Abstract— The expected hit rates of the straw tracker of the Spin Physics Detector at NICA are investigated under various collision scenarios: p–p, O–O, Kr–Kr, and Xe–Xe colliding systems. The simulation was performed using the Pythia8 and UrQMD event generators, SPDRoot framework, which made it possible to reproduce the anticipated operational conditions of the detector. Based on the obtained data, hit-rate density maps were constructed, and the spatial distributions of hit rates over the modules and layers of the straw tracker were evaluated. The degradation of the momentum resolution of tracks with increasing mass number of the colliding nuclei was also investigated. The obtained results provide an estimate of the Spin Physics Detector experiment capabilities for event reconstruction in ion–ion collisions, which is essential for the development of its ion-ion physics program.
Durov et al. (Mon,) studied this question.