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Monte Carlo simulation of the background for the Drell-Yan COMPASS Marialaura Colantoni Laboratory of Nuclear Problems Dubna 14-12-2006 Marialaura.

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Presentation on theme: "Monte Carlo simulation of the background for the Drell-Yan COMPASS Marialaura Colantoni Laboratory of Nuclear Problems Dubna 14-12-2006 Marialaura."— Presentation transcript:

1 Monte Carlo simulation of the background for the Drell-Yan reaction @ COMPASS Marialaura Colantoni Laboratory of Nuclear Problems Dubna 14-12-2006 Marialaura Colantoni Laboratory of Nuclear Problems Dubna 14-12-2006

2 14-12-2006M. Colantoni - JIRN Dubna2 Aim of the simulations  + A  (  +  - ) + X Very small cross section (~ nbarn) many    from the beam and the secondary interactions  + A  (  +  - ) + X Very small cross section (~ nbarn) many    from the beam and the secondary interactions

3 14-12-2006M. Colantoni - JIRN Dubna3 Setup: muon_2006(*) (*) + small modifications Transverse polarized target magnet

4 14-12-2006M. Colantoni - JIRN Dubna4 Target region some more modifications possible: absorber to be inserted : detectors position around target

5 14-12-2006M. Colantoni - JIRN Dubna5 Simulation chain  Comgeant version 0.0.7.2  Internal generator Gheisha  100 GeV  - beam  all interactions activated  Coral 25 oct 2006 check-out  Phast.7.28  root 4.03 Everything already installed on the Turin farm  Comgeant version 0.0.7.2  Internal generator Gheisha  100 GeV  - beam  all interactions activated  Coral 25 oct 2006 check-out  Phast.7.28  root 4.03 Everything already installed on the Turin farm

6 14-12-2006M. Colantoni - JIRN Dubna6 Very preliminary results on background studies

7 14-12-2006M. Colantoni - JIRN Dubna7 Selection criteria Looking for every reconstructed vertex with:  at least 2 or more tracks  a definite momentum for each tracks  a pair  +  - No cut on vertex position or on kinematical variables was applied (not yet) Looking for every reconstructed vertex with:  at least 2 or more tracks  a definite momentum for each tracks  a pair  +  - No cut on vertex position or on kinematical variables was applied (not yet)

8 14-12-2006M. Colantoni - JIRN Dubna8 Statistics  Background events generated 2·10 6  Events reconstructed  10 5  Background events generated 2·10 6  Events reconstructed  10 5

9 14-12-2006M. Colantoni - JIRN Dubna9 Statistics  Wall1 P &  Wall1 N 309  Wall1 P &  Wall2 N 318  Wall1 N &  Wall2 P 0  Wall2 P &  Wall2 N 0  Wall1-2 P &  Wall1 N 0  Wall1-2 P &  Wall2 N 0  Wall1-2 N &  Wall1 P 0  Wall1-2 N &  Wall2 P 0  Wall1-2 P &  Wall1-2 N 0

10 14-12-2006M. Colantoni - JIRN Dubna10 no  Wall requested

11 14-12-2006M. Colantoni - JIRN Dubna11 no  Wall requested E  + [GeV] E  - [GeV] q 2 [GeV] 2 p T [GeV]

12 14-12-2006M. Colantoni - JIRN Dubna12  Wall requested  Wall1 p +  Wall1 n  Wall1 p +  Wall2 n v z [cm] q 2 [GeV] 2

13 14-12-2006M. Colantoni - JIRN Dubna13 x1 x2 distributions  wall1 p-  wall1 n  wall1 p-  wall2 n no request

14 14-12-2006M. Colantoni - JIRN Dubna14 Only Drell-Yan events  Events generated: 500  Events reconstructed: 246 Just for test  Events generated: 500  Events reconstructed: 246 Just for test

15 14-12-2006M. Colantoni - JIRN Dubna15 Statistics  Wall1 P &  Wall1 N 108  Wall1 P &  Wall2 N 93  Wall1 N &  Wall2 P 0  Wall2 P &  Wall2 N 0  Wall1-2 P &  Wall1 N 0  Wall1-2 P &  Wall2 N 0  Wall1-2 N &  Wall1 P 0  Wall1-2 N &  Wall2 P 0  Wall1-2 P &  Wall1-2 N 0

16 14-12-2006M. Colantoni - JIRN Dubna16 no  Wall requested vz [cm] vy [cm] vx [cm]

17 14-12-2006M. Colantoni - JIRN Dubna17 no  Wall requested E  + [GeV] q 2 [GeV] 2 p T [GeV]xf

18 14-12-2006M. Colantoni - JIRN Dubna18  Wall requested  Wall1 p +  Wall1 n  Wall1 p +  Wall2 n v z [cm] q 2 [GeV] 2

19 14-12-2006M. Colantoni - JIRN Dubna19 Conclusions & Outlook  preliminary test of the simulation chain  much more statistics to generate  up to now no big problems found  a lot of work to be done but…  preliminary test of the simulation chain  much more statistics to generate  up to now no big problems found  a lot of work to be done but… … the work is in progress

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