Recent results in kaon physics

NA62 Collaboration

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

A review of the present experimental status of the K → πνν (Kπνν) and other kaon decay analyses at experiments NA62 (CERN) and KOTO (J-PARC) is given. The Kπνν decay is one of the best candidates among the rare meson decays for indirect searches for new physics in the mass ranges complementary to those accessible by current accelerators. The Standard Model (SM) prediction of the branching fraction (B) of the Kπνν decay is lower than 1010 in both neutral and charged modes. The NA62 experiment aims to measure the B of the charged mode with better than 10% precision. Three candidate events, compatible with the SM prediction, have been observed from a sample of 2.12×1012 K+ decays collected in 2016 and 2017 by NA62. More than twice the statistics is available in the 2018 dataset currently being analysed. The KOTO experiment in Japan aims to measure B(KL → π0νν) using a technique similar to NA62, but with much lower momentum. In the first dataset taken in 2015 zero signal candidate events were observed. The current status of the analysis of the 2016-2018 dataset with 1.4 times more data is presented. Finally, the most recent results of other physics analyses at the NA62 experiment are summarised.

Original languageEnglish
Title of host publicationProceedings of Science
Volume377
Publication statusPublished - 2019
Event18th International Conference on B-Physics at Frontier Machines, BEAUTY 2019 - Ljubljana, Slovenia
Duration: 29 Sept 20194 Oct 2019

Publication series

NameProceedings of Science
PublisherSISSA
ISSN (Print)1824-8039

Conference

Conference18th International Conference on B-Physics at Frontier Machines, BEAUTY 2019
Country/TerritorySlovenia
CityLjubljana
Period29/09/194/10/19

Bibliographical note

Funding Information:
This contribution to the proceedings of Beauty2019 conference was supported by Comenius University Bratislava, Slovakia via grant UK/106/2019.

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

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