Abstract
We report the first measurement of the elliptic anisotropy (v2) of the charm meson D0 at midrapidity (|y|<1) in Au+Au collisions at sNN=200 GeV. The measurement was conducted by the STAR experiment at RHIC utilizing a new high-resolution silicon tracker. The measured D0 v2 in 0%-80% centrality Au+Au collisions can be described by a viscous hydrodynamic calculation for a transverse momentum (pT) of less than 4 GeV/c. The D0 v2 as a function of transverse kinetic energy (mT-m0, where mT=pT2+m02) 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 (2πTDs) in the range of ∼2-12, are able to simultaneously reproduce our D0 v2 result and our previously published results for the D0 nuclear modification factor.
Original language | English |
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Article number | 212301 |
Journal | Physical Review Letters |
Volume | 118 |
Issue number | 21 |
DOIs | |
State | Published - May 26 2017 |
Bibliographical note
Publisher Copyright:© 2017 American Physical Society.
Funding
We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science, the U.S. National Science Foundation, the Ministry of Education and Science of the Russian Federation, National Natural Science Foundation of China, Chinese Academy of Science, the Ministry of Science and Technology of China (973 Programme No. 2014CB845400) and the Chinese Ministry of Education, the National Research Foundation of Korea, GA and MSMT of the Czech Republic, Department of Atomic Energy and Department of Science and Technology of the Government of India; the National Science Centre of Poland, National Research Foundation, the Ministry of Science, Education and Sports of the Republic of Croatia, RosAtom of Russia and German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie (BMBF), and the Helmholtz Association.
Funders | Funder number |
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RHIC Operations Group | |
RosAtom of Russia and German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie | |
National Science Foundation Arctic Social Science Program | 1613939 |
National Science Foundation Arctic Social Science Program | |
Office of Science Programs | |
Institute for Nuclear Physics | |
National Research Foundation South African Research Chair | |
Department of Science and Technology, Ministry of Science and Technology, India | |
National Natural Science Foundation of P.R. China | |
Ministerstvo Školství, Mládeže a Tělovýchovy | |
Ministry of Education of the People's Republic of China | |
Bundesministerium für Bildung und Forschung | |
Chinese Academy of Sciences | |
Ministry of Science and Technology of the People's Republic of China | 2014CB845400 |
Ministry of Science and Technology of the People's Republic of China | |
Ministarstvo Obrazovanja, Znanosti i Sporta | |
Ministry for Education and Science of the Russian Federation | |
Narodowe Centrum Nauki | |
Max Delbrück Center for Molecular Medicine in the Helmholtz Association | |
Raincoast Conservation Foundation |
ASJC Scopus subject areas
- General Physics and Astronomy