First Observation of the Directed Flow of D^{0} and D^{0}[over ¯] in Au+Au Collisions at sqrt[s_{NN}]=200  GeV.

Journal: Physical Review Letters
Published:
Abstract

We report the first measurement of rapidity-odd directed flow (v_{1}) for D^{0} and D^{0}[over ¯] mesons at midrapidity (|y|<0.8) in Au+Au collisions at sqrt[s_{NN}]=200  GeV using the STAR detector at the Relativistic Heavy Ion Collider. In 10-80% Au+Au collisions, the slope of the v_{1} rapidity dependence (dv_{1}/dy), averaged over D^{0} and D^{0}[over ¯] mesons, is -0.080±0.017(stat)±0.016(syst) for transverse momentum p_{T} above 1.5  GeV/c. The absolute value of D^{0} meson dv_{1}/dy is about 25 times larger than that for charged kaons, with 3.4σ significance. These data give a unique insight into the initial tilt of the produced matter, and offer constraints on the geometric and transport parameters of the hot QCD medium created in relativistic heavy-ion collisions.

Authors
J Adam, L Adamczyk, J Adams, J Adkins, G Agakishiev, M Aggarwal, Z Ahammed, I Alekseev, D Anderson, R Aoyama, A Aparin, E Aschenauer, M Ashraf, F Atetalla, A Attri, G Averichev, V Bairathi, K Barish, A Bassill, A Behera, R Bellwied, A Bhasin, A Bhati, J Bielcik, J Bielcikova, L Bland, I Bordyuzhin, J Brandenburg, A Brandin, J Bryslawskyj, I Bunzarov, J Butterworth, H Caines, M Calderón De La Barca Sánchez, D Cebra, I Chakaberia, P Chaloupka, B Chan, F-h Chang, Z Chang, N Chankova Bunzarova, A Chatterjee, S Chattopadhyay, J Chen, X Chen, J Cheng, M Cherney, W Christie, G Contin, H Crawford, M Csanád, S Das, T Dedovich, I Deppner, A Derevschikov, L Didenko, C Dilks, X Dong, J Drachenberg, J Dunlop, T Edmonds, N Elsey, J Engelage, G Eppley, R Esha, S Esumi, O Evdokimov, J Ewigleben, O Eyser, R Fatemi, S Fazio, P Federic, J Fedorisin, Y Feng, P Filip, E Finch, Y Fisyak, L Fulek, C Gagliardi, T Galatyuk, F Geurts, A Gibson, K Gopal, L Greiner, D Grosnick, A Gupta, W Guryn, A Hamad, A Hamed, J Harris, L He, S Heppelmann, N Herrmann, L Holub, Y Hong, S Horvat, B Huang, H Huang, S Huang, T Huang, X Huang, T Humanic, P Huo, G Igo, W Jacobs, C Jena, A Jentsch, Y Ji, J Jia, K Jiang, S Jowzaee, X Ju, E Judd, S Kabana, S Kagamaster, D Kalinkin, K Kang, D Kapukchyan, K Kauder, H Ke, D Keane, A Kechechyan, M Kelsey, Y Khyzhniak, D Kikoła, C Kim, T Kinghorn, I Kisel, A Kisiel, M Kocan, L Kochenda, L Kosarzewski, L Kramarik, P Kravtsov, K Krueger, N Kulathunga Mudiyanselage, L Kumar, R Kunnawalkam Elayavalli, J Kwasizur, R Lacey, J Landgraf, J Lauret, A Lebedev, R Lednicky, J Lee, C Li, W Li, W Li, X Li, Y Li, Y Liang, R Licenik, T Lin, A Lipiec, M Lisa, F Liu, H Liu, P Liu, P Liu, T Liu, X Liu, Y Liu, Z Liu, T Ljubicic, W Llope, M Lomnitz, R Longacre, S Luo, X Luo, G Ma, L Ma, R Ma, Y Ma, N Magdy, R Majka, D Mallick, S Margetis, C Markert, H Matis, O Matonoha, J Mazer, K Meehan, J Mei, N Minaev, S Mioduszewski, D Mishra, B Mohanty, M Mondal, I Mooney, Z Moravcova, D Morozov, Md Nasim, K Nayak, J Nelson, D Nemes, M Nie, G Nigmatkulov, T Niida, L Nogach, T Nonaka, G Odyniec, A Ogawa, S Oh, V Okorokov, B Page, R Pak, Y Panebratsev, B Pawlik, D Pawlowska, H Pei, C Perkins, R Pintér, J Pluta, J Porter, M Posik, N Pruthi, M Przybycien, J Putschke, A Quintero, S Radhakrishnan, S Ramachandran, R Ray, R Reed, H Ritter, J Roberts, O Rogachevskiy, J Romero, L Ruan, J Rusnak, O Rusnakova, N Sahoo, P Sahu, S Salur, J Sandweiss, J Schambach, W Schmidke, N Schmitz, B Schweid, F Seck, J Seger, M Sergeeva, R Seto, P Seyboth, N Shah, E Shahaliev, P Shanmuganathan, M Shao, F Shen, W Shen, S Shi, Q Shou, E Sichtermann, S Siejka, R Sikora, M Simko, J Singh, S Singha, D Smirnov, N Smirnov, W Solyst, P Sorensen, H Spinka, B Srivastava, T D Stanislaus, M Stefaniak, D Stewart, M Strikhanov, B Stringfellow, A Suaide, T Sugiura, M Sumbera, B Summa, X Sun, Y Sun, Y Sun, B Surrow, D Svirida, M Szelezniak, P Szymanski, A Tang, Z Tang, A Taranenko, T Tarnowsky, A Tawfik, J Thomas, A Timmins, D Tlusty, M Tokarev, C Tomkiel, S Trentalange, R Tribble, P Tribedy, S Tripathy, O Tsai, B Tu, Z Tu, T Ullrich, D Underwood, I Upsal, G Van Buren, J Vanek, A Vasiliev, I Vassiliev, F Videbæk, S Vokal, S Voloshin, F Wang, G Wang, P Wang, Y Wang, Y Wang, J Webb, L Wen, G Westfall, H Wieman, S Wissink, R Witt, Y Wu, Z Xiao, G Xie, W Xie, H Xu, N Xu, Q Xu, Y Xu, Z Xu, C Yang, Q Yang, S Yang, Y Yang, Z Yang, Z Ye, L Yi, K Yip, H Zbroszczyk, W Zha, D Zhang, L Zhang, S Zhang, X Zhang, Y Zhang, Z Zhang, J Zhao, C Zhong, C Zhou, X Zhu, Z Zhu, M Zurek, M Zyzak