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Observation of the K+→π+νν¯ decay and measurement of its branching ratio

by Martellotti, S. , Ceccucci, A. , Polivka, C. , Doble, N. , Bautin, V. , Kudenko, Y. , Guida, R. , Frezza, O. , Coward, D. , Lehmann Miotto, G. , Kampf, K. , Wanke, R. , Döbrich, B. , Lezki, S. , Lanfranchi, G. , Obraztsov, V. , Emelyanov, D. , Soldi, D. , Akmete, A. T. , Duval, F. , Federici, L. , Kleimenova, A. , Kekelidze, V. , Mirra, M. , Saracino, G. , Sozzi, M. , Potrebenikov, Yu , Biino, C. , Korotkova, A. , Cortina Gil, E. , Bonaiuto, V. , Husek, T. , Holzer, E. B. , Lurkin, N. , Swallow, J. , Kenworthy, C. , Massarotti, P. , Polenkevich, I. , Pepe, M. , Lubrano, P. , Goudzovski, E. , Velghe, B. , Fucci, A. , Parkinson, C. , Velas, T. , Filippi, A. , Cotta Ramusino, A. , Tinti, G. , Numao, T. , Lamanna, G. , Petit, L. , Blazek, T. , Baeva, A. , Molokanova, N. , Romano, A. , Giordano, R. , Litov, L. , Salamatin, K. , Perrin-Terrin, M. , Okhotnikov, A. , Sergi, A. , Sugonyaev, V. , Fedotov, S. , Wong, V. W. S. , Khotyantsev, A. , De Martino, B. , Vicini, P. , Boretto, M. , Biagioni, A. , Bragadireanu, A. M. , Napolitano, M. , Boboc, P. , Anzivino, G. , Pedreschi, E. , Minucci, E. , Norton, A. , Marchetto, F. , Hutanu, O. E. , Ryjov, V. , Piandani, R. , Sam, C. , Koval, M. , Menichetti, E. , D’Errico, M. , Brizioli, F. , Cooper, P.

in Atoms & subatomic particles / Charged particles / Classical and Quantum Gravitation / Collaboration / Datasets / Decay / Elementary Particles / High energy physics / Physics / Physics and Astronomy / Quantum Field Theories / Quantum Field Theory / Quantum Physics / Quarks / Regular Article - Experimental Physics / Relativity Theory / Sensors / String Theory

2025

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Observation of the K+→π+νν¯ decay and measurement of its branching ratio

2025

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Observation of the K+→π+νν¯ decay and measurement of its branching ratio

2025

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Journal Article

Observation of the K+→π+νν¯ decay and measurement of its branching ratio

Martellotti, S.,

Ceccucci, A.,

Polivka, C.,

Doble, N.,

Bautin, V.,

Kudenko, Y.,

Guida, R.,

Frezza, O.,

Coward, D.,

Lehmann Miotto, G.,

Kampf, K.,

Wanke, R.,

Döbrich, B.,

Lezki, S.,

Lanfranchi, G.,

Obraztsov, V.,

Emelyanov, D.,

Soldi, D.,

Akmete, A. T.,

Duval, F.,

Federici, L.,

Kleimenova, A.,

Kekelidze, V.,

Mirra, M.,

Saracino, G.,

Sozzi, M.,

Potrebenikov, Yu,

Biino, C.,

Korotkova, A.,

Cortina Gil, E.,

Bonaiuto, V.,

Husek, T.,

Holzer, E. B.,

Lurkin, N.,

Swallow, J.,

Kenworthy, C.,

Massarotti, P.,

Polenkevich, I.,

Pepe, M.,

Lubrano, P.,

Goudzovski, E.,

Velghe, B.,

Fucci, A.,

Parkinson, C.,

Velas, T.,

Filippi, A.,

Cotta Ramusino, A.,

Tinti, G.,

Numao, T.,

Lamanna, G.,

Petit, L.,

Blazek, T.,

Baeva, A.,

Molokanova, N.,

Romano, A.,

Giordano, R.,

Litov, L.,

Salamatin, K.,

Perrin-Terrin, M.,

Okhotnikov, A.,

Sergi, A.,

Sugonyaev, V.,

Fedotov, S.,

Wong, V. W. S.,

Khotyantsev, A.,

De Martino, B.,

Vicini, P.,

Boretto, M.,

Biagioni, A.,

Bragadireanu, A. M.,

Napolitano, M.,

Boboc, P.,

Anzivino, G.,

Pedreschi, E.,

Minucci, E.,

Norton, A.,

Marchetto, F.,

Hutanu, O. E.,

Ryjov, V.,

Piandani, R.,

Sam, C.,

Koval, M.,

Menichetti, E.,

D’Errico, M.,

Brizioli, F.,

Cooper, P.

2025

Overview

A bstract A measurement of the K + → π + ν ν ¯ 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 is reported. With 51 signal candidates observed and an expected background of 18 − 2 + 3 events, B K + → π + ν ν ¯ becomes the smallest branching ratio measured with a signal significance above 5 σ .

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Publisher

Springer Berlin Heidelberg,Springer Nature B.V

Subject

Atoms & subatomic particles

/ Charged particles

/ Classical and Quantum Gravitation

/ Collaboration

/ Datasets

/ Decay

/ Elementary Particles