May 13 – 19, 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

New measures of longitudinal decorrelation of harmonic flow

May 15, 2018, 4:00 PM
Sala Perla, 1st Floor (Palazzo del Casinò)

Sala Perla, 1st Floor

Palazzo del Casinò

Parallel Talk Correlations and fluctuations Correlations and fluctuations


Piotr Bozek (AGH University of Science and Technology)


Longitudinal harmonic flow decorrelation (the "torque" effect [1,2]) is a sensitive probe of the early dynamics of ultra-relativistic nuclear collisions. We propose new decorrelation measures of flow magnitude and event-plane angles and apply them to Pb+Pb collisions at the LHC, modeled via event-by-event hydrodynamic simulations. The basic purpose is to verify a generic feature, namely, that the events with a higher flow magnitude decorrelate significantly less in the event-plane angle, compared to the events with a lower flow magnitude. We find a hierarchy between various flow decorrelation measures and confirm specific factorization relations. The model results are in qualitative agreement with the experimental data from the ATLAS and CMS Collaborations. The proposed generalization of the flow decorrelation measures, with weights involving higher powers of the flow magnitude, can be directly tested in future experimental analyses.

[1] P. Bozek, W. Broniowski, J. Moreira, Phys.Rev. C83 (2011) 034911
[2] P. Bozek, W. Broniowski, arXiv:1711.03325 [nucl-th]

Content type Theory
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