Speaker
LongGang Pang
(Lawrence Berkeley National Laboratory)
Description
The decorrelation of 2nd and 3rd order anisotropic flow along
longitudinal direction with large pseudorapidity η gap is investigated in
event-by-event (3+1)D ideal hydrodynamics with fluctuating initial
conditions from A MultiPhase Transport (AMPT) model. The agreement
between our results and CMS data for all available centralities in Pb+Pb
collisions at LHC suggests that the string model used in Pythia and
Hijing captures most features of the initial state fluctuations along
longitudinal direction.The predictions for Au+Au collisions at RHIC are
provided and give a much stronger longitudinal decorrelation, indicating
larger fluctuations along the pseudorapidity direction for lower energy
collisions. Further detailed studies show that the decorrelation of final
charged hadrons in momentum space comes from initial state decorrelation
in space, while the hydrodynamic evolution is important to transfer the
decorrelation in coordinate space to momentum space. We also demonstrate
that this breakdown of the flow factorization is an important ingredient
towards understanding the longitudinal structure in the initial state of
high energy heavy ion collisions.
Author
Pasi Huovinen
(Goethe-Universität)
Co-authors
Hannah Petersen
Harri Niemi
(University of Jyväskylä)
Iurii Karpenko
(Frankfurt Institute for Advanced Studies)
LongGang Pang
(Lawrence Berkeley National Laboratory)
Dr
Victor Roy
(J W Goethe University, Frankfurt am Main, Germany)
