First search for K + →π + νν̅ using the decay-in-flight technique

Research output: Contribution to journalArticlepeer-review

Authors

  • NA62 Collaboration

Colleges, School and Institutes

External organisations

  • UNIVERSITE CATHOLIQUE DE LOUVAIN
  • Sofia University St. Kliment Ohridski
  • TRIUMF
  • University of British Columbia
  • Charles University in Prague
  • Johannes Gutenberg University
  • Sezione INFN di Ferrara
  • Sezione INFN di Firenze

Abstract

The NA62 experiment at the CERN SPS reports the first search for K + →π + νν̅ using the decay-in-flight technique, based on a sample of 1.21×10 11 K + decays collected in 2016. The single event sensitivity is 3.15×10 −10 , corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14×10 −10 on the K + →π + νν̅ branching ratio at 95% CL.

Details

Original languageEnglish
Pages (from-to)156-166
Number of pages11
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume791
Early online date23 Feb 2019
Publication statusPublished - 10 Apr 2019

ASJC Scopus subject areas