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T: Fachverband Teilchenphysik

T 11: Hochenergie-Neutrinophysik 1

T 11.3: Talk

Monday, March 24, 2014, 11:35–11:50, P13

ν_e Appearance at OPERA - Electromagnetic Shower Energy Estimation — •Annika Hollnagel for the OPERA-Hamburg collaboration — Universität Hamburg, Institut für Experimentalphysik

The long-baseline neutrino oscillation experiment OPERA has been designed for the direct observation of ν_τ appearance in the CNGS ν_µ beam. Located at the LNGS underground laboratory, the OPERA detector is built of about 150000 high-resolution Emulsion Cloud Chamber modules (ECC bricks) and equipped with Electronic Detector (ED) elements for online readout, interaction location, and the measurement of particle charge and momentum.

The micrometric resolution provided by the ECC bricks (required for the detection of the short-lived τ leptons created in ν_τ CC interactions) also allows to identify the electromagnetic showers from ν_e CC interactions. Combined with the information provided by the ED, the shower energy may be estimated. This allows to define selection cuts for improving the signal-to-noise ratio of oscillated ν_e events vs. the intrinsic beam contamination, increasing the sensitivity for standard 3-flavour and sterile ν oscillations.