TUBITAK Destekli Projelerden Çıkan Yayınlar Topluluğu
Published January 1, 2020 | Version v1
Journal article Open

CsI(Tl) pulse shape discrimination with the Belle II electromagnetic calorimeter as a novel method to improve particle identification at electron-positron colliders

Creators

  • 1. Univ Victoria, Victoria, BC V8W 3P6, Canada
  • 2. DESY, D-22607 Hamburg, Germany
  • 3. Nara Womens Univ, Nara 6308506, Japan
  • 4. Univ British Columbia, Vancouver, BC V6T 1Z1, Canada
  • 5. Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy
  • 6. Duke Univ, Durham, NC 27708 USA
  • 7. Inst Particle Phys Canada, Victoria, BC V8W 2Y2, Canada

Description

This paper describes the implementation and performance of CsI(Tl) pulse shape discrimination for the Belle II electromagnetic calorimeter, representing the first application of CsI(Tl) pulse shape discrimination for particle identification at an electron-positron collider. The pulse shape characterization algorithms applied by the Belle II calorimeter are described. Control samples of gamma, mu(+), pi(+/-), K-+/- and p/(p) over bar are used to demonstrate the significant insight into the secondary particle composition of calorimeter clusters that is provided by CsI(Tl) pulse shape discrimination. Comparisons with simulation are presented and provide further validation for newly developed CsI(Tl) scintillation response simulation techniques, which when incorporated with GEANT4 simulations allow the particle dependent scintillation response of CsI(Tl) to be modelled. Comparisons between data and simulation also demonstrate that pulse shape discrimination can be a new tool to identify sources of improvement in the simulation of hadronic interactions in materials. The K-L(0) efficiency and photon-as-hadron fake-rate of a multivariate classifier that is trained to use pulse shape discrimination is presented and comparisons are made to a shower-shape based approach. CsI(Tl) pulse shape discrimination is shown to reduce the photon-as-hadron fake-rate by over a factor of 3 at photon energies of 0.2 GeV and over a factor 10 at photon energies of 1 GeV.

Files

bib-7685baa2-dd6a-4d54-b4d0-dea04df62043.txt

Files (537 Bytes)

Name Size Download all
md5:d5bcb1e97ce1ba8d2433ab82de20e8c8
537 Bytes Preview Download