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Principle Simulations for Detector Concepts at HESR

Principle Simulations for Detector Concepts at HESR. Goals Methods Current Status Application to p + p  Y ´(3686). GSI Workshop on its Future Facility 18.10.2000 J.Ritman Uni. Gießen. Goals. Fast Simulation Environment

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Principle Simulations for Detector Concepts at HESR

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  1. Principle Simulations for Detector Concepts at HESR • Goals • Methods • Current Status • Application to p + p  Y´(3686) GSI Workshop on its Future Facility 18.10.2000 J.Ritman Uni. Gießen

  2. 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. m-Cha, RICH, multiplicity jump near vertex)

  3. Methods • ROOT as framework • PLUTO++ as event generator http://www-hades.gsi.de/computing/pluto/html/PlutoIndex.html (Marios Kagarlis) • Pseudo-Tracking • Correct treatment of motion and decays in magnetic fields. • Parameterizations of detector efficiencies and resolutions.

  4. HESR Detector Concept

  5. Results for p p  Y´(3686) Background: (stot=56mb) p+p-(4 mb) p+p- + po(40 mb) p+p- + h(5 mb) p+p- + ro(15 mb) p+p- + w(60 mb) p+p- + f(10 mb) p+p- + poro(200mb) p+p- + K+K-(30 mb) p+p- + poK+K-(400mb) Signal: (235 nb) p + p Y´  e+e- (0.88%) m+m- (1.03%) J/Y p+p- (31%) J/Y2po(18.2%) J/Yh(2.7%) 2p+2p-p0 (0.35%) 2p+2p-p0 (0.3%)

  6. Muon Phase Space Distributions Generated Y‘m+m- Detected J/Y m+m-

  7. Expected Signal for 1 pb-1 Combinatorial background in events with Y‘ formation

  8. Background from p and K Decay P(#m  2) ~ 0.004 (p are mostly stopped before they decay)

  9. Kaon Identification Reaction: p(8.5GeV)+p  X(M=4.4GeV)  J/Y+f

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

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