New method for measuring longitudinal fuctuations and directed flow in ultrarelativistic heavy ion reactions

Details New method for measuring longitudinal fuctuations and directed flow in ultrarelativistic heavy ion reactions New method for measuring longitudinal fuctuations and directed flow in ultrarelativistic heavy ion reactions

2012-04-26

arxiv.org/abs/1204.5885v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 2 figures

Scientific paper

It has been shown in recent ALICE@LHC measurements that the odd flow harmonics, in particular a directed flow, v1, occurred to be weak and dominated by random fluctuations. In this work we propose a new method, which makes the measurements more sensitive to the flow patterns showing global collective symmetries. We demonstrate how the longitudinal center of mass rapidity fluctuations can be identified, and then the collective flow analysis can be performed in the event-by-event center of mass frame. Such a method can be very effective in separating the flow patterns originating from random fluctuations, and the flow patterns originating from the global symmetry of the initial state.

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