21 research outputs found
Effects of momentum conservation on the analysis of anisotropic flow
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.Comment: RevTeX 4, 10 pages, 1 eps figure. Version accepted for publication in
Phys Rev
Analysis of directed flow from elliptic flow
Borghini N, Dinh PM, Ollitrault JY. Analysis of directed flow from elliptic flow. Physical Review C. 2002;66(1): 014905.The directed flow of particles produced in ultrarelativistic heavy ion collisions at the CERN Super Proton Synchrotron and the Brookhaven Relativistic Heavy Ion Collider is so small that currently available methods of analysis are at the border of applicability. Standard two-particle and flow-vector methods are biased by large nonflow correlations. On the other hand, cumulants of four-particle correlations, which are free from this bias, are plagued by large statistical errors. Here, we present a new method based on three-particle correlations, which uses the property that elliptic flow is large at these energies. This method may also be useful at intermediate energies, near the balance energy where directed flow vanishes
Studying the energy dependence of elliptic and directed flow within a relativistic transport approach
Prognostic significance of the number of negative lymph nodes in postoperative locally advanced gastric cancer patients
Spatial and temporal evolution of landscape pattern in downtown area of Jixi City, China
Analysis of photonic band gaps in a two-dimensional photonic crystal with centrifugal core-shell rods
42.70.Qs Photonic bandgap materials, 78.20.Bh Theory, models, and numerical simulation,