Precision Measurement of the Ratio of the Charged Kaon Leptonic Decay Rates

2012/12/17 by The NA62 collaboration, The NA62 Collaboration · 3 citations
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex

paper · pdf · doi:10.48550/arxiv.1212.4012

Accepted for publication in Physics Letters B (18 January 2013). 18 pages, 6 figures

arxiv created 2013/01/29 · arxiv updated 2013/01/30

Abstract

A precision measurement of the ratio RK of the rates of kaon leptonic decays K+- --> e nu and K+- --> mu nu with the full data sample collected by the NA62 experiment at CERN in 2007-2008 is reported. The result, obtained by analysing ~150000 reconstructed K+- --> e nu candidates with 11% background contamination, is RK = (2.488+-0.010)*10^-5, in agreement with the Standard Model expectation.

Cited by

• Novel bounds on neutrino portal dark matter from leptonic meson decays
• Flavour Physics Beyond the Standard Model
• Measurement of the branching fraction ratio R_K at large dilepton invariant mass

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