Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-12-07
Phys.Lett. B477 (2000) 51-58
Physics
Nuclear Physics
Nuclear Theory
Revised Version, 7 pages, Latex, 6 Postscript figures included. Submitted to Physics Letters B
Scientific paper
10.1016/S0370-2693(00)00181-7
The methods currently used to measure collective flow in nucleus--nucleus collisions assume that the only azimuthal correlations between particles are those arising from their correlation with the reaction plane. However, quantum HBT correlations also produce short range azimuthal correlations between identical particles. This creates apparent azimuthal anisotropies of a few percent when pions are used to estimate the direction of the reaction plane. These should not be misinterpreted as originating from collective flow. In particular, we show that the peculiar behaviour of the directed and elliptic flow of pions observed by NA49 at low p_T can be entirely understood in terms of HBT correlations. Such correlations also produce apparent higher Fourier harmonics (of order n larger than 3) of the azimuthal distribution, with magnitudes of the order of 1%, which should be looked for in the data.
Borghini Nicolas
Dinh Mai
Ollitrault Jean-Yves
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