Implementation of signal digitization for the SHiP Spectrometer Straw Tracker simulation

The report describes simulation of straw tube response to a charged particle penetrating the SHiP Spectrometer Straw Tracker (SST), and proposes optimization of the straw signal description. A new signal parametrization has been added into the FairSHiP software framework [1] to achieve a more realistic SST performance prediction. A comparison of the SST hit resolution obtained with the old and new parametrization versions is presented.