chang, D. Chen, J. Chen, J. H. Chen, Z. Chen, J. Cheng, Y. Cheng, Subikash Choudhury, William Christie, X. Chu, Henry J. Crawford, G. Dale-Gau, A. Das, M. Daugherity, T. G. Dedovich, Ingo Martin Deppner, Anatoly A. Derevschikov, A. Dhamija, L. Di Carlo, Lidia Didenko, Prabhupada Dixit, X. Dong, James Lucus Drachenberg, Emilie Duckworth, James C. Dunlop, Jon M. Engelage, Geary Wareham Eppley, ShinIchi Esumi, Olga Y. Evdokimov, A. Ewigleben, Kjeld Oleg Eyser, Renee H. Fatemi, Salvatore Fazio, C. J. Feng, Yicheng Feng, Evan Finch, Yuri V. Fisyak, Fernando Antonio Flor, C. Fu, Frank Geurts, Navagyan Ghimire, Adam Gibson, Krishan Gopal, X. Gou, David P. Grosnick, Anik Gupta, Ahmed M. Hamed, Y. Han, Matthew D. Harasty, John W. Harris, Hannah Harrison, W. He, X. H. He, Y. He, C. Hu, Q. Hu, Y. Hu, H. Huang, Huan Zhong Huang, Shengli Huang, T. Huang, X. Huang, Y. Huang, Y. Huang, Thomas J. Humanic, D. Isenhower, M. Isshiki, William W. Jacobs, Ashish Jalotra, Chitrasen Jena, Yuanjing Ji, Jiangyong Jia, C. Jin, X. Ju, Eleanor G. Judd, Sonia Kabana, M. L. Kabir, Dmitry Kalinkin, K. Kang, David Kapukchyan, Kolja Kauder, Hongwei Ke, Declan Keane, Armen Kechechyan, Matthew Kelsey, B. Kimelman, A. Kiselev, Anders Garritt Knospe, H. S. Ko, L. M. Kočenda, A. A. Korobitsin, Peter Kravtsov, Lokesh Kumar, Shyam Kumar, R. Kunnawalkam Elayavalli, Roy Alphanso Lacey, Jeffery M. Landgraf, Alexei Lebedev, Richard Lednicky, J. H. Lee, Y. H. Leung, N. Lewis, C. Li, C. Li, W. Li, X. Li, Y. Li, Y. Li, Z. Li, X. Liang, Y. Liang, T. Lin, C. Liu, F. Liu, H. Liu, H. Liu, L. Liu, T. Liu, X. Liu, Y. Liu, Z. Liu, Tonko A. Ljubicic, William Joseph Llope, O. Lomicky, Ronald S. Longacre, E. Loyd, T. Lu, N. S. Lukow, X. F. Luo, V. B. Luong, L. Ma, R. Ma, Yu-Gang Ma, Niseem Magdy Abdelwahab Abdelrahman, Dukhishyam Mallick, Spyridon Margetis, Howard S. Matis, Joel Anthony Mazer, Grant McNamara, K. Mi, Nikolai G. Minaev, Bedangadas Mohanty, Isaac A. Mooney, Dmitry A. Morozov, A. Mudrokh, M. I. Nagy, A. S. Nain, J. D. Nam, Md. Nasim, D. Neff, John M. Nelson, Daniel B. Nemes, M. Nie, Grigory A. Nigmatkulov, Takafumi Niida, R. Nishitani, Larisa V. Nogach, Toshihiro Nonaka, A. S. Nunes, Grazyna Janina Odyniec, Akio Ogawa, Saehanseul Oh, Vitaly A. Okorokov, K. Okubo, Brian S. Page, Robert Pak, Jinjin Pan, Ashish Pandav, Ashutosh Kumar Pandey, Yuri Panebratsev, T. Pani, P. Parfenov, A. Paul, Chris Perkins, B. R. Pokhrel, Matthew Posik, Tristan Protzman, Navneet Kumar Pruthi, Jörn H. Putschke, Z. Qin, H. Qiu, Amilkar Quintero, Cameron Racz, Sooraj Krishnan Radhakrishnan, N. Raha, Robert L. Ray, Hans Georg Ritter, C. W. Robertson, O. V. Rogachevsky, M. A. Rosales Aguilar, D. Roy, L. Ruan, A. K. Sahoo, Nihar Ranjan Sahoo, H. Sako, Sevil Salur, E. Samigullin, Susumu Sato, William B. Schmidke, Norbert Schmitz, Janet Elizabeth Seger, Richard Seto, Peter Seyboth, N. Shah, Ehtiram Shahaliev, Prashanth V. Shanmuganathan, M. Shao, T. Shao, M. Sharma, Natasha Sharma, R. Sharma, S. R. Sharma, Ashik Ikbal Sheikh, D. Y. Shen, K. Shen, Shusu Shi, Y. Shi, Q. Y. Shou, F. Si, J. Singh, Subhash Singha, P. Sinha, Michael J. Skoby, Yannick Söhngen, Y. Song, B. Srivastava, T. D. Shirvel Stanislaus, David J. Stewart, Michail Nikolaevič Strichanov, Blair Stringfellow, Y. Su, C. Sun, X. Sun, Y. Sun, Y. Sun, Bernd Surrow, Dmitry N. Svirida, Zachary W. Sweger, A. Tamis, Aihong Tang, Z. Tang, Arkadiy Taranenko, Terence J. Tarnowsky, James H. Thomas, David Tlusty, Takahito Todoroki, M. V. Tokarev, C. A. Tomkiel, Stephen Trentalange, Robert E. Tribble, Prithwish Tribedy, Oleg D. Tsai, C. Y. Tsang, Zhoudunming Tu, Thomas Ullrich, David G. Underwood, Isaac Upsal, Gene Van Buren, Alexander Nikolaevich Vasiliev, Veronica Verkest, Flemming Videbæk, Stanislav Vokal, Sergei Voloshin, F. Wang, G. Wang, J. S. Wang, X. Wang, Y. Wang, Y. Wang, Y. Wang, Z. Wang, Jason C. Webb, Philipp Weidenkaff, Gary D. Westfall, Howard Wieman, G. Wilks, Scott W. Wissink, J. Wu, J. Wu, Xiao Wu, Y. Wu, B. Xi, Z. G. Xiao, W. Xie, H. Xu, N. Xu, Q. H. Xu, Y. Xu, Y. Xu, Z. Xu, Z. Xu, G. Yan, Z. Yan, C. Yang, Q. Yang, S. Yang, Y. Yang, Z. Ye, Z. Ye, L. Yi, K. Yip, Y. Yu, W. Zha, C. Zhang, D. Zhang, J. Zhang, S. Zhang, X. Zhang, Y. Zhang, Y. Zhang, Y. Zhang, Z. J. Zhang, Z. Zhang, Z. Zhang, F. Zhao, J. Zhao, M. Zhao, C. Zhou, J. Zhou, S. Zhou, Y. Zhou, X. Zhu, Maria Katarzyna Żurek, Maksym Zyzak

• We report here the first observation of directed flow (v1) of the hypernuclei 3ΛH and 4ΛH in mid-central Au+Au collisions at sNN−−−√ = 3 GeV at RHIC. These data are taken as part of the beam energy scan program carried out by the STAR experiment. From 165 × 106 events in 5%-40% centrality, about 8400 3ΛH and 5200 4ΛH candidates are reconstructed through two- and three-body decay channels. We observe that these hypernuclei exhibit significant directed flow. Comparing to that of light nuclei, it is found that the midrapidity v1 slopes of 3ΛH and 4ΛH follow baryon number scaling, implying that the coalescence is the dominant mechanism for these hypernuclei production in such collisions.