add benchmark for sampling calorimeter

benchmarks/sampling_ecal/sim_emcal_barrel_electrons.sh

@@ -29,7 +29,8 @@ echo "CB_EMCAL_NUMEV = ${CB_EMCAL_NUMEV}"
 echo "CB_EMCAL_COMPACT_PATH = ${CB_EMCAL_COMPACT_PATH}"
 
 # Generate the input events
-python benchmarks/sampling_ecal/gen_particles.py ${CB_EMCAL_GEN_FILE} --angmin 90 --angmax 90 --parray ${CB_EMCAL_ENERGY} --particles 11
+python benchmarks/sampling_ecal/scripts/gen_particles.py ${CB_EMCAL_GEN_FILE} \
+    --angmin 90 --angmax 90 --parray ${CB_EMCAL_ENERGY} --particles="-11"
 if [[ "$?" -ne "0" ]] ; then
   echo "ERROR running script: generating input events"
   exit 1