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

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 posi...

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Detalles Bibliográficos
Autor principal: CMS Collaboration
Publicado: 2017
Materias:
Acceso en línea:http://cds.cern.ch/record/2244682
Descripción
Sumario: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.