학술논문

Observation of Directed Flow of Hypernuclei $^3_{\Lambda}$H and $^4_{\Lambda}$H in $\sqrt{s_{\rm NN}}$ = 3 GeV Au+Au Collisions at RHIC
Document Type
Working Paper
Author
STAR CollaborationAboona, B. E.Adam, J.Adams, J. R.Agakishiev, G.Aggarwal, I.Aggarwal, M. M.Ahammed, Z.Aitbaev, A.Alekseev, I.Anderson, D. M.Aparin, A.Atchison, J.Averichev, G. S.Bairathi, V.Baker, W.Cap, J. G. BallBarish, K.Bhagat, P.Bhasin, A.Bhatta, S.Bordyuzhin, I. G.Brandenburg, J. D.Brandin, A. V.Cai, X. Z.Caines, H.Sánchez, M. Calderón de la BarcaCebra, D.Ceska, J.Chakaberia, I.Chan, B. K.Chang, Z.Chen, D.Chen, J.Chen, J. H.Chen, Z.Cheng, J.Cheng, Y.Choudhury, S.Christie, W.Chu, X.Crawford, H. J.Dale-Gau, G.Das, A.Daugherity, M.Dedovich, T. G.Deppner, I. M.Derevschikov, A. A.Dhamija, A.Di Carlo, L.Didenko, L.Dixit, P.Dong, X.Drachenberg, J. L.Duckworth, E.Dunlop, J. C.Engelage, J.Eppley, G.Esumi, S.Evdokimov, O.Ewigleben, A.Eyser, O.Fatemi, R.Fazio, S.Feng, C. J.Feng, Y.Finch, E.Fisyak, Y.Flor, F. A.Fu, C.Geurts, F.Ghimire, N.Gibson, A.Gopal, K.Gou, X.Grosnick, D.Gupta, A.Hamed, A.Han, Y.Harasty, M. D.Harris, J. W.Harrison, H.He, W.He, X. H.He, Y.Hu, C.Hu, Q.Hu, Y.Huang, H.Huang, H. Z.Huang, S. L.Huang, T.Huang, X.Huang, Y.Humanic, T. J.Isenhower, D.Isshiki, M.Jacobs, W. W.Jalotra, A.Jena, C.Ji, Y.Jia, J.Jin, C.Ju, X.Judd, E. G.Kabana, S.Kabir, M. L.Kalinkin, D.Kang, K.Kapukchyan, D.Kauder, K.Ke, H. W.Keane, D.Kechechyan, A.Kelsey, M.Kimelman, B.Kiselev, A.Knospe, A. G.Ko, H. S.Kochenda, L.Korobitsin, A. A.Kravtsov, P.Kumar, L.Kumar, S.Elayavalli, R. KunnawalkamLacey, R.Landgraf, J. M.Lebedev, A.Lednicky, R.Lee, J. H.Leung, Y. H.Lewis, N.Li, C.Li, W.Li, X.Li, Y.Li, Z.Liang, X.Liang, Y.Lin, T.Liu, C.Liu, F.Liu, H.Liu, L.Liu, T.Liu, X.Liu, Y.Liu, Z.Ljubicic, T.Llope, W. J.Lomicky, O.Longacre, R. S.Loyd, E.Lu, T.Lukow, N. S.Luo, X. F.Luong, V. B.Ma, L.Ma, R.Ma, Y. G.Magdy, N.Mallick, D.Margetis, S.Matis, H. S.Mazer, J. A.McNamara, G.Mi, K.Minaev, N. G.Mohanty, B.Mooney, I.Morozov, D. A.Mudrokh, A.Nagy, M. I.Nain, A. S.Nam, J. D.Nasim, Md.Neff, D.Nelson, J. M.Nemes, D. B.Nie, M.Nigmatkulov, G.Niida, T.Nishitani, R.Nogach, L. V.Nonaka, T.Nunes, A. S.Odyniec, G.Ogawa, A.Oh, S.Okorokov, V. A.Okubo, K.Page, B. S.Pak, R.Pan, J.Pandav, A.Pandey, A. K.Panebratsev, Y.Pani, T.Parfenov, P.Paul, A.Perkins, C.Pokhrel, B. R.Posik, M.Protzman, T.Pruthi, N. K.Putschke, J.Qin, Z.Qiu, H.Quintero, A.Racz, C.Radhakrishnan, S. K.Raha, N.Ray, R. L.Ritter, H. G.Robertson, C. W.Rogachevsky, O. V.Aguilar, M. A. RosalesRoy, D.Ruan, L.Sahoo, A. K.Sahoo, N. R.Sako, H.Salur, S.Samigullin, E.Sato, S.Schmidke, W. B.Schmitz, N.Seger, J.Seto, R.Seyboth, P.Shah, N.Shahaliev, E.Shanmuganathan, P. V.Shao, M.Shao, T.Sharma, M.Sharma, N.Sharma, R.Sharma, S. R.Sheikh, A. I.Shen, D. Y.Shen, K.Shi, S. S.Shi, Y.Shou, Q. Y.Si, F.Singh, J.Singha, S.Sinha, P.Skoby, M. J.Söhngen, Y.Song, Y.Srivastava, B.Stanislaus, T. D. S.Stewart, D. J.Strikhanov, M.Stringfellow, B.Su, Y.Sun, C.Sun, X.Sun, Y.Surrow, B.Svirida, D. N.Sweger, Z. W.Tamis, A.Tang, A. H.Tang, Z.Taranenko, A.Tarnowsky, T.Thomas, J. H.Tlusty, D.Todoroki, T.Tokarev, M. V.Tomkiel, C. A.Trentalange, S.Tribble, R. E.Tribedy, P.Tsai, O. D.Tsang, C. Y.Tu, Z.Ullrich, T.Underwood, D. G.Upsal, I.Van Buren, G.Vasiliev, A. N.Verkest, V.Videbæk, F.Vokal, S.Voloshin, S. A.Wang, F.Wang, G.Wang, J. S.Wang, X.Wang, Y.Wang, Z.Webb, J. C.Weidenkaff, P. C.Westfall, G. D.Wieman, H.Wilks, G.Wissink, S. W.Wu, J.Wu, X.Wu, Y.Xi, B.Xiao, Z. G.Xie, W.Xu, H.Xu, N.Xu, Q. H.Xu, Y.Xu, Z.Yan, G.Yan, Z.Yang, C.Yang, Q.Yang, S.Yang, Y.Ye, Z.Yi, L.Yip, K.Yu, Y.Zha, W.Zhang, C.Zhang, D.Zhang, J.Zhang, S.Zhang, X.Zhang, Y.Zhang, Z. J.Zhang, Z.Zhao, F.Zhao, J.Zhao, M.Zhou, C.Zhou, J.Zhou, S.Zhou, Y.Zhu, X.Zurek, M.Zyzak, M.
Source
Subject
Nuclear Experiment
Language
Abstract
We report here the first observation of directed flow ($v_1$) of the hypernuclei $^3_{\Lambda}$H and $^4_{\Lambda}$H in mid-central Au+Au collisions at $\sqrt{s_{\rm NN}}$ = 3 GeV at RHIC. These data are taken as part of the beam energy scan program carried out by the STAR experiment. From 165 $\times$ 10$^{6}$ events in 5%-40% centrality, about 8400 $^3_{\Lambda}$H and 5200 $^4_{\Lambda}$H 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 $v_1$ slopes of $^3_{\Lambda}$H and $^4_{\Lambda}$H follow baryon number scaling, implying that the coalescence is the dominant mechanism for these hypernuclei production in such collisions.
Comment: 5pages, 4 figures. Supplemental material: 6 pages, 5 figures