Measurement of D^{0} Azimuthal Anisotropy at Midrapidity in Au+Au Collisions at sqrt[s_{NN}]=200 GeV.

/ Authors

L. Adamczyk, J. K. Adkins, G. Agakishiev, M. Aggarwal, Z. Ahammed, N. Ajitanand, I. Alekseev, D. Anderson, R. Aoyama, A. Aparin

and 339 more authors

D. Arkhipkin, E. Aschenauer, M. U. Ashraf, A. Attri, G. S. Averichev, X. Bai, V. Bairathi, A. Behera, R. Bellwied, A. Bhasin, A. Bhati, P. Bhattarai, J. Bielcik, J. Bielčíková, L. Bland, I. Bordyuzhin, J. Bouchet, J. Brandenburg, A. Brandin, D. Brown, I. Bunzarov, J. Butterworth, H. Caines, M. Calderon De La Barca Sanchez, J. Campbell, D. Cebra, I. Chakaberia, P. Chaloupka, Z. Chang, N. Chankova-Bunzarova, Sirshendu Chatterjee, S. Chattopadhyay, X. Chen, J. Chen, X. Chen, J. Cheng, M. Cherney, W. Christie, G. Contin, H. Crawford, S. Das, L. De Silva, R. Debbe, T. Dedovich, J. Deng, A. Derevschikov, L. Didenko, C. Dilks, X. Dong, J. Drachenberg, J. Draper, L. Dunkelberger, J. Dunlop, L. Efimov, N. Elsey, J. Engelage, G. Eppley, R. Esha, S. Esumi, O. Evdokimov, J. Ewigleben, O. Eyser, R. Fatemi, S. Fazio, P. Federic, P. Federicova, J. Fedorišin, Z. Feng, P. Filip, E. Finch, Y. Fisyak, C. Flores, L. Fulek, C. Gagliardi, D. Garand, F. Geurts, A. Gibson, M. Girard, L. Greiner, D. Grosnick, D. Gunarathne, Y. Guo, A. Gupta, S. Gupta, W. Guryn, A. Hamad, Ahmed M. Hamed, A. Harlenderova, J. Harris, L. He, S. Heppelmann, S. Heppelmann, A. Hirsch, G. Hoffmann, S. Horvat, T. Huang, B. Huang, X. Huang, H. Huang, T. Humanic, P. Huo, G. Igo, W. Jacobs, A. Jentsch, J. Jia, K. Jiang, S. Jowzaee, E. Judd, S. Kabana, D. Kalinkin, K. Kang, K. Kauder, H. Ke, D. Keane, A. Kechechyan, Z. Khan, D. Kikoła, I. Kisel, A. Kisiel, L. Kochenda, M. Kocmanek, T. Kollegger, L. Kosarzewski, A. Kraishan, P. Kravtsov, K. Krueger, N. Kulathunga, L. Kumar, J. Kvapil, J. Kwasizur, R. Lacey, J. Landgraf, K. Landry, J. Lauret, A. Lebedev, R. Lednický, J. Lee, X. Li, C. Li, W. Li, Y. Li, J. Lidrych, T. Lin, M. Lisa, H. Liu, P. Liu, Y. Liu, F. Liu, T. Ljubičić, W. Llope, M. Lomnitz, R. Longacre, S. Luo, X. Luo, G. Ma, L. Ma, Y. Ma, R. Ma, N. Magdy, R. Majka, D. Mallick, S. Margetis, C. Markert, H. Matis, K. Meehan, J. Mei, Z. Miller, N. Minaev, S. Mioduszewski, D. Mishra, S. Mizuno, B. Mohanty, M. Mondal, D. Morozov, M. K. Mustafa, M. Nasim, T. Nayak, J. Nelson, M. Nie, G. Nigmatkulov, T. Niida, L. Nogach, T. Nonaka, S. Nurushev, G. Odyniec, A. Ogawa, K. Oh, V. Okorokov, D. Olvitt, B. Page, R. Pak, Y. Pandit, Y. Panebratsev, B. Pawlik, H. Pei, C. Perkins, P. Pile, J. Pluta, K. Poniatowska, J. Porter, M. Posik, A. Poskanzer, N. Pruthi, M. Przybycien, J. Putschke, H. Qiu, A. Quintero, S. Ramachandran, R. Ray, R. Reed, M. Rehbein, H. Ritter, J. Roberts, O. Rogachevskiy, J. Romero, J. D. Roth, L. Ruan, J. Rusnak, O. Rusňáková, N. Sahoo, P. Sahu, S. Salur, J. Sandweiss, M. Saur, J. Schambach, A. Schmah, W. Schmidke, N. Schmitz, B. Schweid, J. Seger, M. Sergeeva, P. Seyboth, N. Shah, E. Shahaliev, P. Shanmuganathan, M. Shao, A. Sharma, M. Sharma, W. Shen, Z. Shi, S. Shi, Q. Shou, E. Sichtermann, R. Sikora, M. Simko, S. Singha, M. Skoby, N. Smirnov, D. Smirnov, W. Solyst, L. Song, P. Sorensen, H. Spinka, B. Srivastava, T. Stanislaus, M. Strikhanov, B. Stringfellow, T. Sugiura, M. Šumbera, B. Summa, Y. Sun, X. Sun, X. Sun, B. Surrow, D. Svirida, M. Szelezniak, A. Tang, Z. Tang, A. Taranenko, T. Tarnowsky, Abdel Nasser Tawfik, J. Thäder, J. Thomas, A. Timmins, D. Tlustý, T. Todoroki, M. Tokarev, S. Trentalange, R. Tribble, P. Tribedy, S. Tripathy, B. Trzeciak, O. Tsai, T. Ullrich, D. Underwood, I. Upsal, G. Van Buren, G. van Nieuwenhuizen, A. Vasiliev, F. Videbæk, S. Vokál, S. Voloshin, A. Vossen, G. Wang, Y. Wang, F. Wang, Y. Wang, J. Webb, G. Webb, L. Wen, G. Westfall, H. Wieman, S. Wissink, R. Witt, Y. Wu, Z. Xiao, W. Xie, G. Xie, J. Xu, N. Xu, Q. Xu, Y. Xu, Z. Xu, Y. Yang, Q. Yang, C. Yang, S. Yang, Z. Ye, L. Yi, K. Yip, I. Yoo, N. Yu, H. Zbroszczyk, W. Zha, Z. Zhang, X. Zhang, J. Zhang, S. Zhang, J. Zhang, Y. Zhang, J. Zhang, S. Zhang, J. Zhao, C. Zhong, Long Zhou, C. Zhou, X. Zhu, Z. Zhu, M. Zyzak

/ Abstract

We report the first measurement of the elliptic anisotropy (v_{2}) of the charm meson D^{0} at midrapidity (|y|<1) in Au+Au collisions at sqrt[s_{NN}]=200 GeV. The measurement was conducted by the STAR experiment at RHIC utilizing a new high-resolution silicon tracker. The measured D^{0} v_{2} in 0%-80% centrality Au+Au collisions can be described by a viscous hydrodynamic calculation for a transverse momentum (p_{T}) of less than 4 GeV/c. The D^{0} v_{2} as a function of transverse kinetic energy (m_{T}-m_{0}, where m_{T}=sqrt[p_{T}^{2}+m_{0}^{2}]) is consistent with that of light mesons in 10%-40% centrality Au+Au collisions. These results suggest that charm quarks have achieved local thermal equilibrium with the medium created in such collisions. Several theoretical models, with the temperature-dependent, dimensionless charm spatial diffusion coefficient (2πTD_{s}) in the range of ∼2-12, are able to simultaneously reproduce our D^{0} v_{2} result and our previously published results for the D^{0} nuclear modification factor.

Journal: Physical review letters

DOI: 10.1103/PhysRevLett.118.212301