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J/ Ψ Trigger Parameter Simulation

J/ Ψ Trigger Parameter Simulation. Arkadiusz Bubak Institute of Physics University of Silesia, Katowice. Motivations. Developing the (L1) first level trigger algorithm Reduction amount of collected data Separation of J/ Ψ signal from background. Methods.

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J/ Ψ Trigger Parameter Simulation

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  1. J/Ψ Trigger Parameter Simulation Arkadiusz BubakInstitute of Physics University of Silesia, Katowice

  2. Motivations • Developing the (L1) first level trigger algorithm • Reduction amount of collected data • Separation of J/Ψ signal from background Methods • Suppression hadron and lepton background • Determination of required trigger parameters: rejection factor (RF), J/Ψdetection efficiency, transversal momentum cut (Pt_cut)

  3. Hadron and lepton background • 100’000 UrQMD events • J/Ψ e+e- pairs taken randomly from a pool of 100’000 pairs generated with Pluto • Procedure mixes up events from the two above files at the desired J/Ψ multiplicity • J/Ψ multiplicity assumed to be 10-4 pairs per event (LOI January 2004) Mixing Procedure • Random choosing one of the 100’000 Pluto events per 104 UrQMD events • Each UrQMD event contains only charged pions and protons (~850 hadrons/event)

  4. Particle Restrictions • Angular cut: particles must be in the STS range (~2° < θ < ~26°) • Preliminary cut on transversal momentum > 0.5 GeV/c • Hadron contribution: π+, π-, p • Lepton contribution: decay of π0, ρ, ω, φ and J/ψ

  5. Definition • J/Ψdetection efficiency • Rejection factor (RF) • Event from range: 3.05 < Inv. Mass < 3.15

  6. Invariant mass of electrons and positrons from π0, ρ, ω, φ and J/ψ decays

  7. Invariant mass of electrons and positrons from π0, ρ, ω, φ and J/ψ decays

  8. Conclusions • The J/Ψ L1 hadron trigger simulation works well, but is still too weak for the given parameters • Lepton background: angular cut is of great importance • Hadron background: transversal momentum cut “iogi” • The main contribution to the background in the invariant mass spectrum is due to high proton production Plans for the Future • Use of CBM framework to make the simulations more realistic (e.g. angular cuts) • Further study of the hadron and lepton background

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