| Title: |
Observation of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay and measurement of its branching ratio |
| Authors: |
Cortina Gil, Eduardo; Jerhot, Jan; Lurkin, Nicolas; Bryman, Douglas; Numao, Toshio; Velghe, Bob; Wong, Vincent Wai Sum; Hives, Zdenko; Husek, Tomas; Kampf, Karol; Kolesar, Marian; Koval, Michal; de Martino, Bianca; Perrin-Terrin, Mathieu; Petit, Lucie; Döbrich, Babette; Lezki, Samet; Schubert, Jonathan; Akmete, Atakan Tugberk; Aliberti, Riccardo; Ceoletta, Marco; Doble, Niels; Di Lella, Luigi; Peruzzo, Letizia; Polivka, Celia; Schuchmann, Simone; Wahl, Heinrich; Wanke, Rainer; Dalpiaz, Pietro; Negrello, Riccardo; Neri, Ilaria; Petrucci, Ferruccio; Soldani, Mattia; Bandiera, Laura; Canale, Nicola; Cotta Ramusino, Angelo; Gianoli, Alberto; Romagnoni, Marco; Sytov, Alexei; Bizzeti, Andrea; Bucci, Francesca; Lenti, Massimo; Panichi, Ilaria; Lo Chiatto, Prisco; Ruggiero, Giuseppe; Antonelli, Antonella; Lanfranchi, Gaia; Tinti, Gemma; Martellotti, Silvia; Moulson, Matthew; Kozhuharov, Venelin; Spadaro, Tommaso; Ambrosino, Fabio; Fiorenza, Renato; d'Errico, Mariaelena; Giordano, Raffaele; Massarotti, Paolo; Mirra, Marco; Napolitano, Marco; Saracino, Giulio; Anzivino, Giuseppina; Lollini, Riccardo; Brizioli, Francesco; Cenci, Patrizia; Duk, Viacheslav; Pepe, Monica; Piccini, Mauro; Lubrano, Pasquale; Costantini, Flavio; Giorgi, Marcello; Giudici, Sergio; Lari, Enrico; Pinzino, Jacopo; Lamanna, Gianluca; Pedreschi, Elena; Sozzi, Marco; Mannelli, Italo; Fantechi, Riccardo; Spinella, Franco; Raggi, Mauro; Biagioni, Andrea; Lonardo, Alessandro; Vicini, Piero; Cretaro, Paolo; Turisini, Matteo; Frezza, Ottorino; Ammendola, Roberto; Bonaiuto, Vincenzo; Fucci, Adolfo; Salamon, Andrea; Sargeni, Fausto; Arcidiacono, Roberta; Bloch-Devaux, Brigitte; Menichetti, Ezio; Migliore, Ernesto; Biino, Cristina; Filippi, Alessandra; Marchetto, Flavio; Soldi, Dario; Engelfried, Jürgen; Briano Olvera, Alejandro; Estrada-Tristan, Nora; Reyes Santos, Marco Antonio; Piandani, Roberto; Rodriguez Rivera, Kevin Alexander; Boboc, Petre; Bragadireanu, Alexandru Mario; Ghinescu, Stefan Alexandru; Hutanu, Ovidiu Emanuel; Enik, Temur; Falaleev, Valeri; Kekelidze, Vladimir; Korotkova, Anna; Madigozhin, Dmitry; Misheva, Milena; Molokanova, Natalia; Kereibay, Dias; Polenkevich, Irina; Potrebenikov, Yuri; Shkarovskiy, Sergey; Baeva, Aigul; Baigarashev, Dosbol; Emelyanov, Dmitry; Litov, Leandar; Fedotov, Sergei; Khotyantsev, Alexey; Gorshanov, Konstantin; Gushchin, Evgeny; Kudenko, Yury; Kurochka, Viktoriia; Mefodev, Aleksandr; Kholodenko, Sergey; Kurshetsov, Viktor; Obraztsov, Vladimir; Okhotnikov, Artem; Sadovskiy, Alexander; Sugonyaev, Valentin; Yushchenko, Oleg; Blazek, Tomas; Cerny, Vladimir; Kucerova, Zuzana; Volpe, Roberta; Ceccucci, Augusto; Bernhard, Johannes; Bician, Lubos; Boretto, Marco; Corvino, Michele; Danielsson, Hans; Mukhamejanov, Yerzhan; Mukhamejanova, Assel; Saduyev, Nurzhan; Sakhiyev, Sayabek; Zamkovsky, Michal; Duval, Francois; Federici, Luca; Gamberini, Enrico; Guida, Roberto; Holzer, Eva Barbara; Jenninger, Berthold; Lehmann Miotto, Giovanna; Lichard, Peter; Massri, Karim; Minucci, Elisa; Noy, Matthew; Ryjov, Vladimir; Swallow, Joel; Chang, Xiafei; Marchevski, Radoslav; Kleimenova, Alina; Goudzovski, Evgueni; Henshaw, Jack; Tomczak, Adam; Lazzeroni, Cristina; Fry, John Richard; Gonnella, Francesco; Parkinson, Christopher; Romano, Angela; Sanders, Jack; Sam, Ceyhan; Kenworthy, Chandler; Sergi, Antonino; Shaikhiev, Artur; Heath, Helen; Britton, David; Norton, Alan; Protopopescu, Dan; Gatignon, Lau; Jones, Roger William Lewis; Dainton, John Bourke; Cooper, Peter; Coward, David; Rubin, Philip David; Rosa, Ilaria; Bautin, Vitalii; Salamatin, Kirill; Velas, Tomas; Francesconi, Marco |
| Contributors: |
Centre de Physique des Particules de Marseille (CPPM); Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS); NA62; ANR-19-CE31-0009,ENTER,Amélioration du tagging et de la reconstruction de l'énergie des neutrinos(2019) |
| Source: |
ISSN: 1126-6708. |
| Publisher Information: |
CCSD; Springer |
| Publication Year: |
2025 |
| Collection: |
Aix-Marseille Université: HAL |
| Subject Terms: |
Branching fraction; Rare Decay; Flavour Physics; Other Experiments; [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] |
| Description: |
International audience ; A measurement of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay by the NA62 experiment at the CERN SPS is presented, using data collected in 2021 and 2022. This dataset was recorded, after modifications to the beamline and detectors, at a higher instantaneous beam intensity with respect to the 2016--2018 data taking. Combining NA62 data collected in 2016--2022, a measurement of $B(K^{+}\rightarrow\pi^{+}\nu\bar{\nu}) = \left( 13.0^{+ 3.3}_{- 3.0} \right)\times10^{-11}$ is reported. With $51$ signal candidates observed and an expected background of $18^{+3}_{-2}$ events, $B(K^{+}\rightarrow\pi^{+}\nu\bar{\nu})$ becomes the smallest branching ratio measured with a signal significance above $5\,\sigma$. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/arxiv/2412.12015; ARXIV: 2412.12015; INSPIRE: 2860356 |
| DOI: |
10.1007/JHEP02(2025)191 |
| Availability: |
https://hal.science/hal-04846217; https://doi.org/10.1007/JHEP02(2025)191 |
| Accession Number: |
edsbas.2D82D20A |
| Database: |
BASE |