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

Journal: Physical Review Letters
Published:
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.

Authors
L Adamczyk, J Adkins, G Agakishiev, M Aggarwal, Z Ahammed, N Ajitanand, I Alekseev, D Anderson, R Aoyama, A Aparin, D Arkhipkin, E Aschenauer, M Ashraf, A Attri, G Averichev, X Bai, V Bairathi, A Behera, R Bellwied, A Bhasin, A Bhati, P Bhattarai, J Bielcik, J Bielcikova, L Bland, I Bordyuzhin, J Bouchet, J Brandenburg, A Brandin, D Brown, I Bunzarov, J Butterworth, H Caines, M Calderón De La Barca Sánchez, J Campbell, D Cebra, I Chakaberia, P Chaloupka, Z Chang, N Chankova Bunzarova, A 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 Fedorisin, 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, A Hamed, A Harlenderova, J Harris, L He, 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 Lednicky, 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 Ljubicic, 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 Mustafa, Md 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 Roth, L Ruan, J Rusnak, O Rusnakova, 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 D Stanislaus, M Strikhanov, B Stringfellow, T Sugiura, M Sumbera, B Summa, Y Sun, X Sun, B Surrow, D Svirida, M Szelezniak, A Tang, Z Tang, A Taranenko, T Tarnowsky, A Tawfik, J Thäder, J Thomas, A Timmins, D Tlusty, 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 Vokal, 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-k Yoo, N Yu, H Zbroszczyk, W Zha, Z Zhang, X Zhang, J Zhang, S Zhang, J Zhang, Y Zhang, J Zhang, J Zhao, C Zhong, L Zhou, C Zhou, X Zhu, Z Zhu, M Zyzak