Measurement of the muon decay spectrum with the ICARUS liquid Argon TPC

Details Measurement of the muon decay spectrum with the ICARUS liquid Argon TPC Measurement of the muon decay spectrum with the ICARUS liquid Argon TPC

2003-11-19

arxiv.org/abs/hep-ex/0311040v2

Eur.Phys.J.C33:233-241,2004

Physics

High Energy Physics

High Energy Physics - Experiment

16 pages, 8 figures, LaTex, A4. Some text and 1 figure added. Final version as accepted for publication in The European Physic

Scientific paper

10.1140/epjc/s2004-01597-7

Examples are given which prove the ICARUS detector quality through relevant physics measurements. We study the muon decay energy spectrum from a sample of stopping muon events acquired during the test run of the ICARUS T600 detector. This detector allows the spatial reconstruction of the events with fine granularity, hence, the precise measurement of the range and dE/dx of the muon with high sampling rate. This information is used to compute the calibration factors needed for the full calorimetric reconstruction of the events. The Michel rho parameter is then measured by comparison of the experimental and Monte Carlo simulated muon decay spectra, obtaining rho = 0.72 +/- 0.06(stat.) +/- 0.08(syst.). The energy resolution for electrons below ~50 MeV is finally extracted from the simulated sample, obtaining (Emeas-Emc)/Emc = 11%/sqrt(E[MeV]) + 2%.

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