CBM Muon Detector (MUCH)

Welcome to the Muon System web used by CbmMuonGroup: To connect to the CBM Muon Group send an email to cbm-much@gsi.de

List of MUCH working group members:

Need to be added the full list along with institutes.


Di-muon measurements constitute a central part of the CBM research program, as they are very sensitive diagnostic probes of the conditions inside the fireball. At low invariant masses, dileptons provide information on the in-medium modification of vector mesons, which can be connected to the chiral phase transition. At intermediate invariant masses, the dilepton spectrum is dominated by thermal radiation from the fireball reflecting its temperature. At invariant masses around 3 GeV /c2, dileptons are the appropriate tool to study the anomalous charmonium suppression in the de-confined phase. The Muon Chamber (MuCh) detector system is designed to identify muon pairs which are produced in high-energy heavy-ion collisions in the beam energy range from 4 to 40 A GeV. These di-muons are expected to provide useful information about the in-medium modification of hadrons, chiral symmetry restoration and de-confinement phase transition inside a dense baryonic medium.

MUCH detector layout

The di-muon measurements would require a sophisticated muon detector system located down stream the dipole magnet housing Silicon Tracking System (STS), required determination of particle momentum. 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.