New measurement of $K^+\to\pi^+ u\bar u$ branching ratio
The $K^+\to\pi^+\nu\bar\nu$ decay is a "golden mode" for flavour physics. Its branching ratio is predicted with high precision by the Standard Model to be less than $10^{-10}$, and this decay mode is highly sensitive to indirect effects of new physics up to the highest mass scales. The NA62 experiment at the CERN SPS is designed to study the $K^+\to\pi^+\nu\bar\nu$ decay, and provided the world’s most precise investigation of this decay using 2016--2018 data. Building on this success, the first results from a significantly improved analysis of new data, taken in 2021--2022 after beamline and detector upgrades, are presented, along with the combination with the 2016--2018 results.
Authors
- J. Carmignani (ORCID: https://orcid.org/0000-0002-1705-1061)
- A. Biagioni
- B. Bloch-Devaux
- O. Frezza
- E. Gushchin
- R. Fiorenza
- T. Capussela
- H. Danielsson
- N. De Simone
- Renato Fiorenza
- A. Gianoli
- F. Ambrosino
- V. Cerny
- X. Chang
- F. Brizioli
- C. Cerri
- A. Bizzeti
- A. Baeva
- M. U. Ashraf
- V. Bonaiuto
- D. Baigarashev
- J. Henshaw
- N. Estrada-Tristan
- E. Gamberini
- A. Filippi
- L. Gatignon
- M. D'Errico
- J. Bernhard
- B. Angelucci
- P. Cretaro
- P. Dalpiaz
- E. Cortina Gil
- F. Hahn
- M. Fiorini
- R. Aliberti
- A. Antonelli
- A. Fucci
- T. Enik
- F. Duval
- D. Bryman
- G. D’Agostini
- V. Falaleev
- T. Blazek
- L. Federici
- A. Ceccucci
- J.B. Dainton
- J. Engelfried
- C. Graham
- D. Di Filippo
- B. De Martino
- G. Georgiev
- L. Fulton
- M. Francesconi
- R. Ammendola
- V. Duk
- K. Gorshanov
- P. Boboc
- M. Ceoletta
- A. Cotta Ramusino
- M. Barbanera
- V. Bautin
- D. Coward
- J. Fu
- N. Doble
- B. Dobrich
- H. F. Heath
- S. Giudici
- M. Bragadireanu
- G. Anzivino
- V. Fascianelli
- B. Checcucci
- N. Canale
- R. Giordano
- F. Bucci
- R. Arcidiacono
- P. Cooper
- Z. Hives
- F. Costantini
- D. Britton (ORCID: https://orcid.org/0000-0001-9998-4342)
- A. Briano Olvera
- A. Akmete
- P. Cenci
- L. Bandiera
- M. Boretto
- A. Conovaloff
- S. Fedotov
- C. Biino
- S. Ghinescu
- R. Fantechi
- L. Bician
- R. Guida
- M.B. Brunetti
- D. Emelyanov
- F. Gonnella (ORCID: https://orcid.org/0000-0003-0885-1654)
- M. Corvino
- T. Bache
- J. Fry
- L. Di Lella
- E. Goudzovski
- M. Giorgi
Publication Details
- Published
- 2026-04-22
- DOI
- https://doi.org/10.22323/1.487.0047
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00