Principle Simulations for Detector Concepts at HESR Goals Methods Current Status Application to p + p   ´(3686) GSI Workshop on its Future Facility 18.10.2000.

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Presentation transcript:

Principle Simulations for Detector Concepts at HESR Goals Methods Current Status Application to p + p   ´(3686) GSI Workshop on its Future Facility J.Ritman Uni. Gießen

Goals Fast Simulation Environment Able to evaluate many different configurations and do multiple iterations Correct Kinematics Background Evaluation Determine the required resolution and rate capabilities Study trigger concepts (e.g.  -Cha, RICH, multiplicity jump near vertex)

Methods ROOT as framework PLUTO++ as event generator (Marios Kagarlis) Pseudo-Tracking –Correct treatment of motion and decays in magnetic fields. –Parameterizations of detector efficiencies and resolutions.

HESR Detector Concept

Results for p p   ´(3686) Signal: (235 nb) p + p   ´  e + e - (0.88%)  +  - (1.03%) J/  +  - (31%) J/  2  o  (18.2%) J/  (2.7%) 2  + 2  -  0 (0.35%) 2  + 2  -  0 (0.3%) Background: (  tot =56mb)  +  -  (4  b)  +  - +  o  (40  b)  +  - +  (5  b)  +  - +  o  (15  b)  +  - +   (60  b)  +  - +  (10  b)  +  - +  o  o (200  b)  +  - +  +  - (30  b)  +  - +  o  +  - (400  b)

Muon Phase Space Distributions J/   +  - Generated Detected ‘+-‘+-

Expected Signal for 1 pb -1 Combinatorial background in events with  ‘ formation

Background from  and  Decay (  are mostly stopped before they decay) P(  ) ~ 0.004

Kaon Identification Reaction: p(8.5GeV)+p  X(M=4.4GeV)  J/  + 

Conclusions Simulations group being formed Fast simulation package exists 1st iteration for HESR detector Connection to GEANT4 being implemented (V.Hejny FZ-Jülich)