Performance of the CMS High Granularity Calorimeter prototype to charged pion beams of 20-300 GeV/c
Creators
- 1. Bogazici Univ, TR-34342 Istanbul, Turkiye
- 2. Georgian Tech Univ, 77 Kostava Str, Tbilisi 0175, Georgia
- 3. Natl Cent Univ Taipei NCU, 300 Jhongda Rd, Jhongli 32001, Taiwan
- 4. CERN, Espl Particules 1, CH-1211 Geneva 23, Switzerland
- 5. Texas Tech Univ, Lubbock, TX 79409 USA
- 6. Univ Iowa, 203 Van Allen Hall, Iowa City, IA 52242 USA
- 7. Carnegie Mellon Univ, 5000 Forbes Ave, Pittsburgh, PA 15213 USA
- 8. Indian Inst Sci Educ & Res, Dr Homi Bhabha Rd, Pune 411008, Maharashtra, India
- 9. Fermilab Natl Accelerator Lab, Wilson Rd, Batavia, IL 60510 USA
- 10. Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany
- 11. Univ Maryland, College Pk, MD 20742 USA
- 12. Natl Tech Univ Athens, 9 Heroon Polytech St, Athens 15780, Greece
Description
The upgrade of the CMS experiment for the high luminosity operation of the LHC comprises the replacement of the current endcap calorimeter by a high granularity sampling calorimeter (HGCAL). The electromagnetic section of the HGCAL is based on silicon sensors interspersed between lead and copper (or copper tungsten) absorbers. The hadronic section uses layers of stainless steel as an absorbing medium and silicon sensors as an active medium in the regions of high radiation exposure, and scintillator tiles directly read out by silicon photomultipliers in the remaining regions. As part of the development of the detector and its readout electronic components, a section of a silicon-based HGCAL prototype detector along with a section of the CALICE AHCAL prototype was exposed to muons, electrons and charged pions in beam test experiments at the H2 beamline at the CERN SPS in October 2018. The AHCAL uses the same technology as foreseen for the HGCAL but with much finer longitudinal segmentation. The performance of the calorimeters in terms of energy response and resolution, longitudinal and transverse shower profiles is studied using negatively charged pions, and is compared to GEANT4 predictions. This is the first report summarizing results of hadronic showers measured by the HGCAL prototype using beam test data.
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