Monte Carlo Simulation of DY signalusing standard Compass software:

very preliminary results

M. Chiosso Drell –Yan meeting, Dubna, 14/12/2006

MC Simulation chain

Drell-Yan dimuon events generation with Bianconi’s 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 Laura’s talk)

4. Reconstruction of simulated events with Coral To do

Generated events- beam on transversely polarized NH3 target (spin along LAB +y)

1.0 GeV/c < PT < 10.0 GeV/c -1 < Xf < +1

Generated 130000 events per each file with, respectively :1. S=100 (P- = 53 GeV /c) a. 1.0 GeV <= M <= 9.0 GeV b. 1.5 GeV <= M <= 2.5 GeV c. 4 GeV <= M <= 9 GeV

2. S=200 (P = 106 GeV /c) a. 0.0 GeV <= M <= 9.0 GeV b. 1.5 GeV <= M <= 2.5 GeV c. 4.0 GeV <= M <= 9.0 GeV

3. S=300 (P- = 160 GeV /c)

a. 0.0 GeV <= M <= 9.0GeV

Processed so far, with ComGeant, 50000 events per each generated file

MW1 and MW2 acceptance

Total acceptance = in MW1 + in MW2 + in MW1 and in MW2

Vertex coordinates

Vertex distribution

mm mm

MW1 and MW2 acceptance

Total acceptance = in MW1 + in MW2 + in MW1 and in MW2

Q2

Pt

Xf

generated in MW1 in MW2 in MW1, in MW2

67.5% 2.5% 30%

53 GeV - beam (S=100) 1.0 GeV <= M <= 9.0 GeV

Generated events Events inside acceptance

Q2 Pt Xf Pl

Angle x2 vs x1 E vs E

53 GeV - beam (S=100) 1.5 GeV <= M <= 2.5 GeV

Q2 Pt Xf Pl

Angle x2 vs x1 E vs E

53 GeV - beam 4.0 GeV <= M <= 9.0 GeV

Q2 Pt Xf Pl

Angle x2 vs x1 E vs E

53 GeV - beam 1.0 GeV <= M <= 9.0 GeV

Acceptance

53 GeV - beam 1.5 GeV <= M <= 2.5 GeV

53 GeV - beam 4.0 GeV <= M <= 9.0 GeV

106 GeV - beam (S=200) 0.0 GeV <= M <= 9.0 GeVGenerated events Events inside acceptance

Q2 Pt Xf Pl

Angle x2 vs x1 E vs E

106 GeV - beam 1.5 <= M <= 2.5

106 GeV - beam 4.0 <= M <= 9.0

Q2 Pt Xf Pl

Angle x2 vs x1 E vs E

106 GeV - beam 0 <= M <= 9

Acceptance S200

Acceptance

106 GeV - beam 1.5 <= M <= 2.5

106 GeV - beam 4.0 <= M <= 9.0

160 GeV - beam (S=300) 0.0 <= M <= 9.0Generated events Events inside acceptance

Q2 Pt Xf Pl

Angle x2 vs x1 E vs E

160 GeV - beam 0.0 <= M <= 9.0

53 GeV - beam

Generated Inside A 1.5<=M<=2.5 4.0<=M<=9.0 50000 25894 5718 66

160 GeV - beam

Generated Inside A 1.5<=M<=2.5 4.0<=M<=9.0 50000 29102 7249 397

106 GeV - beam

Generated Inside A 1.5<=M<=2.5 4.0<=M<=9.0 50000 29334 6953 278

Selection of events out from resonances region