D Meson Elliptic Flow in Noncentral Pb-Pb Collisions at sNN=2.76 TeV
B. I. Abeleva, J. Adamb, D. Adamovác, Andrew Marshall Adared, M. M. Aggarwale, G. Aglieri Rinellaf, M. Agnellog h i, Andras Gabor Agocsj, A. Agostinellik, Z. Ahammedl, Naseem Saud Ahmadm, A. Ahmad Masoodim, Ijaz Ahmedn, S. U. Ahno, S. U. Ahno, I. Aimoh i p q, M. Ajazn, A. Akindinovr, D. Aleksandrovs, B. Alessandroi, D. Alexandret, A. Aliciu v w, A. Alkinx, J. Almey, T. Altz, Valerio Altiniaa, S. Altinpinarab, I. Altsybeevac, C. Andreiad, A. Andronicae and 951 others
- aLawrence Livermore National Laboratory, Livermore, California, USA
- bFaculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Prague, Czech Republic
- cNuclear Physics Institute, Academy of Sciences of the Czech Republic, Řež u Prahy, Czech Republic
- dYale University, New Haven, Connecticut, USA
- ePhysics Department, Panjab University, Chandigarh, India
- fEuropean Organization for Nuclear Research (CERN), Geneva, Switzerland
- gSezione INFN, Turin, Italy and Politecnico di Torino, Turin, Italy
- hPolitecnico di Torino, Turin, Italy
- iSezione INFN, Turin, Italy
- jWigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary
- kDipartimento di Fisica e Astronomia dell'Università and Sezione INFN, Bologna, Italy
- lVariable Energy Cyclotron Centre, Kolkata, India
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Abstract
Azimuthally anisotropic distributions of ${D}^{0}$, ${D}^{+}$, and ${D}^{*+}$ mesons were studied in the central rapidity region ($|y|<0.8$) in Pb-Pb collisions at a center-of-mass energy $\sqrt{{s}_{\mathrm{NN}}}=2.76\text{ }\text{ }\mathrm{TeV}$ per nucleon-nucleon collision, with the ALICE detector at the LHC. The second Fourier coefficient ${v}_{2}$ (commonly denoted elliptic flow) was measured in the centrality class 30%--50% as a function of the $D$ meson transverse momentum ${p}_{T}$, in the range $2--16\text{ }\text{ }\mathrm{GeV}/c$. The measured ${v}_{2}$ of $D$ mesons is comparable in magnitude to that of light-flavor hadrons. It is positive in the range $2<{p}_{T}<6\text{ }\text{ }\mathrm{GeV}/c$ with $5.7\ensuremath{\sigma}$ significance, based on the combination of statistical and systematic uncertainties.