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Simulation of Soft Photon Calorimeter: Insights from JINR Student Practice in 2011

This document outlines the participant contributions from the 2011 JINR Student Practice focused on simulating a soft photon calorimeter. Key objectives include understanding photon production, familiarization with simulation tools like GEANT, PYTHIA, and PAW, and analyzing the energy deposition spectra of photons in high-energy collisions. The study utilizes a BGO crystal setup to measure low-energy photon deposits and discusses the capability of detecting soft photons amidst high-energy particle background. Conclusively, the small detector dimensions do not hinder its sensitivity, ensuring effective measurement and simulation accuracy.

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Simulation of Soft Photon Calorimeter: Insights from JINR Student Practice in 2011

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  1. JINR, DUBNA Student Practice Simulation of soft photon calorimeter 2011

  2. Participant list • Vaclav Kosar Czech Technical University in Prague • Viktor Burian Czech Technical University in Prague • Andra-Georgia Ibanescu University of Bucharest

  3. JINR group: High Multiplicty (Baldin and Veksler Laboratory of High Energy Physics ) • Igor Rufanov • Elena Kokoulina • Vladimir Nikitin

  4. Physics goals • To understand photon production and it’s importance for collective phenomena explanations. • To get familiar with GEANT, PYTHIA, PAW • To simulate the spectra of photons produced in high energy collisions • To understand how a electromagnetic calorimeter works. • To simulate the energy deposition spectra of photons in a calorimeter.

  5. Study of anomalous soft photons

  6. Soft photon distribution in CMS • Isotropical with energy distribution:

  7. SVD setup

  8. BGO crystals - capability to measure low energy deposit Emin<5MeV - the dimension of one cell 4 x 4 x120 cm3 - localization of photon σ < 2 cm.

  9. The electromagnetic calorimeter Red - BGO crystals Blue - organic scintillator - cutting the charged particles Green - Veto - energy leakages From GEANT

  10. Energy response of the calorimeter

  11. Detections of photons by BGO detector 50 GeV

  12. Signal and background

  13. Conclusion • In spite of small dimension of detector it allows one to detect low energy photons with small background contribution from high energy particles. • This is achieved due to VETO detector and measurement of location of incoming photons. • Signal of soft photons is detectable for cross section of several mb, according to the simulation.

  14. Thank you!

  15. Our SPG (soft photons generator) code • Generate total momentum of photons in CMS • Generate the direction of photons in CMS • Calculate the photons momentum in LS • Calculate energy of photons in LS

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