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Optimization of L1 Trigger Algorithm for J/Ψ Detection: A Simulation Study

This study focuses on developing the Level 1 (L1) trigger algorithm for efficient J/Ψ signal detection while minimizing data collection. By integrating UrQMD and Pluto simulations, we analyze the separation of J/Ψ signals from hadron and lepton backgrounds. The methodology includes parameter determination for rejection factor and J/Ψ detection efficiency, emphasizing the importance of angular and momentum cuts. Preliminary results indicate the trigger simulation's effectiveness, though further optimization is required to reduce background contributions. Future work will utilize the CBM framework for enhanced simulation accuracy.

june
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Optimization of L1 Trigger Algorithm for J/Ψ Detection: A Simulation Study

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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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