BARC/PUB/2014/0926

 
 

Measurement of higher-order harmonic azimuthal anisotropy in PbPb collisions at √sNN=2.76 TeV

 
     
 
Author(s)

Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Abdulsalam, A.; Dutta, D.; Kailas, S.; Kumar, V.; Mohanty, A. K.; Pant, L. M.; Shukla, P.; Topkar, A.; and others
(NPD)

Source

Physical Review-C, 2014. Vol. 89 (4): Article no. 044906

ABSTRACT

Measurements are presented by the CMSCollaboration at the Large Hadron Collider (LHC) of the higher-order harmonic coefficients that describe the azimuthal anisotropy of charged particles emitted in √sNN = 2.76 TeV PbPb collisions. Expressed in terms of the Fourier components of the azimuthal distribution, the n = 3–6 harmonic coefficients are presented for charged particles as a function of their transverse momentum (0.3 < pT < 8.0 GeV/c), collision centrality (0%–70%), and pseudorapidity (|η| < 2.0). The data are analyzed using the event plane, multiparticle cumulant, and Lee-Yang zeros methods, which provide different sensitivities to initial-state fluctuations. Taken together with earlier LHC measurements of elliptic flow (n = 2), the results on higher-order harmonic coefficients develop a more complete picture of the collective motion in high-energy heavy-ion collisions and shed light on the properties of the produced medium.

 
 
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