Search for anomalies in the ν e appearance from a ν μ beam

We report an updated result from the ICARUS experiment on the search for νμ → νe anomalies with the CNGS beam, produced at CERN with an average energy of 20 GeV and traveling 730 km to the Gran Sasso Labora- tory. The present analysis is based on a total sample of 1995 events of CNGS neutrino interactions, which corresponds to an almost doubled sample with respect to the previously published result. Four clear νe events have been visually identified over the full sample, compared with an expecta- tion of 6.4 ± 0.9 events from conventional sources. The re- sult is compatible with the absence of additional anomalous contributions. At 90 % and 99 % confidence levels, the lim- its to possible oscillated events are 3.7 and 8.3 respectively. The corresponding limit to oscillation probability becomes consequently 3.4 × 10−3 and 7.6 × 10−3 , respectively. The present result confirms, with an improved sensitivity, the early result already published by the ICARUS Collabora- tion.