On the e/π identification applying the CBM TRD: Comparison of measurements with the TRD prototype and GEANT3 simulation at p = 1.5 GeV/c

The comparison of the distributions of the e/π energy losses in the TRD prototype and GEANT3 simulation of the n-layered TRD realized in frames of the CBM ROOT at p = 1.5 GeV/c has shown that the GEANT3 simulation reproduces real data quite well. However, contrary to the real measurements, this does not permit one to obtain a comparable level of pion’s suppression for GEANT3 data using the most powerful method based on a likelihood functions ratio test. It is shown that the procedure of preparation of data sets corresponding to the n-layered TRD based on prototype measurements is a reason of reaching an erroneous and highly overestimated level of pion’s suppression. It is also demonstrated that the needed level of pion’s suppression could be achieved using a combined method, which is more simple for practical application.