Charge asymmetry dependence of elliptic and triangular flow in pPb and PbPb collisions at $\sqrt{s_{_{NN}}} = 5.02~\mathrm{TeV}$

Charge asymmetry dependence of elliptic and triangular flow in pPb and PbPb collisions at $\sqrt{s_{_{NN}}} = 5.02~\mathrm{TeV}$

CMS

Collaboration

2017

13 pages

Report number:

CMS-PAS-HIN-16-017

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

pdf

reference search2 citations

Citations per year

Abstract:

Charge dependent elliptic azimuthal anisotropy (

v_{\rm 2}

) in pPb and both

v_{\rm 2}

and triangular azimuthal anisotropy (

v_{\rm 3}

) in PbPb collisions are measured at

\sqrt{s_{_{NN}}} = 5.02~\mathrm{TeV}

with the CMS detector at the LHC. The normalized difference of

v_{\rm 2}

between positively and negatively charged particles, (

v_{\rm 2}^{-}-v_{\rm 2}^{+}

)/(

v_{\rm 2}^{-}+v_{\rm 2}^{+}

), shows a linear dependence with respect to the event-charged asymmetry

A_{\rm ch}

, with comparable slopes observed for pPb and PbPb collisions at similar multiplicities. In PbPb collisions, the slopes are found to be the same for the

v_{\rm 2}

and

v_{\rm 3}

coefficients within uncertainties. These observations pose a challenge to the hypothesis that the charge asymmetry dependence of

v_{\rm 2}

arises from a chiral magnetic wave. However, the results are in qualitative agreement with expectations based on local charge conservation.

Note:

Preliminary results

Data
charge: asymmetry
charge: conservation law
wave: magnetic
triangulation
angular distribution: anisotropy
slope
charge dependence
charge: chiral
charged particle

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Charge asymmetry dependence of elliptic and triangular flow in pPb and PbPb collisions at sNN=5.02 TeV\sqrt{s_{_{NN}}} = 5.02~\mathrm{TeV}sNN​​​=5.02 TeV

Citations per year

Charge asymmetry dependence of elliptic and triangular flow in pPb and PbPb collisions at $\sqrt{s_{_{NN}}} = 5.02~\mathrm{TeV}$