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

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M. 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

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

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

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M. Colantoni - JIRN Dubna5 Simulation chain Comgeant version 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 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

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M. Colantoni - JIRN Dubna6 Very preliminary results on background studies

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M. 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)

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M. Colantoni - JIRN Dubna8 Statistics Background events generated 2·10 6 Events reconstructed 10 5 Background events generated 2·10 6 Events reconstructed 10 5

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M. 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

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M. Colantoni - JIRN Dubna10 no Wall requested

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M. Colantoni - JIRN Dubna11 no Wall requested E + [GeV] E - [GeV] q 2 [GeV] 2 p T [GeV]

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

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M. Colantoni - JIRN Dubna13 x1 x2 distributions wall1 p- wall1 n wall1 p- wall2 n no request

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M. 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

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M. 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

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M. Colantoni - JIRN Dubna16 no Wall requested vz [cm] vy [cm] vx [cm]

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M. Colantoni - JIRN Dubna17 no Wall requested E + [GeV] q 2 [GeV] 2 p T [GeV]xf

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

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M. 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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