Based on GooFit, a GPU-friendly framework for doing maximum-likelihood fits, we have developed a tool for extracting model-independent S-wave amplitudes from three-body decays such as D+ --> h(')-,h+,h+. A full amplitude analysis is done where the magnitudes and phases of the S-wave amplitudes (or alternatively, the real and imaginary components), are anchored at a finite number of m^2(h(')-,h+), and a cubic spline is used to interpolate between these points. The amplitudes for P-wave and D-wave resonant states are modeled as spin-dependent Breit-Wigners. GooFit uses the Thrust library to launch all kernels, with a CUDA back-end for nVidia GPUs and an OpenMP back-end for compute nodes with conventional CPUs. Performance on a variety of these platforms is compared. Execution time on systems with GPUs is a few hundred times faster than running the same algorithm on a single CPU.
|Primary Keyword (Mandatory)||Analysis tools and techniques|
|Tertiary Keyword (Optional)||High performance computing|
|Secondary Keyword (Optional)||Parallelizarion|