Observation of the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay and measurement of its branching ratio

Observation of the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ decay and measurement of its branching ratio

Abstract A measurement of the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ 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 in...

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Main Authors: The NA62 collaboration, E. Cortina Gil, J. Jerhot, N. Lurkin, T. Numao, B. Velghe, V. W. S. Wong, D. Bryman, Z. Hives, T. Husek, K. Kampf, M. Kolesar, M. Koval, B. De Martino, M. Perrin-Terrin, L. Petit, B. Döbrich, S. Lezki, J. Schubert, A. T. Akmete, R. Aliberti, M. Ceoletta, L. Di Lella, N. Doble, L. Peruzzo, C. Polivka, S. Schuchmann, H. Wahl, R. Wanke, P. Dalpiaz, R. Negrello, I. Neri, F. Petrucci, M. Soldani, L. Bandiera, N. Canale, A. Cotta Ramusino, A. Gianoli, M. Romagnoni, A. Sytov, M. Lenti, P. Lo Chiatto, I. Panichi, G. Ruggiero, A. Bizzeti, F. Bucci, A. Antonelli, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, M. D’Errico, R. Fiorenza, M. Francesconi, R. Giordano, P. Massarotti, M. Mirra, M. Napolitano, I. Rosa, G. Saracino, G. Anzivino, P. Cenci, V. Duk, R. Lollini, P. Lubrano, M. Pepe, M. Piccini, F. Costantini, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, J. Pinzino, M. Sozzi, R. Fantechi, F. Spinella, I. Mannelli, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, A. Lonardo, M. Turisini, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, E. Menichetti, E. Migliore, C. Biino, A. Filippi, F. Marchetto, D. Soldi, Y. Mukhamejanov, A. Mukhamejanova, N. Saduyev, S. Sakhiyev, A. Briano Olvera, J. Engelfried, N. Estrada-Tristan, R. Piandani, M. A. Reyes Santos, K. A. Rodriguez Rivera, P. Boboc, A. M. Bragadireanu, S. A. Ghinescu, O. E. Hutanu, T. Blazek, V. Cerny, T. Velas, R. Volpe, J. Bernhard, L. Bician, M. Boretto, F. Brizioli, A. Ceccucci, M. Corvino, H. Danielsson, F. Duval, L. Federici, E. Gamberini, R. Guida, E. B. Holzer, B. Jenninger, Z. Kucerova, G. Lehmann Miotto, P. Lichard, K. Massri, E. Minucci, M. Noy, V. Ryjov, J. Swallow, M. Zamkovsky, X. Chang, A. Kleimenova, R. Marchevski, J. R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, C. Kenworthy, C. Lazzeroni, C. Parkinson, A. Romano, C. Sam, J. Sanders, A. Sergi, A. Shaikhiev, A. Tomczak, H. Heath, D. Britton, A. Norton, D. Protopopescu, J. B. Dainton, L. Gatignon, R. W. L. Jones, P. Cooper, D. Coward, P. Rubin, A. Baeva, D. Baigarashev, V. Bautin, D. Emelyanov, T. Enik, V. Falaleev, V. Kekelidze, D. Kereibay, A. Korotkova, L. Litov, D. Madigozhin, M. Misheva, N. Molokanova, I. Polenkevich, Yu. Potrebenikov, K. Salamatin, S. Shkarovskiy, S. Fedotov, K. Gorshanov, E. Gushchin, S. Kholodenko, A. Khotyantsev, Y. Kudenko, V. Kurochka, V. Kurshetsov, A. Mefodev, V. Obraztsov, A. Okhotnikov, A. Sadovskiy, V. Sugonyaev, O. Yushchenko
Format: Article
Language:English
Published: SpringerOpen 2025-02-01
Series:Journal of High Energy Physics
Subjects:
Branching fraction
Rare Decay
Flavour Physics
Other Experiments
Online Access:https://doi.org/10.1007/JHEP02(2025)191
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Summary:Abstract A measurement of the K + → π + ν ν ¯ $$ {K}^{+}\to {\pi}^{+}\nu \overline{\nu} $$ 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 + → π + ν ν ¯ = 13.0 − 3.0 + 3.3 × 10 − 11 $$ \mathcal{B}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right)=\left({13.0}_{-3.0}^{+3.3}\right)\times {10}^{-11} $$ is reported. With 51 signal candidates observed and an expected background of 18 − 2 + 3 $$ {18}_{-2}^{+3} $$ events, B K + → π + ν ν ¯ $$ \mathcal{B}\left({K}^{+}\to {\pi}^{+}\nu \overline{\nu}\right) $$ becomes the smallest branching ratio measured with a signal significance above 5σ.
ISSN:1029-8479

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