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


Examples are given which prove the ICARUS detector quality through relevant physics measurements. We study the μ decay energy spectrum from a sample of stopping μ 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 μ 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 μ decay spectra, obtaining \(\rho = 0.72\pm 0.06 \textrm{(stat.)} \pm 0.08 \textrm{(syst.)}\). The energy resolution for electrons below \(\sim 50\) MeV is finally extracted from the simulated sample, obtaining \((E^e_{\textrm{meas}}-E^e_{\text{MC}})/E^e_{MC} = 11\% /\sqrt{E\textrm{[MeV]}} \oplus 2\%\).

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Received: 20 November 2003, Published online: 4 February 2004

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The ICARUS Collaboration. Measurement of the μ decay spectrum with the ICARUS liquid Argon TPC. Eur. Phys. J. C 33, 233–241 (2004).

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  • Energy Spectrum
  • Energy Resolution
  • Precise Measurement
  • Physic Measurement
  • Calibration Factor