Speaker
Description
The Multi-Purpose Detector(MPD) is being constructed to study the properties of extremely dense nuclear matter formed in relativistic nucleus-nucleus collisions at the NICA collider energies.The yields of strange and charmed particles are the important observables sensitive to critical phenomena in phase transitions of the QGP-matter at high net-baryon density. Highly efficient registration of such short-lived products of nuclear interactions using a vertex silicon detectors will play a key role in the analysis of the possible onset of deconfinement in nuclear matter.
The Time Projection Chamber (TPC) is considered as a main detector of the MPD tracking system. Its performance will be further enhanced with a vertex inner tracking system (ITS) based on the Monolithic Active Pixel Sensors (MAPS) to provide reliable identification of short-lived hadrons. The identification ability of the ITS+TPC tracking system, when reconstructing the decays of D$^{0}$ and D$^{+}$ produced in central Au+Au collisions at $\sqrt{s_{NN}}$ = 9 GeV has been studied in the course of computer simulation in the object-oriented software framework Mpdroot. The selection of D-meson signals in the invariant mass spectrum of their decay products was performed by using a toolkit for multivariate data analysis.
Two variants of the ITS layout of the MAPS layers were considered: 5-layer configurations adopted for a beam pipe diameter of 40 and 64 mm respectively. The results of simulation show that the study of the heavy-flavour physics in the MPD experiment is promising if the diameter of the MPD beam pipe is reduced to an optimum value of 40mm.
The reported study was supported by RFBR, research project No. 18-02-40075
and No. 18-02-40119
