First search for K+→π+νν¯ using the decay-in-flight technique

The NA62 Collaboration

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84 Citations (Scopus)

Abstract

The NA62 experiment at the CERN SPS reports the first search for K+→π+νν¯ using the decay-in-flight technique, based on a sample of 1.21×1011 K+ decays collected in 2016. The single event sensitivity is 3.15×10−10, corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14×10−10 on the K+→π+νν¯ branching ratio at 95% CL.

Original languageEnglish
Pages (from-to)156-166
Number of pages11
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume791
DOIs
Publication statusPublished - 10 Apr 2019

Bibliographical note

Funding Information:
Individuals have received support from: Charles University (project GA UK number 404716 ), Czech Republic; Ministry of Education, Universities and Research ( MIUR “Futuro in ricerca 2012” grant RBFR12JF2Z , Project GAP), Italy; Russian Foundation for Basic Research (RFBR grants 18-32-00072 , 18-32-00245 ), Russia; the Royal Society (grants UF100308 , UF0758946 ), United Kingdom; STFC (Rutherford fellowships ST/J00412X/1 , ST/M005798/1 ), United Kingdom; ERC (grants 268062 , 336581 ).

Funding Information:
The cost of the experiment and of its auxiliary systems were supported by the funding agencies of the Collaboration Institutes. We are particularly indebted to: F.R.S.-FNRS (Fonds de la Recherche Scientifique - FNRS), Belgium; BMES (Ministry of Education, Youth and Science), Bulgaria; NSERC (Natural Sciences and Engineering Research Council), Canada; NRC (National Research Council) contribution to TRIUMF, Canada; MEYS (Ministry of Education, Youth and Sports), Czech Republic; BMBF (Bundesministerium für Bildung und Forschung) contracts 05H12UM5 and 05H15UMCNA, Germany; INFN (Istituto Nazionale di Fisica Nucleare), Italy; MIUR (Ministero dell'Istruzione, dell'Università e della Ricerca), Italy; CONACyT (Consejo Nacional de Ciencia y Tecnología), Mexico; IFA (Institute of Atomic Physics), Romania; INR-RAS (Institute for Nuclear Research of the Russian Academy of Sciences), Moscow, Russia; JINR (Joint Institute for Nuclear Research), Dubna, Russia; NRC (National Research Center) “Kurchatov Institute” and MESRF (Ministry of Education and Science of the Russian Federation), Russia; MESRS (Ministry of Education, Science, Research and Sport), Slovakia; CERN (European Organization for Nuclear Research), Switzerland; STFC (Science and Technology Facilities Council), United Kingdom; NSF (National Science Foundation) Award Number 1506088, U.S.A.; ERC (European Research Council) “UniversaLepto” advanced grant 268062, “KaonLepton” starting grant 336581, Europe.Individuals have received support from: Charles University (project GA UK number 404716), Czech Republic; Ministry of Education, Universities and Research (MIUR “Futuro in ricerca 2012” grant RBFR12JF2Z, Project GAP), Italy; Russian Foundation for Basic Research (RFBR grants 18-32-00072, 18-32-00245), Russia; the Royal Society (grants UF100308, UF0758946), United Kingdom; STFC (Rutherford fellowships ST/J00412X/1, ST/M005798/1), United Kingdom; ERC (grants 268062, 336581).

Funding Information:
The cost of the experiment and of its auxiliary systems were supported by the funding agencies of the Collaboration Institutes. We are particularly indebted to: F.R.S.-FNRS ( Fonds de la Recherche Scientifique - FNRS ), Belgium; BMES ( Ministry of Education, Youth and Science ), Bulgaria; NSERC (Natural Sciences and Engineering Research Council), Canada; NRC ( National Research Council ) contribution to TRIUMF , Canada; MEYS ( Ministry of Education, Youth and Sports ), Czech Republic; BMBF ( Bundesministerium für Bildung und Forschung ) contracts 05H12UM5 and 05H15UMCNA , Germany; INFN (Istituto Nazionale di Fisica Nucleare), Italy; MIUR ( Ministero dell'Istruzione, dell'Università e della Ricerca ), Italy; CONACyT ( Consejo Nacional de Ciencia y Tecnología ), Mexico; IFA (Institute of Atomic Physics), Romania; INR-RAS (Institute for Nuclear Research of the Russian Academy of Sciences ), Moscow, Russia; JINR ( Joint Institute for Nuclear Research ), Dubna, Russia; NRC (National Research Center) “Kurchatov Institute” and MESRF ( Ministry of Education and Science of the Russian Federation ), Russia; MESRS ( Ministry of Education , Science, Research and Sport), Slovakia; CERN (European Organization for Nuclear Research), Switzerland; STFC ( Science and Technology Facilities Council ), United Kingdom; NSF (National Science Foundation) Award Number 1506088 , U.S.A.; ERC ( European Research Council ) “UniversaLepto” advanced grant 268062 , “KaonLepton” starting grant 336581 , Europe.

Publisher Copyright:
© 2019 The Author

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