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Principle Simulations for Detector Concepts at HESR

This document outlines the principles, goals, methods, and current status of simulation efforts for detector concepts at the HESR, focusing on the production of Y´(3686) in proton-proton collisions. It aims to establish a fast simulation environment for evaluating various detector configurations, performing background evaluations, and determining resolution requirements. Key methodologies include the use of ROOT and PLUTO++ frameworks, with a focus on correct kinematics and motion treatment in magnetic fields. Results highlight the expected signals and background characterizations for future experiments.

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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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