Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-02-05
Phys.Rev. C66 (2002) 014901
Physics
Nuclear Physics
Nuclear Theory
RevTeX 4, 10 pages, 1 eps figure. Version accepted for publication in Phys Rev C
Scientific paper
10.1103/PhysRevC.66.014901
We present a general method for taking into account correlations due to momentum conservation in the analysis of anisotropic flow, either by using the two-particle correlation method or the standard flow vector method. In the latter, the correlation between the particle and the flow vector is either corrected through a redefinition (shift) of the flow vector, or subtracted explicitly from the observed flow coefficient. In addition, momentum conservation contributes to the reaction plane resolution. Momentum conservation mostly affects the first harmonic in azimuthal distributions, i.e., directed flow. It also modifies higher harmonics, for instance elliptic flow, when they are measured with respect to a first harmonic event plane such as one determined with the standard transverse momentum method. Our method is illustrated by application to NA49 data on pion directed flow.
Borghini Nicolas
Dinh Phuong Mai
Ollitrault Jean-Yves
Poskanzer Arthur M.
Voloshin Sergei A.
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