The Snowmass study produced a proposed compact detector design featuring a W-Si EM calorimeter and Fe-scintillator hadron section. It was estimated that the EM resolution would be 15%/ÖE while the hadronic resolution would be 45%/ÖE. This study is intended to verify those assertions using full shower simulations.

The GISMO simulation of NLD has been developed on NT, ported to run on AIX and under batch execution.

Initial Data

Sample energies range 5GeV £ Incident E £ 50GeV with between 500 and 1000 events for each entry. Histograms for 20GeV electron and pion events display the data used to calculate response and resolution trends. 

The Ntupler tool written by Dave Wagner translates GISMO data files into *.hbook format.  That file is then translated to ROOT format and analysis is done using the ROOT package.   Ntupler creates two aggregate ROOT branch entries of total energy deposited in both the EM and HAD components.    

Response

The e/m and p/m for generated events are 0.86 and 0.76, respectively.  By comparison,  SLD p/µ is 0.45-0.50 while e/m is around 0.69.  Data sets for photons were also generated and shower in much the same way as electrons.

Resolution

Best fit lines yield an EM resolution between 15 and 19%/ÖE, and a HAD resolution between 39 and 40%/ÖE.   The EM is close to the predicted 15%; the HAD is about 6% lower than the expected 45%.

Validation

High HAD response and vastly improved HAD resolution suggest a need for more detailed study.  SLD data can be used to crosscheck GISMO performance.  In sum, GISMO reproduced SLD's luminosity monitor response and resolution quite well and came within about 10% for the SLD barrel LAC. It is assumed that this comparison validates GISMO's results for the NLD configuration.

C.Colgur & R.Dubois

Last Modified: 01/13/04 12:42