The NA62 experiment reports the branching ratio measurement at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare K+ → decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. This measurement is also used to set limits on BR(K+ → π+X), where X is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample.

Cortina Gil, E., Kleimenova, A., Minucci, E., Padolski, S., Petrov, P., Shaikhiev, A., et al. (2021). Measurement of the very rare K + → π+νν¯ decay. JOURNAL OF HIGH ENERGY PHYSICS, 2021(6) [10.1007/JHEP06(2021)093].

Measurement of the very rare K + → π+νν¯ decay

Bonaiuto, V.;Sargeni, F.;
2021-01-01

Abstract

The NA62 experiment reports the branching ratio measurement at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare K+ → decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. This measurement is also used to set limits on BR(K+ → π+X), where X is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample.
2021
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Cortina Gil, E., Kleimenova, A., Minucci, E., Padolski, S., Petrov, P., Shaikhiev, A., et al. (2021). Measurement of the very rare K + → π+νν¯ decay. JOURNAL OF HIGH ENERGY PHYSICS, 2021(6) [10.1007/JHEP06(2021)093].
Cortina Gil, E; Kleimenova, A; Minucci, E; Padolski, S; Petrov, P; Shaikhiev, A; Volpe, R; Numao, T; Petrov, Y; Velghe, B; Bryman, D; Fu, J; Husek, T;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/276059
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