A precision measurement of the ratio R K of the rates of kaon leptonic decays K ± → e ± ν and K ± → μ± ν with the full data sample collected by the NA62 experiment at CERN in 2007–2008 is reported. The result, obtained by analysing ∼ 150 000 reconstructed K ± → e ± ν candidates with 11% background contamination, is R K = (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 / Lazzeroni, C., Romano, A., Ceccucci, A., Danielsson, H., Falaleev, V., Gatignon, L., Goy Lopez, S., Hallgren, B., Maier, A., Peters, A., Piccini, M., Riedler, P., Frabetti, P.L., Gersabeck, E., Kekelidze, V., Madigozhin, D., Misheva, M., Molokanova, N., Movchan, S., Potrebenikov, Y.U., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 719:4-5(2013), pp. 326-336. [10.1016/j.physletb.2013.01.037]
Precision measurement of the ratio of the charged kaon leptonic decay rates
BIZZETI, Andrea;
2013
Abstract
A precision measurement of the ratio R K of the rates of kaon leptonic decays K ± → e ± ν and K ± → μ± ν with the full data sample collected by the NA62 experiment at CERN in 2007–2008 is reported. The result, obtained by analysing ∼ 150 000 reconstructed K ± → e ± ν candidates with 11% background contamination, is R K = (2.488 ± 0.010) × 10−5 , in agreement with the Standard Model expectation.
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