Using data from the second high-statistics lead–lead (PbPb) run of the LHC, which took place in 2011, the ALICE experiment is taking new directions in studying the interaction of charm quarks within strongly interacting matter at the high energy-density and temperature produced in these heavy-ion collisions. Following the observation of a large suppression of the production of charmed hadrons at high momentum (CERN Courier June 2012 p15), the collaboration is seeking further insight by quantifying the strength of this effect in different directions relative to the reaction plane, as well as by measuring the production of the charm-strange meson, Ds.
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article - ALICE from March 30, 2011
Flow is an interesting observable because it provides information on the equation of state and the transport properties of matter created in a heavy-ion collision. The azimuthal anisotropy in particle production is the clearest experimental signature of collective flow; it is caused by multiple interactions between the constituents of the created matter and the initial asymmetries in the spatial geometry of a non-central collision. The second Fourier coefficient of this azimuthal asymmetry is known as elliptic flow.

 

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