Measurement of D⁰ Azimuthal Anisotropy at Midrapidity in Au + Au Collisions at √s_NN = 200 GeV

Authors

• L. Adamczyk, AGH University of Science and Technology, Poland
• James K. Adkins, University of KentuckyFollow
• G. Agakishiev, Joint Institute for Nuclear Research, Russia
• M. M. Aggarwal, Panjab University, India
• Z. Ahammed, Variable Energy Cyclotron Centre, India
• N. N. Ajitanand, State University of New York - Stony Brook
• I. Alekseev, Alikhanov Institute for Theoretical and Experimental Physics, Russia
• D. M. Anderson, Texas A&M University
• R. Aoyama, University of Tsukuba, Japan
• A. Aparin, Joint Institute for Nuclear Research, Russia
• D. Arkhipkin, Brookhaven National Laboratory
• E. C. Aschenauer, Brookhaven National Laboratory
• M. U. Ashraf, Tsinghua University, China
• A. Attri, Panjab University, India
• G. S. Averichev, Joint Institute for Nuclear Research, Russia
• X. Bai, Central China Normal University, China
• V. Bairathi, National Institute of Science Education and Research, India
• A. Behera, State University of New York - Stony Brook
• R. Bellwied, University of Houston
• A. Bhasin, University of Jammu, India
• A. K. Bhati, Panjab University, India
• P. Bhattarai, University of Texas at Austin
• J. Bielcik, Czech Technical University in Prague, Czech Republic
• J. Bielcikova, Nuclear Physics Institute AS CR, Czech Republic
• L. C. Bland, Brookhaven National Laboratory
• I. G. Bordyuzhin, Alikhanov Institute for Theoretical and Experimental Physics, Russia
• J. Bouchet, Kent State University
• J. D. Brandenburg, Rice University
• A. V. Brandin, National Research Nuclear University MEPhI, Russia
• D. Brown, Lehigh University
• Renee H. Fatemi, University of KentuckyFollow
• Suvarna Ramachandran, University of KentuckyFollow

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 √s_NN = 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 (p_T) of less than 4  GeV/c. The D⁰ v₂ as a function of transverse kinetic energy (m_T − m₀, where m_T = √p²_T + m²₀) 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 D⁰ v₂ result and our previously published results for the D⁰ nuclear modification factor.

Document Type

Article

Publication Date

5-26-2017

Notes/Citation Information

Published in Physical Review Letters, v. 118, issue 21, 212301, p. 1-7.

© 2017 American Physical Society

The copyright holder has granted permission for posting the article here.

Due to the large number of authors, only the first 30 and the authors affiliated with the University of Kentucky are listed in the author section above. For the complete list of authors, please download this article or visit: https://doi.org/10.1103/PhysRevLett.118.212301

This group of authors is collectively known as the STAR Collaboration.

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevLett.118.212301

Funding Information

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.

Repository Citation

Adamczyk, L.; Adkins, James K.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Ajitanand, N. N.; Alekseev, I.; Anderson, D. M.; Aoyama, R.; Aparin, A.; Arkhipkin, D.; Aschenauer, E. C.; Ashraf, M. U.; Attri, A.; Averichev, G. S.; Bai, X.; Bairathi, V.; Behera, A.; Bellwied, R.; Bhasin, A.; Bhati, A. K.; Bhattarai, P.; Bielcik, J.; Bielcikova, J.; Bland, L. C.; Bordyuzhin, I. G.; Bouchet, J.; Brandenburg, J. D.; Brandin, A. V.; Brown, D.; Fatemi, Renee H.; and Ramachandran, Suvarna, "Measurement of D⁰ Azimuthal Anisotropy at Midrapidity in Au + Au Collisions at √s_NN = 200 GeV" (2017). Physics and Astronomy Faculty Publications. 545.
https://uknowledge.uky.edu/physastron_facpub/545