Fiorenza, Renato (2024) Observation of the K+ -> pi+ nu nubar decay and measurement of its branching ratio with the NA62 experiment. [Tesi di dottorato]
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| Tipologia del documento: | Tesi di dottorato |
|---|---|
| Lingua: | English |
| Titolo: | Observation of the K+ -> pi+ nu nubar decay and measurement of its branching ratio with the NA62 experiment |
| Autori: | Autore Email Fiorenza, Renato renato.fiorenza2@unina.it |
| Data: | 12 Dicembre 2024 |
| Numero di pagine: | 145 |
| Istituzione: | Università degli Studi di Napoli Federico II |
| Dottorato: | Mathematical and physical sciences for advanced materials and technologies |
| Ciclo di dottorato: | 36 |
| Coordinatore del Corso di dottorato: | nome email Fusco, Nicola nicola.fusco@unina.it |
| Tutor: | nome email Ambrosino, Fabio [non definito] |
| Data: | 12 Dicembre 2024 |
| Numero di pagine: | 145 |
| Parole chiave: | fisica;particelle;kaone;kaoni;NA62;CERN;physics;particles;high energy;kaon;kaons |
| Settori scientifico-disciplinari del MIUR: | Area 02 - Scienze fisiche > FIS/01 - Fisica sperimentale Area 02 - Scienze fisiche > FIS/04 - Fisica nucleare e subnucleare |
| Depositato il: | 23 Ott 2025 06:37 |
| Ultima modifica: | 12 Ago 2026 05:38 |
| URI: | https://www.fedoa.unina.it/id/eprint/16929 |
Abstract
The ultra-rare K+ -> pi+ nu nubar (Kpnn) decay is a golden mode to test the Standard Model: its branching ratio is predicted very precisely, and it is highly sensitive to indirect effects of physics beyond the Standard Model. The NA62 experiment at CERN has been designed to measure BR(Kpnn), and provided the most precise measurement of this branching ratio using data collected in 2016-2018. In this PhD thesis the analysis of data collected by NA62 in 2021-2022 is reported. This dataset was collected after upgrades to the experimental apparatus, and at a higher instantaneous beam intensity with respect to the previous 2016-2018 data taking. Combining NA62 data collected between 2016 and 2022, the first observation of the Kpnn decay with a significance exceeding 5 sigma is reported, and a measurement of BR(Kpnn) = (13.0 +3.3 -3.0) * 10^-11 is obtained. To date, this is the smallest branching ratio ever measured with a signal significance above 5 sigma.
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