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2 | RE01 - An extended example for run and event |
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3 | -------------------------------------------- |
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4 | |
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5 | Contact : M.Asai (SLAC) |
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6 | |
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7 | 1. Introduction |
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8 | |
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9 | This example demonstrates how to connect the information between |
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10 | primary particles and hits. It also utilize some user-information |
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11 | classes. |
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12 | |
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13 | 1.1 Geometry and region information |
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14 | |
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15 | It has a quite simple sylindrical tracker of 5 layers and a |
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16 | sylindrical calorimeter of lead and scintillator. Dedicated regions |
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17 | are assigned to both tracker and calorimeter mother volumes not |
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18 | for setting additional production thresholds but for adding some |
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19 | more information to these regions. RE01RegionInformation is the |
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20 | class for this purpose. |
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21 | A "readout geometry" is attached to the calorimeter to define |
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22 | its cells. |
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23 | |
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24 | 1.2 Physics |
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25 | |
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26 | This example basically uses LHEP_BERT physics list. In addition |
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27 | to this, RE01DecayPhysics is used for adding G4UnknownParticle and |
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28 | G4UnknownDecay process. |
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29 | |
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30 | 1.3 Event generator |
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31 | |
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32 | An event sample is attached. This event has a Higgs particle |
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33 | which decays into e+e- and mu+mu- pairs through two Z bosons. |
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34 | It uses G4HEPEvtInterface. |
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35 | In this example, by utilizing G4UnknownParticle, all particles |
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36 | appear in the primary event are converted to G4Track and then |
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37 | to RE01Trajectory. Relation between primary particles and track |
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38 | IDs are shown at the end of event execution. |
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39 | |
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40 | 2. "Source track" information |
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41 | |
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42 | "Source track" is meant for a track that is either a primary |
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43 | particle or a track born is the tracking region. This information |
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44 | is stored in RE01TrackInformation class object and copied from |
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45 | a parent track to its daughters. |
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46 | |
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47 | 2.1 Track suspension |
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48 | |
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49 | All source tracks are suspended for their tracking when they are |
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50 | getting into the calorimeter region. Thus, all tracks in the tracker |
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51 | region are tracked before generating any shower in the calorimeter. |
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52 | |
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53 | 2.2 Tracker hits associated with primary particle information |
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54 | |
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55 | Information kept in RE01TrackInformation is used to connect each |
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56 | tracker hit to the primary particle. |
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57 | |
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58 | 2.3 Energy deposition of each source track |
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59 | |
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60 | Utilizing RE01StackingAction, shower generation is done for each |
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61 | souorce track separately, and thus energy deposition in calorimeter |
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62 | cells are shown for each individual source track. With the trajectory |
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63 | information, energy deposition for each primary particle can also |
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64 | be gotten. |
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65 | |
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66 | |
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