1. GEANT and Veto Updates M. H. Wood University of Massachusetts, Amherst

2. Low Mass  0 Peak Primex data Primex Proposal

3. Veto Update Position (x,y) reconstruction complete Position (x,y) reconstruction complete Charged-particle efficiency ~96% Charged-particle efficiency ~96% Neutral-particle misidentification ~1% Neutral-particle misidentification ~1% Timing in process of being refined Timing in process of being refined Photon time – veto time

4. GEANT Update Complete geometry (targets, target box, target ladder, PS magnet, HyCal, helium bag, Veto) Complete geometry (targets, target box, target ladder, PS magnet, HyCal, helium bag, Veto) Geometry to be added (PS counters, TAC) Geometry to be added (PS counters, TAC) Built-in generators Built-in generators  0 production Pb, proton, and carbon  0 production Pb, proton, and carbon Snake-scan Snake-scan Photon beam for background Photon beam for background Translation to raw banks (psim_digitize) Translation to raw banks (psim_digitize) HyCal is working HyCal is working Veto is woking and being refined Veto is woking and being refined

5. Angular Acceptance Generated events from MCPART bank Detected from HYCALCLUSTER bank

6. Simulation – x,y positions

7. Acceptance from MCPART Detected events are selected Two clusters in fiducial area of calorimeter (-60cm<x,y<60cm) Cut out clusters around beamline (-5cm<x,y<5cm) Cluster energy cut

8. Acceptance from Proposal

9. Veto Simulation MCDEPOSITED bank changes MCDEPOSITED bank changes Each counter hit has 3 rows (total, top, bottom) Each counter hit has 3 rows (total, top, bottom) Added time info for each row Added time info for each row Modified the veto library to analyze simulations Modified the veto library to analyze simulations For simulations, only 2 cuts For simulations, only 2 cuts Top, bottom id matching Top, bottom id matching Top, bottom time difference Top, bottom time difference

10. Additional Cuts Throw away events with clusters with positions -10cm<x<10cm and -5cm<y<5cm.

11. Simulations with HYCALCLUSTER All clusters x,y cuts E cluster cut Expanded x,y cuts