27 September 2015 to 3 October 2015
Kobe, Fashion Mart, Japan
Japan timezone

Decorrelation of anisotropic flow along the longitudinal direction

29 Sept 2015, 11:10
20m
Exhibition Space 2-B

Exhibition Space 2-B

Contributed talk Collective Dynamics Collective Dynamics II

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.

Primary 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)

Presentation materials