A precision test of lepton flavour universality has been performed by measuring the ratio RK of kaon leptonic decay rates K+ → e+ν and K+ → μ+ν in a sample of 59 813 reconstructed K+ → e+ν candidates with (8.71 ± 0.24)% background contamination. The result RK = (2.487 ± 0.013) × 10−5 is in agreement with the Standard Model expectation.

Test of lepton flavour universality in K(+) -> l(+)nu decays / Lazzeroni C, Romano A, Ceccucci A, Danielsson H, Falaleev V, Gatignon L, Lopezl SG, Hallgren B, Maier A, Peters A, Piccini M, Riedler P, Dyulendarova M, Frabetti PL, Kekelidze V, Madigozhin D, Marinova E, Molokanova N, Movchan S, Potrebenikov Y, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 698:(2011), pp. 105-114. [10.1016/j.physletb.2011.02.064]

Test of lepton flavour universality in K(+) -> l(+)nu decays

BUCCI, FRANCESCA;IACOPINI, ENRICO;Lenti M;
2011

Abstract

A precision test of lepton flavour universality has been performed by measuring the ratio RK of kaon leptonic decay rates K+ → e+ν and K+ → μ+ν in a sample of 59 813 reconstructed K+ → e+ν candidates with (8.71 ± 0.24)% background contamination. The result RK = (2.487 ± 0.013) × 10−5 is in agreement with the Standard Model expectation.
2011
698
105
114
Lazzeroni C; Romano A; Ceccucci A; Danielsson H; Falaleev V; Gatignon L; Lopezl SG; Hallgren B; Maier A; Peters A; Piccini M; Riedler P; D...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/509456
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