Searches for lepton number violating K+ decays

The NA62 Collaboration

doi:10.1016/j.physletb.2019.07.041

Searches for lepton number violating K⁺ decays

The NA62 Collaboration

Research output: Contribution to journal › Article (Academic Journal) › peer-review

54 Citations (Scopus)

Abstract

The NA62 experiment at CERN reports a search for the lepton number violating decays K⁺ → π^-e⁺e⁺ and K⁺ → π^-μ⁺μ⁺using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 ×10^-10 and 4.2 × 10^-11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

Original language	English
Article number	134794
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	797
DOIs	https://doi.org/10.1016/j.physletb.2019.07.041
Publication status	Published - 10 Oct 2019

Bibliographical note

Funding Information:
The cost of the experiment and its auxiliary systems was 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 Canada ) contribution to TRIUMF , Canada; MEYS ( Ministry of Education, Youth and Sports ), Czech Republic; BMBF ( Bundesministerium für Bildung und Forschung ) contracts 05H12UM5 , 05H15UMCNA and 05H18UMCNA , 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 of the Slovak Republic ), 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.

Funding Information:
Individuals have received support from: Charles University Research Center ( UNCE/SCI/013 ), 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 and starting grant 802836 “AxScale”).

Publisher Copyright:
© 2019 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license.

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@article{21e0f16ad9924e16b5b6a790f2b29a7a,

title = "Searches for lepton number violating K+ decays",

abstract = "The NA62 experiment at CERN reports a search for the lepton number violating decays K+ → π-e+e+ and K+ → π-μ+μ+using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 ×10-10 and 4.2 × 10-11 are obtained, respectively, at 90\% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.",

author = "\{The NA62 Collaboration\} and \{Cortina Gil\}, E. and A. Kleimenova and E. Minucci and S. Padolski and A. Shaikhiev and R. Volpe and T. Numao and Y. Petrov and B. Velghe and D. Bryman and T. Husek and J. Jerhot and K. Kampf and M. Zamkovsky and R. Aliberti and G. Khoriauli and J. Kunze and D. Lomidze and L. Peruzzo and M. Vormstein and R. Wanke and P. Dalpiaz and M. Fiorini and I. Neri and A. Norton and F. Petrucci and H. Wahl and H. Heath and R. Page and S. Trilov",

note = "Funding Information: The cost of the experiment and its auxiliary systems was 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 Canada ) contribution to TRIUMF , Canada; MEYS ( Ministry of Education, Youth and Sports ), Czech Republic; BMBF ( Bundesministerium f{\"u}r Bildung und Forschung ) contracts 05H12UM5 , 05H15UMCNA and 05H18UMCNA , Germany; INFN ( Istituto Nazionale di Fisica Nucleare ), Italy; MIUR ( Ministero dell'Istruzione, dell'Universit{\`a} e della Ricerca ), Italy; CONACyT ( Consejo Nacional de Ciencia y Tecnolog{\'i}a ), 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 of the Slovak Republic ), 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. Funding Information: Individuals have received support from: Charles University Research Center ( UNCE/SCI/013 ), 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 and starting grant 802836 “AxScale”). Publisher Copyright: {\textcopyright} 2019 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license.",

year = "2019",

month = oct,

day = "10",

doi = "10.1016/j.physletb.2019.07.041",

language = "English",

volume = "797",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Searches for lepton number violating K+ decays

AU - The NA62 Collaboration

AU - Cortina Gil, E.

AU - Kleimenova, A.

AU - Minucci, E.

AU - Padolski, S.

AU - Shaikhiev, A.

AU - Volpe, R.

AU - Numao, T.

AU - Petrov, Y.

AU - Velghe, B.

AU - Bryman, D.

AU - Husek, T.

AU - Jerhot, J.

AU - Kampf, K.

AU - Zamkovsky, M.

AU - Aliberti, R.

AU - Khoriauli, G.

AU - Kunze, J.

AU - Lomidze, D.

AU - Peruzzo, L.

AU - Vormstein, M.

AU - Wanke, R.

AU - Dalpiaz, P.

AU - Fiorini, M.

AU - Neri, I.

AU - Norton, A.

AU - Petrucci, F.

AU - Wahl, H.

AU - Heath, H.

AU - Page, R.

AU - Trilov, S.

N1 - Funding Information: The cost of the experiment and its auxiliary systems was 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 Canada ) contribution to TRIUMF , Canada; MEYS ( Ministry of Education, Youth and Sports ), Czech Republic; BMBF ( Bundesministerium für Bildung und Forschung ) contracts 05H12UM5 , 05H15UMCNA and 05H18UMCNA , 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 of the Slovak Republic ), 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. Funding Information: Individuals have received support from: Charles University Research Center ( UNCE/SCI/013 ), 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 and starting grant 802836 “AxScale”). Publisher Copyright: © 2019 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license.

PY - 2019/10/10

Y1 - 2019/10/10

N2 - The NA62 experiment at CERN reports a search for the lepton number violating decays K+ → π-e+e+ and K+ → π-μ+μ+using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 ×10-10 and 4.2 × 10-11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

AB - The NA62 experiment at CERN reports a search for the lepton number violating decays K+ → π-e+e+ and K+ → π-μ+μ+using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 ×10-10 and 4.2 × 10-11 are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively.

UR - https://www.scopus.com/pages/publications/85069869698

U2 - 10.1016/j.physletb.2019.07.041

DO - 10.1016/j.physletb.2019.07.041

M3 - Article (Academic Journal)

AN - SCOPUS:85069869698

SN - 0370-2693

VL - 797

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 134794

ER -