Searches for lepton flavour and lepton number violation in K+ decays at NA62

Joel Swallow; R. Aliberti; F. Ambrosino; R. Ammendola; B. Angelucci; A. Antonelli; G. Anzivino; R. Arcidiacono; T. Bache; A. Baeva; D. Baigarashev; M. Barbanera; J. Bernhard; A. Biagioni; L. Bician; C. Biino; A. Bizzeti; T. Blazek; B. Bloch-Devaux; V. Bonaiuto; M. Boretto; M. Bragadireanu; D. Britton; F. Brizioli; M. B. Brunetti; D. Bryman; F. Bucci; T. Capussela; J. Carmignani; A. Ceccucci; P. Cenci; V. Cerny; C. Cerri; B. Checcucci; A. Conovaloff; P. Cooper; E. Cortina Gil; M. Corvino; F. Costantini; A. Cotta Ramusino; D. Coward; G. D'Agostini; J. Dainton; P. Dalpiaz; H. Danielsson; N. de Simone; D. Di Filippo; L. Di Lella; N. Doble; B. Dobrich; F. Duval; V. Duk; D. Emelyanov; J. Engelfried; T. Enik; N. Estrada-Tristan; V. Falaleev; R. Fantechi; V. Fascianelli; L. Federici; S. Fedotov; A. Filippi; M. Fiorini; J. Fry; J. Fu; A. Fucci; L. Fulton; E. Gamberini; L. Gatignon; G. Georgiev; S. Ghinescu; A. Gianoli; M. Giorgi; S. Giudici; F. Gonnella; E. Goudzovski; C. Graham; R. Guida; E. Gushchin; F. Hahn; H. Heath; J. Henshaw; E. B. Holzer; T. Husek; O. Hutanu; D. Hutchcroft; L. Iacobuzio; E. Iacopini; E. Imbergamo; B. Jenninger; J. Jerhot; R. W. Jones; K. Kampf; V. Kekelidze; S. Kholodenko; G. Khoriauli; A. Khotyantsev; A. Kleimenova; A. Korotkova; M. Koval; V. Kozhuharov; Z. Kucerova; Y. Kudenko; J. Kunze; V. Kurochka; V. Kurshetsov; G. Lanfranchi; G. Lamanna; E. Lari; G. Latino; P. Laycock; C. Lazzeroni; M. Lenti; G. Lehmann Miotto; E. Leonardi; P. Lichard; L. Litov; R. Lollini; D. Lomidze; A. Lonardo; P. Lubrano; M. Lupi; N. Lurkin; D. Madigozhin; I. Mannelli; A. Mapelli; F. Marchetto; R. Marchevski; S. Martellotti; P. Massarotti; K. Massri; E. Maurice; M. Medvedeva; A. Mefodev; E. Menichetti; E. Migliore; E. Minucci; M. Mirra; M. Misheva; N. Molokanova; M. Moulson; S. Movchan; M. Napolitano; I. Neri; F. Newson; A. Norton; M. Noy; T. Numao; V. Obraztsov; A. Ostankov; S. Padolski; R. Page; V. Palladino; A. Parenti; C. Parkinson; E. Pedreschi; M. Pepe; M. Perrin-Terrin; L. Peruzzo; P. Petrov; Y. Petrov; F. Petrucci; R. Piandani; M. Piccini; J. Pinzino; I. Polenkevich; L. Pontisso; Yu Potrebenikov; D. Protopopescu; M. Raggi; A. Romano; P. Rubin; G. Ruggiero; V. Ryjov; A. Salamon; C. Santoni; G. Saracino; F. Sargeni; S. Schuchmann; V. Semenov; A. Sergi; A. Shaikhiev; S. Shkarovskiy; D. Soldi; V. Sugonyaev; M. Sozzi; T. Spadaro; F. Spinella; A. Sturgess; S. Trilov; P. Valente; B. Velghe; S. Venditti; P. Vicini; R. Volpe; M. Vormstein; H. Wahl; R. Wanke; B. Wrona; O. Yushchenko; M. Zamkovsky; A. Zinchenko

Searches for lepton flavour and lepton number violation in K⁺ decays at NA62

Joel Swallow
, R. Aliberti
, F. Ambrosino
, R. Ammendola
, B. Angelucci
, A. Antonelli
, G. Anzivino
, R. Arcidiacono
, T. Bache
, A. Baeva
, D. Baigarashev
, M. Barbanera
, J. Bernhard
, A. Biagioni
, L. Bician
, C. Biino
, A. Bizzeti
, T. Blazek
, B. Bloch-Devaux
, V. Bonaiuto

M. Boretto, M. Bragadireanu, D. Britton, F. Brizioli, M. B. Brunetti, D. Bryman, F. Bucci, T. Capussela, J. Carmignani, A. Ceccucci, P. Cenci, V. Cerny, C. Cerri, B. Checcucci, A. Conovaloff, P. Cooper, E. Cortina Gil, M. Corvino, F. Costantini, A. Cotta Ramusino, D. Coward, G. D'Agostini, J. Dainton, P. Dalpiaz, H. Danielsson, N. de Simone, D. Di Filippo, L. Di Lella, N. Doble, B. Dobrich, F. Duval, V. Duk, D. Emelyanov, J. Engelfried, T. Enik, N. Estrada-Tristan, V. Falaleev, R. Fantechi, V. Fascianelli, L. Federici, S. Fedotov, A. Filippi, M. Fiorini, J. Fry, J. Fu, A. Fucci, L. Fulton, E. Gamberini, L. Gatignon, G. Georgiev, S. Ghinescu, A. Gianoli, M. Giorgi, S. Giudici, F. Gonnella, E. Goudzovski, C. Graham, R. Guida, E. Gushchin, F. Hahn, H. Heath, J. Henshaw, E. B. Holzer, T. Husek, O. Hutanu, D. Hutchcroft, L. Iacobuzio, E. Iacopini, E. Imbergamo, B. Jenninger, J. Jerhot, R. W. Jones, K. Kampf, V. Kekelidze, S. Kholodenko, G. Khoriauli, A. Khotyantsev, A. Kleimenova, A. Korotkova, M. Koval, V. Kozhuharov, Z. Kucerova, Y. Kudenko, J. Kunze, V. Kurochka, V. Kurshetsov, G. Lanfranchi, G. Lamanna, E. Lari, G. Latino, P. Laycock, C. Lazzeroni, M. Lenti, G. Lehmann Miotto, E. Leonardi, P. Lichard, L. Litov, R. Lollini, D. Lomidze, A. Lonardo, P. Lubrano, M. Lupi, N. Lurkin, D. Madigozhin, I. Mannelli, A. Mapelli, F. Marchetto, R. Marchevski, S. Martellotti, P. Massarotti, K. Massri, E. Maurice, M. Medvedeva, A. Mefodev, E. Menichetti, E. Migliore, E. Minucci, M. Mirra, M. Misheva, N. Molokanova, M. Moulson, S. Movchan, M. Napolitano, I. Neri, F. Newson, A. Norton, M. Noy, T. Numao, V. Obraztsov, A. Ostankov, S. Padolski, R. Page, V. Palladino, A. Parenti, C. Parkinson, E. Pedreschi, M. Pepe, M. Perrin-Terrin, L. Peruzzo, P. Petrov, Y. Petrov, F. Petrucci, R. Piandani, M. Piccini, J. Pinzino, I. Polenkevich, L. Pontisso, Yu Potrebenikov, D. Protopopescu, M. Raggi, A. Romano, P. Rubin, G. Ruggiero, V. Ryjov, A. Salamon, C. Santoni, G. Saracino, F. Sargeni, S. Schuchmann, V. Semenov, A. Sergi, A. Shaikhiev, S. Shkarovskiy, D. Soldi, V. Sugonyaev, M. Sozzi, T. Spadaro, F. Spinella, A. Sturgess, S. Trilov, P. Valente, B. Velghe, S. Venditti, P. Vicini, R. Volpe, M. Vormstein, H. Wahl, R. Wanke, B. Wrona, O. Yushchenko, M. Zamkovsky, A. Zinchenko

University of Birmingham

Research output: Contribution to journal › Conference article › peer-review

Abstract

A search for the lepton number violating K⁺ ? p^-µ^+e+ and lepton flavour violating K⁺ ? p^-µ^-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90% confidence level: B(K⁺ ? p^-µ^+e+) < 4.2 × 10^-11 and B(K⁺ ? p⁺µ^-e+) < 6.6 × 10^-11. These results improve over the previous limits by factors of 12 and 8 respectively.

Original language	English
Article number	430
Journal	Proceedings of Science
Volume	390
Publication status	Published - 15 Apr 2021
Event	40th International Conference on High Energy Physics, ICHEP 2020 - Virtual, Prague, Czech Republic Duration: 28 Jul 2020 → 6 Aug 2020

Cite this

Swallow, J., Aliberti, R., Ambrosino, F., Ammendola, R., Angelucci, B., Antonelli, A., Anzivino, G., Arcidiacono, R., Bache, T., Baeva, A., Baigarashev, D., Barbanera, M., Bernhard, J., Biagioni, A., Bician, L., Biino, C., Bizzeti, A., Blazek, T., Bloch-Devaux, B., ... Zinchenko, A. (2021). Searches for lepton flavour and lepton number violation in K⁺ decays at NA62. Proceedings of Science, 390, Article 430.

@article{b5e14b85f0534e5c86dfa130bd37e7d9,

title = "Searches for lepton flavour and lepton number violation in K+ decays at NA62",

abstract = "A search for the lepton number violating K+ ? p-µ+e+ and lepton flavour violating K+ ? p-µ-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90\% confidence level: B(K+ ? p-µ+e+) < 4.2 × 10-11 and B(K+ ? p+µ-e+) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively.",

author = "Joel Swallow and R. Aliberti and F. Ambrosino and R. Ammendola and B. Angelucci and A. Antonelli and G. Anzivino and R. Arcidiacono and T. Bache and A. Baeva and D. Baigarashev and M. Barbanera and J. Bernhard and A. Biagioni and L. Bician and C. Biino and A. Bizzeti and T. Blazek and B. Bloch-Devaux and V. Bonaiuto and M. Boretto and M. Bragadireanu and D. Britton and F. Brizioli and Brunetti, \{M. B.\} and D. Bryman and F. Bucci and T. Capussela and J. Carmignani and A. Ceccucci and P. Cenci and V. Cerny and C. Cerri and B. Checcucci and A. Conovaloff and P. Cooper and Gil, \{E. Cortina\} and M. Corvino and F. Costantini and Ramusino, \{A. Cotta\} and D. Coward and G. D'Agostini and J. Dainton and P. Dalpiaz and H. Danielsson and \{de Simone\}, N. and \{Di Filippo\}, D. and \{Di Lella\}, L. and N. Doble and B. Dobrich and F. Duval and V. Duk and D. Emelyanov and J. Engelfried and T. Enik and N. Estrada-Tristan and V. Falaleev and R. Fantechi and V. Fascianelli and L. Federici and S. Fedotov and A. Filippi and M. Fiorini and J. Fry and J. Fu and A. Fucci and L. Fulton and E. Gamberini and L. Gatignon and G. Georgiev and S. Ghinescu and A. Gianoli and M. Giorgi and S. Giudici and F. Gonnella and E. Goudzovski and C. Graham and R. Guida and E. Gushchin and F. Hahn and H. Heath and J. Henshaw and Holzer, \{E. B.\} and T. Husek and O. Hutanu and D. Hutchcroft and L. Iacobuzio and E. Iacopini and E. Imbergamo and B. Jenninger and J. Jerhot and Jones, \{R. W.\} and K. Kampf and V. Kekelidze and S. Kholodenko and G. Khoriauli and A. Khotyantsev and A. Kleimenova and A. Korotkova and M. Koval and V. Kozhuharov and Z. Kucerova and Y. Kudenko and J. Kunze and V. Kurochka and V. Kurshetsov and G. Lanfranchi and G. Lamanna and E. Lari and G. Latino and P. Laycock and C. Lazzeroni and M. Lenti and Miotto, \{G. Lehmann\} and E. Leonardi and P. Lichard and L. Litov and R. Lollini and D. Lomidze and A. Lonardo and P. Lubrano and M. Lupi and N. Lurkin and D. Madigozhin and I. Mannelli and A. Mapelli and F. Marchetto and R. Marchevski and S. Martellotti and P. Massarotti and K. Massri and E. Maurice and M. Medvedeva and A. Mefodev and E. Menichetti and E. Migliore and E. Minucci and M. Mirra and M. Misheva and N. Molokanova and M. Moulson and S. Movchan and M. Napolitano and I. Neri and F. Newson and A. Norton and M. Noy and T. Numao and V. Obraztsov and A. Ostankov and S. Padolski and R. Page and V. Palladino and A. Parenti and C. Parkinson and E. Pedreschi and M. Pepe and M. Perrin-Terrin and L. Peruzzo and P. Petrov and Y. Petrov and F. Petrucci and R. Piandani and M. Piccini and J. Pinzino and I. Polenkevich and L. Pontisso and Yu Potrebenikov and D. Protopopescu and M. Raggi and A. Romano and P. Rubin and G. Ruggiero and V. Ryjov and A. Salamon and C. Santoni and G. Saracino and F. Sargeni and S. Schuchmann and V. Semenov and A. Sergi and A. Shaikhiev and S. Shkarovskiy and D. Soldi and V. Sugonyaev and M. Sozzi and T. Spadaro and F. Spinella and A. Sturgess and S. Trilov and P. Valente and B. Velghe and S. Venditti and P. Vicini and R. Volpe and M. Vormstein and H. Wahl and R. Wanke and B. Wrona and O. Yushchenko and M. Zamkovsky and A. Zinchenko",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).; 40th International Conference on High Energy Physics, ICHEP 2020 ; Conference date: 28-07-2020 Through 06-08-2020",

year = "2021",

month = apr,

day = "15",

language = "English",

volume = "390",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}

Swallow, J, Aliberti, R, Ambrosino, F, Ammendola, R, Angelucci, B, Antonelli, A, Anzivino, G, Arcidiacono, R, Bache, T, Baeva, A, Baigarashev, D, Barbanera, M, Bernhard, J, Biagioni, A, Bician, L, Biino, C, Bizzeti, A, Blazek, T, Bloch-Devaux, B, Bonaiuto, V, Boretto, M, Bragadireanu, M, Britton, D, Brizioli, F, Brunetti, MB, Bryman, D, Bucci, F, Capussela, T, Carmignani, J, Ceccucci, A, Cenci, P, Cerny, V, Cerri, C, Checcucci, B, Conovaloff, A, Cooper, P, Gil, EC, Corvino, M, Costantini, F, Ramusino, AC, Coward, D, D'Agostini, G, Dainton, J, Dalpiaz, P, Danielsson, H, de Simone, N, Di Filippo, D, Di Lella, L, Doble, N, Dobrich, B, Duval, F, Duk, V, Emelyanov, D, Engelfried, J, Enik, T, Estrada-Tristan, N, Falaleev, V, Fantechi, R, Fascianelli, V, Federici, L, Fedotov, S, Filippi, A, Fiorini, M, Fry, J, Fu, J, Fucci, A, Fulton, L, Gamberini, E, Gatignon, L, Georgiev, G, Ghinescu, S, Gianoli, A, Giorgi, M, Giudici, S, Gonnella, F, Goudzovski, E, Graham, C, Guida, R, Gushchin, E, Hahn, F, Heath, H, Henshaw, J, Holzer, EB, Husek, T, Hutanu, O, Hutchcroft, D, Iacobuzio, L, Iacopini, E, Imbergamo, E, Jenninger, B, Jerhot, J, Jones, RW, Kampf, K, Kekelidze, V, Kholodenko, S, Khoriauli, G, Khotyantsev, A, Kleimenova, A, Korotkova, A, Koval, M, Kozhuharov, V, Kucerova, Z, Kudenko, Y, Kunze, J, Kurochka, V, Kurshetsov, V, Lanfranchi, G, Lamanna, G, Lari, E, Latino, G, Laycock, P, Lazzeroni, C, Lenti, M, Miotto, GL, Leonardi, E, Lichard, P, Litov, L, Lollini, R, Lomidze, D, Lonardo, A, Lubrano, P, Lupi, M, Lurkin, N, Madigozhin, D, Mannelli, I, Mapelli, A, Marchetto, F, Marchevski, R, Martellotti, S, Massarotti, P, Massri, K, Maurice, E, Medvedeva, M, Mefodev, A, Menichetti, E, Migliore, E, Minucci, E, Mirra, M, Misheva, M, Molokanova, N, Moulson, M, Movchan, S, Napolitano, M, Neri, I, Newson, F, Norton, A, Noy, M, Numao, T, Obraztsov, V, Ostankov, A, Padolski, S, Page, R, Palladino, V, Parenti, A, Parkinson, C, Pedreschi, E, Pepe, M, Perrin-Terrin, M, Peruzzo, L, Petrov, P, Petrov, Y, Petrucci, F, Piandani, R, Piccini, M, Pinzino, J, Polenkevich, I, Pontisso, L, Potrebenikov, Y, Protopopescu, D, Raggi, M, Romano, A, Rubin, P, Ruggiero, G, Ryjov, V, Salamon, A, Santoni, C, Saracino, G, Sargeni, F, Schuchmann, S, Semenov, V, Sergi, A, Shaikhiev, A, Shkarovskiy, S, Soldi, D, Sugonyaev, V, Sozzi, M, Spadaro, T, Spinella, F, Sturgess, A, Trilov, S, Valente, P, Velghe, B, Venditti, S, Vicini, P, Volpe, R, Vormstein, M, Wahl, H, Wanke, R, Wrona, B, Yushchenko, O, Zamkovsky, M & Zinchenko, A 2021, 'Searches for lepton flavour and lepton number violation in K⁺ decays at NA62', Proceedings of Science, vol. 390, 430.

TY - JOUR

T1 - Searches for lepton flavour and lepton number violation in K+ decays at NA62

AU - Swallow, Joel

AU - Aliberti, R.

AU - Ambrosino, F.

AU - Ammendola, R.

AU - Angelucci, B.

AU - Antonelli, A.

AU - Anzivino, G.

AU - Arcidiacono, R.

AU - Bache, T.

AU - Baeva, A.

AU - Baigarashev, D.

AU - Barbanera, M.

AU - Bernhard, J.

AU - Biagioni, A.

AU - Bician, L.

AU - Biino, C.

AU - Bizzeti, A.

AU - Blazek, T.

AU - Bloch-Devaux, B.

AU - Bonaiuto, V.

AU - Boretto, M.

AU - Bragadireanu, M.

AU - Britton, D.

AU - Brizioli, F.

AU - Brunetti, M. B.

AU - Bryman, D.

AU - Bucci, F.

AU - Capussela, T.

AU - Carmignani, J.

AU - Ceccucci, A.

AU - Cenci, P.

AU - Cerny, V.

AU - Cerri, C.

AU - Checcucci, B.

AU - Conovaloff, A.

AU - Cooper, P.

AU - Gil, E. Cortina

AU - Corvino, M.

AU - Costantini, F.

AU - Ramusino, A. Cotta

AU - Coward, D.

AU - D'Agostini, G.

AU - Dainton, J.

AU - Dalpiaz, P.

AU - Danielsson, H.

AU - de Simone, N.

AU - Di Filippo, D.

AU - Di Lella, L.

AU - Doble, N.

AU - Dobrich, B.

AU - Duval, F.

AU - Duk, V.

AU - Emelyanov, D.

AU - Engelfried, J.

AU - Enik, T.

AU - Estrada-Tristan, N.

AU - Falaleev, V.

AU - Fantechi, R.

AU - Fascianelli, V.

AU - Federici, L.

AU - Fedotov, S.

AU - Filippi, A.

AU - Fiorini, M.

AU - Fry, J.

AU - Fu, J.

AU - Fucci, A.

AU - Fulton, L.

AU - Gamberini, E.

AU - Gatignon, L.

AU - Georgiev, G.

AU - Ghinescu, S.

AU - Gianoli, A.

AU - Giorgi, M.

AU - Giudici, S.

AU - Gonnella, F.

AU - Goudzovski, E.

AU - Graham, C.

AU - Guida, R.

AU - Gushchin, E.

AU - Hahn, F.

AU - Heath, H.

AU - Henshaw, J.

AU - Holzer, E. B.

AU - Husek, T.

AU - Hutanu, O.

AU - Hutchcroft, D.

AU - Iacobuzio, L.

AU - Iacopini, E.

AU - Imbergamo, E.

AU - Jenninger, B.

AU - Jerhot, J.

AU - Jones, R. W.

AU - Kampf, K.

AU - Kekelidze, V.

AU - Kholodenko, S.

AU - Khoriauli, G.

AU - Khotyantsev, A.

AU - Kleimenova, A.

AU - Korotkova, A.

AU - Koval, M.

AU - Kozhuharov, V.

AU - Kucerova, Z.

AU - Kudenko, Y.

AU - Kunze, J.

AU - Kurochka, V.

AU - Kurshetsov, V.

AU - Lanfranchi, G.

AU - Lamanna, G.

AU - Lari, E.

AU - Latino, G.

AU - Laycock, P.

AU - Lazzeroni, C.

AU - Lenti, M.

AU - Miotto, G. Lehmann

AU - Leonardi, E.

AU - Lichard, P.

AU - Litov, L.

AU - Lollini, R.

AU - Lomidze, D.

AU - Lonardo, A.

AU - Lubrano, P.

AU - Lupi, M.

AU - Lurkin, N.

AU - Madigozhin, D.

AU - Mannelli, I.

AU - Mapelli, A.

AU - Marchetto, F.

AU - Marchevski, R.

AU - Martellotti, S.

AU - Massarotti, P.

AU - Massri, K.

AU - Maurice, E.

AU - Medvedeva, M.

AU - Mefodev, A.

AU - Menichetti, E.

AU - Migliore, E.

AU - Minucci, E.

AU - Mirra, M.

AU - Misheva, M.

AU - Molokanova, N.

AU - Moulson, M.

AU - Movchan, S.

AU - Napolitano, M.

AU - Neri, I.

AU - Newson, F.

AU - Norton, A.

AU - Noy, M.

AU - Numao, T.

AU - Obraztsov, V.

AU - Ostankov, A.

AU - Padolski, S.

AU - Page, R.

AU - Palladino, V.

AU - Parenti, A.

AU - Parkinson, C.

AU - Pedreschi, E.

AU - Pepe, M.

AU - Perrin-Terrin, M.

AU - Peruzzo, L.

AU - Petrov, P.

AU - Petrov, Y.

AU - Petrucci, F.

AU - Piandani, R.

AU - Piccini, M.

AU - Pinzino, J.

AU - Polenkevich, I.

AU - Pontisso, L.

AU - Potrebenikov, Yu

AU - Protopopescu, D.

AU - Raggi, M.

AU - Romano, A.

AU - Rubin, P.

AU - Ruggiero, G.

AU - Ryjov, V.

AU - Salamon, A.

AU - Santoni, C.

AU - Saracino, G.

AU - Sargeni, F.

AU - Schuchmann, S.

AU - Semenov, V.

AU - Sergi, A.

AU - Shaikhiev, A.

AU - Shkarovskiy, S.

AU - Soldi, D.

AU - Sugonyaev, V.

AU - Sozzi, M.

AU - Spadaro, T.

AU - Spinella, F.

AU - Sturgess, A.

AU - Trilov, S.

AU - Valente, P.

AU - Velghe, B.

AU - Venditti, S.

AU - Vicini, P.

AU - Volpe, R.

AU - Vormstein, M.

AU - Wahl, H.

AU - Wanke, R.

AU - Wrona, B.

AU - Yushchenko, O.

AU - Zamkovsky, M.

AU - Zinchenko, A.

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).

PY - 2021/4/15

Y1 - 2021/4/15

N2 - A search for the lepton number violating K+ ? p-µ+e+ and lepton flavour violating K+ ? p-µ-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90% confidence level: B(K+ ? p-µ+e+) < 4.2 × 10-11 and B(K+ ? p+µ-e+) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively.

AB - A search for the lepton number violating K+ ? p-µ+e+ and lepton flavour violating K+ ? p-µ-e+ decays is reported using NA62 data collected in 2017 and 2018. No significant excess is observed above the background expectation and therefore upper limits are established on the branching ratios at 90% confidence level: B(K+ ? p-µ+e+) < 4.2 × 10-11 and B(K+ ? p+µ-e+) < 6.6 × 10-11. These results improve over the previous limits by factors of 12 and 8 respectively.

M3 - Conference article

AN - SCOPUS:85105476444

SN - 1824-8039

VL - 390

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 430

T2 - 40th International Conference on High Energy Physics, ICHEP 2020

Y2 - 28 July 2020 through 6 August 2020

ER -

Searches for lepton flavour and lepton number violation in K+ decays at NA62

Abstract

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Searches for lepton flavour and lepton number violation in K⁺ decays at NA62