Elsevier

Physics Letters B

Volume 773, 10 October 2017, Pages 68-80
Physics Letters B

Linear and non-linear flow mode in Pb–Pb collisions at sNN=2.76 TeV

https://doi.org/10.1016/j.physletb.2017.07.060Get rights and content
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Abstract

The second and the third order anisotropic flow, V2 and V3, are mostly determined by the corresponding initial spatial anisotropy coefficients, ε2 and ε3, in the initial density distribution. In addition to their dependence on the same order initial anisotropy coefficient, higher order anisotropic flow, Vn (n>3), can also have a significant contribution from lower order initial anisotropy coefficients, which leads to mode-coupling effects. In this Letter we investigate the linear and non-linear modes in higher order anisotropic flow Vn for n=4, 5, 6 with the ALICE detector at the Large Hadron Collider. The measurements are done for particles in the pseudorapidity range |η|<0.8 and the transverse momentum range 0.2<pT<5.0 GeV/c as a function of collision centrality. The results are compared with theoretical calculations and provide important constraints on the initial conditions, including initial spatial geometry and its fluctuations, as well as the ratio of the shear viscosity to entropy density of the produced system.

Cited by (0)

i

Deceased.

ii

Also at: Dipartimento DET del Politecnico di Torino, Turin, Italy.

iii

Also at: Georgia State University, Atlanta, Georgia, United States.

iv

Also at: M.V. Lomonosov Moscow State University, D.V. Skobeltsyn Institute of Nuclear, Physics, Moscow, Russia.

v

Also at: Department of Applied Physics, Aligarh Muslim University, Aligarh, India.

vi

Also at: Institute of Theoretical Physics, University of Wroclaw, Poland.

E-mail address: [email protected].