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Published January 1, 2025 | Version v1
Journal article Open

The track-length extension fitting algorithm for energy measurement of interacting particles in liquid argon TPCs and its performance with ProtoDUNE-SP data

Creators

  • 1. CERN, European Org Nucl Res, CH-1211 Meyrin, Switzerland
  • 2. Univ Oxford, Oxford OX1 3RH, England
  • 3. Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA
  • 4. Univ Atlantico, Barranquilla, Colombia
  • 5. Univ Tecnol Fed Parana, Curitiba, Parana, Brazil
  • 6. Georgian Tech Univ, Tbilisi, Georgia
  • 7. Brookhaven Natl Lab, Upton, NY 11973 USA
  • 8. Univ Bristol, Bristol BS8 1TL, Avon, England
  • 9. Univ Estadual Campinas, BR-13083970 Campinas, SP, Brazil
  • 10. Univ Houston, Houston, TX 77204 USA
  • 11. Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
  • 12. Univ Rochester, Rochester, NY 14627 USA
  • 13. Univ Colorado Boulder, Boulder, CO 80309 USA
  • 14. Kansas State Univ, Manhattan, KS 66506 USA
  • 15. Augustana Univ, Sioux Falls, SD 57197 USA
  • 16. Ctr Invest Energet Medioambientales & Tecnol, E-28040 Madrid, Spain
  • 17. Imperial Coll Sci Technol & Med, London SW7 2BZ, England

Description

This paper introduces a novel track-length extension fitting algorithm for measuring the kinetic energies of inelastically interacting particles in liquid argon time projection chambers (LArTPCs). The algorithm finds the most probable offset in track length for a track-like object by comparing the measured ionization density as a function of position with a theoretical prediction of the energy loss as a function of the energy, including models of electron recombination and detector response. The algorithm can be used to measure the energies of particles that interact before they stop, such as charged pions that are absorbed by argon nuclei. The algorithm's energy measurement resolutions and fractional biases are presented as functions of particle kinetic energy and number of track hits using samples of stopping secondary charged pions in data collected by the ProtoDUNE-SP detector, and also in a detailed simulation. Additional studies describe the impact of the dE/dx model on energy measurement performance. The method described in this paper to characterize the energy measurement performance can be repeated in any LArTPC experiment using stopping secondary charged pions.

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