LHCb - Minimum Bias physics plans and MC framework - EPFL
LHCb - Minimum Bias physics plans and MC framework - EPFL LHCb - Minimum Bias physics plans and MC framework - EPFL
dN dcos(θ) ∝ 1 + α cos2 (θ) θ ∠(p CM µ + , p SL J/ψ ). α=+1 transverse pol; α=-1 longitudinal pol; α=0 no polarization J/ψ polarization LHCb geometry will induce a fake J/ψ pol. LHCb MC input α input σ(nb) σ(nb) measured for α=0 0 4340 4337.3 ± 7.7 +1 4909 4305.4 ± 7.7 -1 3518 4383.0 ± 7.9 Syst. error up to 25 % if ignoring polarization. MCNet CERN R. Mures¸an, LHCb report – p.16/30
LHCb MC simulation The simulation application, Gauss, is a collection of “User Code” specialized for physics simulation based on the underlying OO software framework (Gaudi) used by all LHCb event processing software; Specialized algorithms and tools for generators (PYTHIA, EvtGen, ...) and detector simulation (Geant4); All generators “wrapped” into C++ code to make them “callable and controllable” from within the framework at run time. MCNet CERN R. Mures¸an, LHCb report – p.17/30
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<strong>LHCb</strong> <strong>MC</strong> simulation<br />
The simulation application, Gauss, is a collection of “User<br />
Code” specialized for <strong>physics</strong> simulation based on the<br />
underlying OO software <strong>framework</strong> (Gaudi) used by all<br />
<strong>LHCb</strong> event processing software;<br />
Specialized algorithms <strong>and</strong> tools for generators (PYTHIA,<br />
EvtGen, ...) <strong>and</strong> detector simulation (Geant4);<br />
All generators “wrapped” into C++ code to make them<br />
“callable <strong>and</strong> controllable” from within the <strong>framework</strong> at run<br />
time.<br />
<strong>MC</strong>Net CERN R. Mures¸an, <strong>LHCb</strong> report – p.17/30
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