Detection of Low Mass Vector Mesons in the Muon Detector of CBM Experiment

摘要

91.1 Introduction FAIR is an upcoming facility that will conduct 4 different experiments like APPA, CBM, NUSTAR, PANDA. Among them, CBM aims to study the exotic state of nuclear matter at very high net baryon density. In CBM, heavy ions will be collided in the energy range 4-40 AGeV. This energy region will probe the phase diagram of QCD matter at moderate temperature and very high net baryon density. Dimuon measurement is a significant part of CBM research program. As muons are weakly interacting particles, they will not be affected by the final state effect of strongly interacting medium produced in heavy ion collision and thus carry undistorted information of the fireball. Here our focus is on dimuon measurement enabled by muon detection system (MUCH) of the CBM experimental set up. The entire dimuon spectrum can be broadly divided into three regions- the low mass region (M_(μ+μ-) < M_?), the intermediate mass region ( M? M_(J/ψ)). Dimuons in the low mass range originate from the decay of LMVMs. Detection of such low momentum muons at a very high interaction rate in the FAIR energy range is highly challenging due to very high background contamination. In this article, we will report the feasibility of LMVMs detection via their dimuon decay channel by the muon detection system at CBM.