MINERvA Simulation - HCAL and ECAL Calorimetry Jaewon Park University of Rochester MINERvA Collaboration Meeting, Sep 29, 2006

2 Energy Loss Calculation particle ironscint

3 Detector Logical Region Scint only ECAL HCAL Nucl. target For HCAL study, lead can be ignored For theta=0deg, particle will hit DS-HCAL. For theta=40deg, it passes both DS-HCAL and OD

4 Theta dependence 2.2GeV proton beam is used Need to calibrate (or correct leakage) to make mean shift flat

5 Theta dependence HCAL=OD+DSHCAL Like to know whether mean shift is effect of leakage or improper calibration Event selection for avoiding MIP-like event makes theta dependence more complicated

6 Infinite OD With infinite OD, there will be no leakage to OD Original OD + 5cm x 19 layers

7 Guessing leakage from extended OD layers Extended OD layers: 5.72cm x cm + 5cm x 19 layers With extended OD geometry, leakage is eliminated. Mean shift got flatter but not completely flat New OD calibration might make mean shift flat.

8 Relative calibration for OD layers E id and E hcal from extended OD looks complementary shape Leakage energy is acquired from extended layers Relative calibration constant for OD can be estimated using the fact total energy should be constant a=1.3 seems best value

9 OD calibration: Applying to actual geometry Mean shift got better. Resolution increased a little bit. It’s unavoidable. Same for leakage correction Our model for leakage correction  Simple leakage correction can be based on interaction length  Want to parametise leakage as function of interaction length

10 Slot optimization v v v v orig OD v2 is not practical  Too thin most outer layer OD v4 would be best

11 ECAL -Overview Preliminary ECAH study  Electron beam is used. (Previous HCAL study uses proton beam) Looked at Energy dependence, Vertex Z dependence, theta dependence Try to find calibration constant for ECAL  Here, ID means pure plastic scintillator b and c is calculated from dE/dx weighting. (b=1.75) After some tries, ECAL calibration factor b=2.5 gives better resolution than /1.75=1.43

12 DS-ECAL Energy and Vertex Z dependence Vz = 0cm Theta=0deg b=2.53 makes mean shift flat 1GeV electron beam Resolution is better when ID/OD is high b=2.51 makes mean shift flat

13 Barrel ECAL Theta dependence E=1GeV, Vz = 0cm Theta=0,10,…50deg b alone can’t make mean shift flat 2.5 times OD calibration factor seems to mean shift flat but made resolution twice

14 Thicker ECAL 4mm lead gives ~20% decrease on resolution 3mm lead gives ~10% decrease on resolution