Abstract
The feasibility study of direct open charm measurements by its decay into two daughter particles, pion and kaon, in central Pb-Pb collision at SPS energies of 158 AGeV and 40 AGeV, shows that such measurements are viable at NA61/SHINE experiment if it is supplemented with a dedicated Vertex Detector (VD). We use AMPT (A Multi-Phase Transport model) event generator to generate the physical input for simulation and employed GEANT4 application to describe particle transport through the experimental setup. The VD will allow for precise track reconstruction at the target proximity. The direct open charm measurements will be a challenging due to the low production yield and short life time of D0 mesons. The obtained results are based on the predicted yields of D0 meson by Hadron String Dynamic (HSD) model. This study also addresses the issue of VD optimization and the emphasis is put on the prospect of the development of a VD based on CMOS technology.
Highlights
T he feasibility study of direct open charm measurem ents by its decay into two daughter particles, pion and kaon, in central P b -P b collision at SPS energies of 158 AGeV and 40 AGeV, shows th a t such m easurem ents are viable at N A 61/SH IN E experim ent if it is supplem ented w ith a dedicated Vertex D etector (VD)
The VD modelled in GEANT4 consists of four detection stations VDS1, VDS2, VDS3 and VDS4 located respectively at distances of 5 cm, 10 cm, 15 cm, and 20 cm downstream of the target
When we extrapolate the results to 50 M events the total number of collected open charm mesons is ~ 64000/(64000) with Signif = 246/(197) for perfect particle identification (PID) /(no PID) case
Summary
T he feasibility study of direct open charm measurem ents by its decay into two daughter particles, pion and kaon, in central P b -P b collision at SPS energies of 158 AGeV and 40 AGeV, shows th a t such m easurem ents are viable at N A 61/SH IN E experim ent if it is supplem ented w ith a dedicated Vertex D etector (VD). In order to reconstruct D0 mesons a dedicated vertex detector providing high position resolution was conceived. The VD modelled in GEANT4 consists of four detection stations VDS1, VDS2, VDS3 and VDS4 located respectively at distances of 5 cm, 10 cm, 15 cm, and 20 cm downstream of the target.
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