Observation of the K+→π+νν¯ decay and measurement of its branching ratio
Cortina Gil E. Jerhot J. Lurkin N. Numao T. Velghe B. Wong V.W.S. Bryman D. Hives Z. Husek T. Kampf K. Kolesar M. Koval M. De Martino B. Perrin-Terrin M. Petit L. Döbrich B. Lezki S. Schubert J. Akmete A.T. Aliberti R. Ceoletta M. Di Lella L. Doble N. Peruzzo L. Polivka C. Schuchmann S. Wahl H. Wanke R. Dalpiaz P. Negrello R. Neri I. Petrucci F. Soldani M. Bandiera L. Canale N. Cotta Ramusino A. Gianoli A. Romagnoni M. Sytov A. Lenti M. Lo Chiatto P. Panichi I. Ruggiero G. Bizzeti A. Bucci F. Antonelli A. Kozhuharov V. Lanfranchi G. Martellotti S. Moulson M. Spadaro T. Tinti G. Ambrosino F. D’Errico M. Fiorenza R. Francesconi M. Giordano R. Massarotti P. Mirra M. Napolitano M. Rosa I. Saracino G. Anzivino G. Cenci P. Duk V. Lollini R. Lubrano P. Pepe M. Piccini M. Costantini F. Giorgi M. Giudici S. Lamanna G. Lari E. Pedreschi E. Pinzino J. Sozzi M. Fantechi R. Spinella F. Mannelli I. Raggi M. Biagioni A. Cretaro P. Frezza O. Lonardo A. Turisini M. Vicini P. Ammendola R. Bonaiuto V. Fucci A. Salamon A. Sargeni F. Arcidiacono R. Bloch-Devaux B. Menichetti E. Migliore E. Biino C. Filippi A. Marchetto F. Soldi D. Mukhamejanov Y. Mukhamejanova A. Saduyev N. Sakhiyev S. Briano Olvera A. Engelfried J. Estrada-Tristan N. Piandani R. Reyes Santos M.A. Rodriguez Rivera K.A. Boboc P. Bragadireanu A.M. Ghinescu S.A. Hutanu O.E. Blazek T. Cerny V. Velas T. Volpe R. Bernhard J. Bician L. Boretto M. Brizioli F. Ceccucci A. Corvino M. Danielsson H. Duval F. Federici L. Gamberini E. Guida R. Holzer E.B. Jenninger B. Kucerova Z. Lehmann Miotto G. Lichard P. Massri K. Minucci E. Noy M. Ryjov V. Swallow J. Zamkovsky M. Chang X. Kleimenova A. Marchevski R. Fry J.R. Gonnella F. Goudzovski E. Henshaw J. Kenworthy C. Lazzeroni C. Parkinson C. Romano A. Sam C. Sanders J. Sergi A. Shaikhiev A. Tomczak A. Heath H. Britton D. Norton A. Protopopescu D. Dainton J.B. Gatignon L. Jones R.W.L. Cooper P. Coward D. Rubin P. Baeva A. Baigarashev D. Bautin V. Emelyanov D. Enik T. Falaleev V. Kekelidze V. Kereibay D. Korotkova A. Litov L. Madigozhin D. Misheva M. Molokanova N. Polenkevich I. Potrebenikov Y. Salamatin K. Shkarovskiy S. Fedotov S. Gorshanov K. Gushchin E. Kholodenko S. Khotyantsev A. Kudenko Y. Kurochka V. Kurshetsov V. Mefodev A. Obraztsov V. Okhotnikov A. Sadovskiy A. Sugonyaev V. Yushchenko O.
February 2025Springer Science and Business Media Deutschland GmbH
Journal of High Energy Physics
2025#2025Issue 2
A measurement of the K+→π+νν¯ 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 BK+→π+νν¯=13.0−3.0+3.3×10−11 is reported. With 51 signal candidates observed and an expected background of 18−2+3 events, BK+→π+νν¯ becomes the smallest branching ratio measured with a signal significance above 5σ.
Branching fraction , Flavour Physics , Other Experiments , Rare Decay
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Université Catholique de Louvain, Louvain-La-Neuve, B-1348, Belgium
TRIUMF, Vancouver, V6T 2A3, BC, Canada
University of British Columbia, Vancouver, BC, Canada
Charles University, Prague 1, 116 36, Czech Republic
Aix Marseille University, CNRS/IN2P3, CPPM, Marseille, France
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Garching, D-85748, Germany
Institut für Physik and PRISMA Cluster of Excellence, Universität Mainz, Mainz, Germany
Dipartimento di Fisica e Scienze della Terra dell’Università e INFN, Sezione di Ferrara, Ferrara, Italy
INFN, Sezione di Ferrara, Ferrara, Italy
Dipartimento di Fisica e Astronomia dell’Università e INFN, Sezione di Firenze, Sesto Fiorentino, Italy
INFN, Sezione di Firenze, Sesto Fiorentino, Italy
Laboratori Nazionali di Frascati, Frascati, I-00044, Italy
Dipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, Italy
Dipartimento di Fisica e Geologia dell’Università e INFN, Sezione di Perugia, Perugia, Italy
INFN, Sezione di Perugia, Perugia, I-06100, Italy
Dipartimento di Fisica dell’Università e INFN, Sezione di Pisa, Pisa, Italy
INFN, Sezione di Pisa, Pisa, I-56100, Italy
Scuola Normale Superiore e INFN, Sezione di Pisa, Pisa, Italy
Dipartimento di Fisica, Sapienza Università di Roma e INFN, Sezione di Roma I, Roma, Italy
INFN, Sezione di Roma I, Roma, Italy
INFN, Sezione di Roma Tor Vergata, Roma, Italy
Dipartimento di Fisica dell’Università e INFN, Sezione di Torino, Torino, Italy
INFN, Sezione di Torino, Torino, Italy
Institute of Nuclear Physics, Almaty, Kazakhstan
Instituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
Horia Hulubei National Institute for R & D in Physics and Nuclear Engineering, Bucharest-Magurele, Romania
Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
CERN, European Organization for Nuclear Research, Geneva 23, CH-1211, Switzerland
Ecole Polytechnique Fédérale Lausanne, Lausanne, Switzerland
School of Physics and Astronomy, University of Birmingham, Birmingham, B15 2TT, United Kingdom
School of Physics, University of Bristol, Bristol, United Kingdom
School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
Physics Department, University of Lancaster, Lancaster, LA1 4YB, United Kingdom
Physics and Astronomy Department, George Mason University, Fairfax, VA, United States
Université de Toulon, Aix Marseille University, CNRS, IM2NP, La Garde, F-83957, France
Department of Physics, Technical University of Munich, München, D-80333, Germany
Institut für Kernphysik and Helmholtz Institute Mainz, Universität Mainz, Mainz, D-55099, Germany
Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Università di Modena e Reggio Emilia, Modena, I-41125, Italy
Faculty of Physics, University of Sofia, Sofia, BG-1164, Bulgaria
Scuola Superiore Meridionale e INFN, Sezione di Napoli, Napoli, I-80138, Italy
Department of Industrial Engineering, University of Roma Tor Vergata, Roma, I-00173, Italy
Department of Electronic Engineering, University of Roma Tor Vergata, Roma, I-00173, Italy
Università degli Studi del Piemonte Orientale, Vercelli, I-13100, Italy
Gran Sasso Science Institute, L’Aquila, I-67100, Italy
Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Universidad de Guanajuato, Guanajuato, 36000, Mexico
Syracuse University, Syracuse, 13244, NY, United States
Dipartimento di Fisica dell’Università e INFN, Sezione di Genova, Genova, I-16146, Italy
SLAC National Accelerator Laboratory, Stanford University, Menlo Park, 94025, CA, United States
L. N. Gumilyov Eurasian National University, Nur-Sultan, 010000, Kazakhstan
Institute of Nuclear Research and Nuclear Energy of Bulgarian Academy of Science (INRNE-BAS), Sofia, BG-1784, Bulgaria
Université Catholique de Louvain
TRIUMF
University of British Columbia
Charles University
Aix Marseille University
Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)
Institut für Physik and PRISMA Cluster of Excellence
Dipartimento di Fisica e Scienze della Terra dell’Università e INFN
INFN
Dipartimento di Fisica e Astronomia dell’Università e INFN
INFN
Laboratori Nazionali di Frascati
Dipartimento di Fisica “Ettore Pancini” e INFN
Dipartimento di Fisica e Geologia dell’Università e INFN
INFN
Dipartimento di Fisica dell’Università e INFN
INFN
Scuola Normale Superiore e INFN
Dipartimento di Fisica
INFN
INFN
Dipartimento di Fisica dell’Università e INFN
INFN
Institute of Nuclear Physics
Instituto de Física
Horia Hulubei National Institute for R & D in Physics and Nuclear Engineering
Faculty of Mathematics
CERN
Ecole Polytechnique Fédérale Lausanne
School of Physics and Astronomy
School of Physics
School of Physics and Astronomy
Physics Department
Physics and Astronomy Department
Université de Toulon
Department of Physics
Institut für Kernphysik and Helmholtz Institute Mainz
Dipartimento di Scienze Fisiche
Faculty of Physics
Scuola Superiore Meridionale e INFN
Department of Industrial Engineering
Department of Electronic Engineering
Università degli Studi del Piemonte Orientale
Gran Sasso Science Institute
Al-Farabi Kazakh National University
Universidad de Guanajuato
Syracuse University
Dipartimento di Fisica dell’Università e INFN
SLAC National Accelerator Laboratory
L. N. Gumilyov Eurasian National University
Institute of Nuclear Research and Nuclear Energy of Bulgarian Academy of Science (INRNE-BAS)
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