A precision test of lepton flavour universality has been performed by measuring the ratio RKRK of kaon leptonic decay rates K+→e+νK+→e+ν and K+→μ+νK+→μ+ν in a sample of 59 813 reconstructed K+→e+νK+→e+ν candidates with (8.71±0.24)%(8.71±0.24)% background contamination. The result RK=(2.487±0.013)×10−5RK=(2.487±0.013)×10−5 is in agreement with the Standard Model expectation.
Test of Lepton Flavour Universality in $K^+ -> l^+\nu$ Decays / Ambrosino, Fabio; DI FILIPPO, Domenico; Massarotti, Paolo; Napolitano, Marco; V., Palladino; Saracino, Giulio; Na62, Collaboration. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 698:(2011), pp. 105-114. [10.1016/j.physletb.2011.02.064]
Test of Lepton Flavour Universality in $K^+ -> l^+\nu$ Decays.
AMBROSINO, FABIO;DI FILIPPO, DOMENICO;MASSAROTTI, PAOLO;NAPOLITANO, MARCO;SARACINO, GIULIO;
2011
Abstract
A precision test of lepton flavour universality has been performed by measuring the ratio RKRK of kaon leptonic decay rates K+→e+νK+→e+ν and K+→μ+νK+→μ+ν in a sample of 59 813 reconstructed K+→e+νK+→e+ν candidates with (8.71±0.24)%(8.71±0.24)% background contamination. The result RK=(2.487±0.013)×10−5RK=(2.487±0.013)×10−5 is in agreement with the Standard Model expectation.| File | Dimensione | Formato | |
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