The concept of the MPD vertex detector for the detection of rare events in Au+Au collisions at the NICA collider

摘要

A silicon vertex detector of the MPD tracking system was proposed for high-efficient registration of short-lived particles produced in nucleus-nucleus collisions. In this work the pointing resolution of the various vertex detector configurations based on monolithic active pixel sensors has been evaluated. It is shown that the five-layer model of the vertex detector surrounding a 40 mm diameter beam pipe has the best spatial resolution. This allows to reconstruct the decay vertices of short-lived charmed particles. The yield of D mesons, as well as the production of pions and protons, with momenta outside the region kinematically allowed for p+p interactions at central rapidities in Au+Au collisions at NICA collider energies, was estimated in the context of the application of this vertex detector.