Seminar of Physics - Ľuboš Bičian (3.10.2017)

Tuesday 3.10.2017 at 14:00, Lecture room F2/125

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Ľuboš Bičian:
Limits on heavy neutrinos at NA62

Abstract:
The NA62 is a fixed-target kaon experiment situated in the North Area in the CERN Prévessin site. Kaons are produced as a part of a secondary hadron beam from the primary SPS protons and are decaying in-flight inside an evacuated tank.

The main purpose of the experiment is to measure the branching fraction of an ultra-rare kaon decay $K^+ \rightarrow \pi^+ \nu \bar{\nu}$ with a precision similar to that of the SM prediction.

The NA62 gives an opportunity to simultaneously collect data using several specialized triggers. Therefore, apart from the main decay, the NA62 is capable of measuring properties of other rare kaon decays and even probing beyond the SM physics.

In this seminar, I will introduce the NA62 experiment, briefly describe the challenges of the main decay measurement and then focus on one of the already finished analyses: search for a heavy neutrino (HN) state in $K^+ \rightarrow e^+ N$ data sample. An overview of theoretical motivation for the searches of HNs as well as a short description of the analysis will be given.

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