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Abstract
The OPERA hybrid detector, designed to prove neutrino oscillations in the νμ→ντ channel, was exposed to the CNGS νμ beam at a distance of 730 km from the neutrino source. Profiting of the tracking capabilities of its Emulsion Cloud Chamber system, OPERA can perform also a search for νμ→νe oscillations. Current results are compatible with the non-oscillation hypothesis in the three flavour mixing model. The same data allow to constrain the non-standard oscillation parameters θnew and Δmnew2 indicated by the LSND and MiniBooNE experiments.
Highlights
A first result of the search for νμ → νe oscillations in the OPERA experiment, located at the Gran Sasso Underground Laboratory, is presented
Packed removable doublets of emulsion films, called Changeable Sheets (CS) [14], are placed on the downstream face of each brick. They serve as interfaces between the Target Tracker” (TT) planes and the bricks to facilitate the location of the neutrino interactions
The number of observed events is compatible with the non-oscillation hypothesis and an upper limit sin2(2θ13)< 0.44 is derived at the 90% Confidence Level (C.L.)
Summary
Bricks that are candidates for containing neutrino interactions are analysed following a complex procedure described in detail in [5, 6]. A significant impact parameter of the electron track with respect to the primary vertex would allow to identify the event as a ντ CC interaction with a τ → e decay. Background (a) occurs if an e+e− pair appears to be connected to the interaction vertex and cannot be distinguished from a single particle in the first two emulsion films after the vertex or if one branch of the pair has a very low energy and remains undetected. This background was evaluated directly from the data. The total amount of the considered background for the νe CC interaction search is 0.4 ± 0.2 events
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