Speaker
Description
The CBM experiment will investigate strongly interacting matter at high baryon density and moderate temperature. One of proposed key observable is the measurement of low mass vector mesons(LMVMs), which can be detected via their di-lepton decay channel.
The experimental challenge for muon measurements in heavy-ion collisions at FAIR energies is to identify low-momentum muons in an environment of high particle densities. The CBM strategy is to track the particles through a hadron absorber system, and to perform a momentum-dependent muon identification. This concept is realized by an instrumented hadron absorber, consisting of staggered absorber plates and tracking stations. The hadron absorbers vary in material and thickness, and the tracking stations consist of detector triplets based on different technologies.
At SIS100 energies, low-mass vector mesons can be identified with a MuCh system consisting of 4 absorber layers and 4 tracking stations. Simulation have been performed in order to optimize the absorber system under realistic beam conditions. As a result, the actual design of the full version of MuCh system consists of 4 hadron absorber layers (60 cm carbon and iron plates of 2 x 20 cm and 30 cm) and 4 gaseous tracking chamber triplets behind each absorber slice.
Owing to technical constraints in building a monolithic absorber layer, options on having sliced absorber layers are being considered. This results into gaps within the absorber layers which may affect the particle hit density on any detector plane. Investigations have been carried out through simulations to study the effect of this approach of fabricating the Fe-absorber layers.
Detailed simulations have been performed to optimize the detector system with respect to efficiency, signal-to-background ratio, and phase-space coverage. The event generator UrQMD and the transport code GEANT3 have been used within the CBMroot framework to simulate for central Au+Au collisions at 8 AGeV. The results for different case scenario have been compared in this study.
