A precision measurement of the ratio RKRK of the rates of kaon leptonic decays K±→e±νK±→e±ν and K±→μ±νK±→μ±ν with the full data sample collected by the NA62 experiment at CERN in 2007–2008 is reported. The result, obtained by analysing View the MathML source∼150000 reconstructed K±→e±νK±→e±ν candidates with 11% background contamination, is RK=(2.488±0.010)×10−5RK=(2.488±0.010)×10−5, in agreement with the Standard Model expectation.
Precision measurement of the ratio of the charged kaon leptonic decay rates
COSTANTINI, FLAVIO;GIUDICI, SERGIO;PIERAZZINI, GIUSEPPE;SOZZI, MARCO STANISLAO;VENDITTI, STEFANO;GALLORINI, STEFANO;LAMANNA, GIANLUCA;
2013-01-01
Abstract
A precision measurement of the ratio RKRK of the rates of kaon leptonic decays K±→e±νK±→e±ν and K±→μ±νK±→μ±ν with the full data sample collected by the NA62 experiment at CERN in 2007–2008 is reported. The result, obtained by analysing View the MathML source∼150000 reconstructed K±→e±νK±→e±ν candidates with 11% background contamination, is RK=(2.488±0.010)×10−5RK=(2.488±0.010)×10−5, in agreement with the Standard Model expectation.File in questo prodotto:
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