Measurement of higher order flow harmonics in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV by CMS

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Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Board: 31
Poster Global and collective dynamics


Collaboration CMS (UCLouvain)


Collective flow is an important probe of the earliest stages in the expansion of the hot and dense matter created in relativistic heavy-ion collisions. Higher harmonics of the azimuthal distribution of emitted particles, in particular $v_3$ and $v_4$, complement $v_2$ measurements in elucidating the dynamical evolution of the bulk medium and providing constraints on its transport properties. With its large acceptance and broad rapidity coverage, the CMS detector is ideally suited to provide detailed analyses of higher order harmonic flow at the LHC. Measurements of $v_n$ (n = 3 to n = 6) in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV using the cumulant and Lee-Yang zeros methods will be presented as a function of $p_T$ and centrality. The scaling of the higher order flow harmonics with initial participant eccentricity and the ratios of the flow harmonics, such as $v_4$/$v_{2}^2$, will be explored and discussed.

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