Muon momentum measurement in ICARUS-T600 LAr-TPC via multiple scattering in few-GeV range

TL;DR

This paper demonstrates muon momentum measurement in the ICARUS-T600 liquid argon TPC using multiple Coulomb scattering, achieving 10-25% resolution in the 0.5-4.5 GeV/c range, crucial for neutrino event reconstruction without magnetic fields.

Contribution

It introduces a method to measure muon momentum via multiple Coulomb scattering in a large LAr-TPC, validated with a significant sample of stopping muons in the few-GeV range.

Findings

Achieved 10-25% momentum resolution depending on conditions.

Validated the method with ~1000 stopping muons from CNGS neutrino interactions.

Demonstrated effectiveness for neutrino experiments without magnetic fields.

Abstract

The measurement of muon momentum by Multiple Coulomb Scattering is a crucial ingredient to the reconstruction of {\nu}{\mu} CC events in the ICARUS-T600 liquid argon TPC in absence of magnetic field, as in the search for sterile neutrinos at Fermilab where ICARUS will be exposed to ~1 GeV Booster neutrino beam. A sample of ~1000 stopping muons produced by charged current interactions of CNGS {\nu}{\mu} in the surrounding rock at the INFN Gran Sasso underground Laboratory provides an ideal benchmark in the few-GeV range since their momentum can be directly and independently obtained by the calorimetric measurement. Stopping muon momentum in the 0.5- 4.5 GeV/c range has been reconstructed via Multiple Coulomb Scattering with resolution ranging from 10 to 25 % depending on muon energy, track length and uniformity of the electric field in the drift volume.