A. Chikanian et al., A MOMENTUM RECONSTRUCTION ALGORITHM FOR THE PHENIX SPECTROMETER AT BROOKHAVEN, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 371(3), 1996, pp. 480-488
We have developed a non-linear grid interpolation technique to determi
ne the momenta of particles traversing an axially symmetric focusing m
agnetic field. We describe the technique, and quantify its performance
in the context of the PHENIX spectrometer.