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Effects of HBT correlations on flow measurements
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Effects of HBT correlations on flow measurements
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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.
Forward citations
Cited by 2 Pith papers
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Explaining higher-order correlations between elliptic and triangular flow
Higher-order v2-v3 cumulants reduce to expressions fixed by the mean elliptic flow from nuclear overlap geometry.
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Explaining higher-order correlations between elliptic and triangular flow
Mixed harmonic cumulants of elliptic and triangular flow obey simple ratios set by reaction-plane elliptic flow, yielding new predictions for 10-particle cumulants.
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