The OPERA long-baseline neutrino-oscillation experiment has observed the direct appearance of ντ in the CNGS νµ beam. Two large muon magnetic spectrometers are used to identify muons produced in the τ leptonic decay and in νµ CC interactions by measuring their charge and momentum. Besides the kinematic analysis of the τ decays, background resulting from the decay of charmed particles produced in νµ CC interactions is reduced by efficiently identifying the muon track. A new method for the charge sign determination has been applied, via a weighted angular matching of the straight track-segments reconstructed in the different parts of the dipole magnets. Results obtained for Monte Carlo and real data are presented. Comparison with a method where no matching is used shows a significant reduction of up to 40% of the fraction of wrongly determined charges.

Determination of the muon charge sign with the dipolar spectrometers of the OPERA experiment

BOZZA, Cristiano;GRELLA, Giuseppe;STELLACCI, SIMONA MARIA;
2016

Abstract

The OPERA long-baseline neutrino-oscillation experiment has observed the direct appearance of ντ in the CNGS νµ beam. Two large muon magnetic spectrometers are used to identify muons produced in the τ leptonic decay and in νµ CC interactions by measuring their charge and momentum. Besides the kinematic analysis of the τ decays, background resulting from the decay of charmed particles produced in νµ CC interactions is reduced by efficiently identifying the muon track. A new method for the charge sign determination has been applied, via a weighted angular matching of the straight track-segments reconstructed in the different parts of the dipole magnets. Results obtained for Monte Carlo and real data are presented. Comparison with a method where no matching is used shows a significant reduction of up to 40% of the fraction of wrongly determined charges.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4669110
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