A precision measurement of the ratio R-K of the rates of kaon leptonic decays K-+/- -> e(+/-)v and K-+/- -> mu(+/-)v with the full data sample collected by the NA62 experiment at CERN in 2007-2008 is reported. The result, obtained by analysing similar to 150 000 reconstructed K-+/- -> e(+/-)v candidates with 11% background contamination, is R-K = (2.488 +/- 0.010) x 10(-5), in agreement with the Standard Model expectation.
Precision measurement of the ratio of the charged kaon leptonic decay rates
ANZIVINO, Giuseppina;IMBERGAMO, ERMANNO;PIANDANI, ROBERTO;SERGI, ANTONINO;PICCINI, Mauro
2013
Abstract
A precision measurement of the ratio R-K of the rates of kaon leptonic decays K-+/- -> e(+/-)v and K-+/- -> mu(+/-)v with the full data sample collected by the NA62 experiment at CERN in 2007-2008 is reported. The result, obtained by analysing similar to 150 000 reconstructed K-+/- -> e(+/-)v candidates with 11% background contamination, is R-K = (2.488 +/- 0.010) x 10(-5), in agreement with the Standard Model expectation.File in questo prodotto:
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