Procedure for short-lived particle detection in the OPERA experiment and its application to charm decays

The OPERA experiment, designed to perform the first observation of νμ→ντ oscillations in appearance mode through the detection of the τ leptons produced in ντ charged current interactions, has collected data from 2008 to 2012. In the present paper, the procedure developed to detect τ particle decays, occurring over distances of the order of 1 mm from the neutrino interaction point, is described in detail. The results of its application to the search for charmed hadrons are then presented as a validation of the methods for ντ appearance detection.

Evidence for νμ → ντ appearance in the CNGS neutrino beam with the OPERA experiment

The OPERA experiment is designed to search for ν μ →ν τ oscillations in appearance mode, i.e., through the direct observation of the τ lepton in ν τ -charged current interactions. The experiment has taken data for five years, since 2008, with the CERN Neutrino to Gran Sasso beam. Previously, two ν τ candidates with a τ decaying into hadrons were observed in a subsample of data of the 2008–2011 runs. Here we report the observation of a third ν τ candidate in the τ − →μ − decay channel coming from the analysis of a subsample of the 2012 run. Taking into account the estimated background, the absence of ν μ →ν τ oscillations is excluded at the 3.4 σ level.

Aḥashṿerosh : opera

by A. Goldfaden. Arr. [for piano] by H. A. Russotta

Feryomerṭ ferḳlogṭ : from the opera Dr. Almasada

by A. Goldfaden. For violin arr. by Herman Fiedler

Feryomerṭ ferḳlogṭ. The "wandering jew" : from the opera Dr. Almasada

by A. Goldfaden. For piano arr. by Herman Fiedler

Bar Kochba : opera

by A. Goldfaden. Arr. for violin by Henry A. Russotta

Die schöne Miriam : opera

by S. Mogulesco. Arr. by H. A. Russotto

Bar Kochba. Opera by A. Goldfaden

Für Klavier solo, ohne Gesang und ohne Text

Bar Kochba. Opera by A.Goldfaden

Für Klavier solo, ohne Gesang und ohne Text

Bar Kochba. Opera by A. Goldfaden

Für Klavier solo, ohne Gesang und ohne Text

Bar Kochba. Opera by A.Goldfaden

Für Klavier solo, ohne Gesang und ohne Text

Bar Kochba- Opera by A. Goldfaden

Für Klavier solo, ohne Gesang und ohne Text

Die Zauberin : opera

by A. Goldfaden. Arr. by Henry A. Russotto

Die Zauberin : opera

by A. Goldfaden. Arr. by Henry A. Russotto