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T: Fachverband Teilchenphysik

T 44: Eingeladene Vorträge I

T 44.4: Eingeladener Vortrag

Dienstag, 1. März 2016, 15:15–15:45, VMP4 Audimax 1

Aiming for a precise Measurement of K⁺ → π⁺νν : the Start of the NA62 Experiment — •Gia Khoriauli for the NA62 collaboration — Johannes Gutenberg University Mainz

NA62 is a fixed target experiment at CERN. The main goal of the experiment is to measure precisely the rare Kaon decay K⁺ → π⁺νν. Kaons are produced together with other particles by hitting a Beryllium target with a 400 GeV/c proton beam supplied by the CERN SPS. A secondary Kaon beam with 75 GeV/c (± 1%) momentum and signal events are selected with the NA62 detector. K⁺ → π⁺νν is an extremely interesting decay, since its tiny branching ratio is precisely known in the Standard Model. Therefore, this decay is sensitive to possible new physics phenomena, which can alter its branching ratio. As a FCNC interaction, the decay is forbidden at the tree level in the Standard Model. The most recent theoretical calculation provides BR(K⁺ → π⁺νν) = (9.11 ± 0.72) · 10⁻¹¹ with the uncertainty stemming mostly from the knowledge on |V_ts|. The NA62 experiment aims to test the Standard Model expectation by reaching an uncertainty of 10% in BR(K⁺ → π⁺νν). NA62 collected first data during a pilot run in 2014. The first physics run took place in 2015. Important steps have been made in understanding and optimization of the performance of the NA62 sub-detectors and the physics triggers during the physics run 2015. First preliminary physics results as well as the theory framework and the NA62 detector are presented in this work.