Simulation of DY processes

1
Simulation of DY processes in the COMPASS
Spectrometer Michela Chiosso Torino, 5-6 March
2007
2
MC Simulation chain

• ???Drell-Yan dimuon events generation with
  Bianconis generator
• DY_AB5
• output file .dat with energy, ???? for both ??
  and ???in LAB Ref system
• ???Conversion of generated data to a format
  readable from ComGeant
• 3. Processing of generated data with ComGeant
• muon run spectrometer with smaller target
  (see Lauras talk)
• 4. Reconstruction of simulated events.

3
Generated events

• ???- beam on transversely polarized NH3 target
  (spin along LAB y)
• ? 0.1 GeV/c lt PT lt 6.0 GeV/c
• ??Generated 500000 events per file
• 1. S200 (P?- 106 GeV /c)
• a. 1.0 GeV lt M???? lt 3.5 GeV
• b. 3.5 GeV lt M???? lt 9 GeV
• 2. S300 (P?? 160 GeV /c)
• a. 1.0 GeV lt M???? lt 3.5 GeV
• b. 3.5 GeV lt M???? lt 9.0 GeV
• ???Processed so far, with ComGeant, 50000 events
  per each generated file
• ? Reconstruction with Coral

4
MW1 and MW2 acceptance
Total acceptance ?????in MW1 ???? in MW2
????? in MW1 and ????? in MW2
5
Vertex coordinates
mm
mm
Vertex distribution
6
MW1 and MW2 acceptance
Total acceptance ?????in MW1 ???? in MW2
????? in MW1 and ????? in MW2
generated ????? in MW1
????? in MW2 ????? in MW1,
????? in MW2
Q2
Pt
Xf
67.5 2.5
30
7
1.5 GeV lt M???? lt 2.5 GeV
53 GeV ?- beam(S100)
8
4.0 GeV lt M???? lt 9.0 GeV
53 GeV ?- beam
9
1.0 GeV lt M???? lt 3.5 GeV
106 GeV ?- beam (S200)
MC
RC
10
1.0 GeV lt M???? lt 3.5 GeV
106 GeV ?- beam
RC
MC
11
1.0 GeV lt M???? lt 3.5 GeV
106 GeV ?- beam
MC
RC
12
1.0 GeV lt M???? lt 3.5 GeV
106 GeV ?- beam
Q2
Pt
Xf
13
1.0 GeV lt M???? lt 3.5 GeV
160 GeV ?- beam
MC
RC
14
1.0 GeV lt M???? lt 3.5 GeV
160 GeV ?- beam
RC
MC
15
1.0 GeV lt M???? lt 3.5 GeV
160 GeV ?- beam
MC
RC
16
1.0 GeV lt M???? lt 3.5 GeV
160 GeV ?- beam
Q2
Pt
Xf
17
3.4 GeV lt M???? lt 9.0 GeV
106 GeV ?- beam
MC
RC
18
3.4 GeV lt M???? lt 9.0 GeV
160 GeV ?- beam
MC
RC
19
3.4 GeV lt M???? lt 9 GeV
106 GeV ?- beam
Q2
Pt
Xf
20
3.4 GeV lt M???? lt 9 GeV
160 GeV ?- beam
Q2
Pt
Xf
21
- MC
- RC inside MW acceptance
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Acceptance Reconstruction Efficiency
106 GeV ?- beam
Q2
Pt
Pt
23
Acceptance Reconstruction Efficiency
160 GeV ?- beam
Q2
Pt
Pt
24
- The chain is ready to be used DY_AB generator
Converter ComGeant Coral Phast - Work
is in progress. - Still a lot of job has to be
done!