Search for K+ decays into the π+e+e−e+e− final state

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

doi:10.1016/j.physletb.2023.138193

Search for K+ decays into the π+e+e−e+e− final state

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

Dipartimento di Scienze del Farmaco

Risultato della ricerca: Contributo su rivista › Articolo in rivista › peer review

Abstract

The first search for ultra-rare K+ decays into the π+e+e−e+e− final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8 at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e− decay, predicted in the Standard Model to be (7.2±0.7)×10−11. Upper limits at 90% CL are obtained at the level of 10−9 for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a→e+e− and K+→π+S, S→A′A′, A′→e+e−.

Lingua originale	Inglese
Rivista	PHYSICS LETTERS. SECTION B
Volume	846
DOI	https://doi.org/10.1016/j.physletb.2023.138193
Stato di pubblicazione	Pubblicato - 2023

Accesso al documento

10.1016/j.physletb.2023.138193

https://hdl.handle.net/11579/186646

Altri file e collegamenti

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Cita questo

Cortina, G. E., Kleimenova, A., Minucci, E., Padolski, S., Petrov, P., Shaikhiev, A., Volpe, R., Numao, T., Petrov, Y., Velghe, B., Wong, V. W. S., Bryman, D., Fu, J., Hives, Z., Husek, T., Jerhot, J., Kampf, K., Zamkovsky, M., De, M. B., ... Zinchenko, A. (2023). Search for K+ decays into the π+e+e−e+e− final state. PHYSICS LETTERS. SECTION B, 846. https://doi.org/10.1016/j.physletb.2023.138193

@article{1ad62571088543e9a6a8e6fe296429ca,

title = "Search for K+ decays into the π+e+e−e+e− final state",

abstract = "The first search for ultra-rare K+ decays into the π+e+e−e+e− final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8 at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e− decay, predicted in the Standard Model to be (7.2±0.7)×10−11. Upper limits at 90% CL are obtained at the level of 10−9 for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a→e+e− and K+→π+S, S→A′A′, A′→e+e−.",

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

year = "2023",

doi = "10.1016/j.physletb.2023.138193",

language = "English",

volume = "846",

journal = "PHYSICS LETTERS. SECTION B",

issn = "0370-2693",

}

Cortina, GE, Kleimenova, A, Minucci, E, Padolski, S, Petrov, P, Shaikhiev, A, Volpe, R, Numao, T, Petrov, Y, Velghe, B, Wong, VWS, Bryman, D, Fu, J, Hives, Z, Husek, T, Jerhot, J, Kampf, K, Zamkovsky, M, De, MB, Perrin-Terrin, M, Akmete, AT, Aliberti, R, Khoriauli, G, Kunze, J, Lomidze, D, Peruzzo, L, Vormstein, M, Wanke, R, Dalpiaz, P, Fiorini, M, Mazzolari, A, Neri, I, Norton, A, Petrucci, F, Soldani, M, Wahl, H, Bandiera, L, Cotta, RA, Gianoli, A, Romagnoni, M, Sytov, A, Iacopini, E, Latino, G, Lenti, M, Lo, CP, Panichi, I, Parenti, A, Bizzeti, A, Bucci, F, Antonelli, A, Georgiev, G, Kozhuharov, V, Lanfranchi, G, Martellotti, S, Moulson, M, Spadaro, T, Tinti, G, Ambrosino, F, Capussela, T, Corvino, M, D'Errico, M, Di, FD, Fiorenza, R, Giordano, R, Massarotti, P, Mirra, M, Napolitano, M, Rosa, I, Saracino, G, Anzivino, G, Brizioli, F, Imbergamo, E, Lollini, R, Piandani, R, Santoni, C, Barbanera, M, Cenci, P, Checcucci, B, Lubrano, P, Lupi, M, Pepe, M, Piccini, M, Costantini, F, Di, LL, Doble, N, Giorgi, M, Giudici, S, Lamanna, G, Lari, E, Pedreschi, E, Sozzi, M, Cerri, C, Fantechi, R, Pontisso, L, Spinella, F, Mannelli, I, D'Agostini, G, Raggi, M, Biagioni, A, Cretaro, P, Frezza, O, Leonardi, E, Lonardo, A, Turisini, M, Valente, P, Vicini, P, Ammendola, R, Bonaiuto, V, Fucci, A, Salamon, A, Sargeni, F, ARCIDIACONO, R, Bloch-Devaux, B, Boretto, M, Menichetti, E, Migliore, E, Soldi, D, Biino, C, Filippi, A, Marchetto, F, Briano, OA, Engelfried, J, Estrada-Tristan, N, Reyes, SMA, Boboc, P, Bragadireanu, AM, Ghinescu, SA, Hutanu, OE, Bician, L, Blazek, T, Cerny, V, Kucerova, Z, Bernhard, J, Ceccucci, A, Ceoletta, M, Danielsson, H, De, SN, Duval, F, Dobrich, B, Federici, L, Gamberini, E, Gatignon, L, Guida, R, Hahn, F, Holzer, EB, Jenninger, B, Koval, M, Laycock, P, Lehmann, MG, Lichard, P, Mapelli, A, Marchevski, R, Massri, K, Noy, M, Palladino, V, Pinzino, J, Ryjov, V, Schuchmann, S, Venditti, S, Bache, T, Brunetti, MB, Duk, V, Fascianelli, V, Fry, JR, Gonnella, F, Goudzovski, E, Henshaw, J, Iacobuzio, L, Kenworthy, C, Lazzeroni, C, Lurkin, N, Newson, F, Parkinson, C, Romano, A, Sanders, J, Sergi, A, Sturgess, A, Swallow, J, Tomczak, A, Heath, H, Page, R, Trilov, S, Angelucci, B, Britton, D, Graham, C, Protopopescu, D, Carmignani, J, Dainton, JB, Jones, RWL, Ruggiero, G, Fulton, L, Hutchcroft, D, Maurice, E, Wrona, B, Conovaloff, A, Cooper, P, Coward, D, Rubin, P, Baeva, A, Baigarashev, D, Emelyanov, D, Enik, T, Falaleev, V, Fedotov, S, Gorshanov, K, Gushchin, E, Kekelidze, V, Kereibay, D, Kholodenko, S, Khotyantsev, A, Korotkova, A, Kudenko, Y, Kurochka, V, Kurshetsov, V, Litov, L, Madigozhin, D, Medvedeva, M, Mefodev, A, Misheva, M, Molokanova, N, Movchan, S, Obraztsov, V, Okhotnikov, A, Ostankov, A, Polenkevich, I, Potrebenikov, Y, Sadovskiy, A, Semenov, V, Shkarovskiy, S, Sugonyaev, V, Yushchenko, O & Zinchenko, A 2023, 'Search for K+ decays into the π+e+e−e+e− final state', PHYSICS LETTERS. SECTION B, vol. 846. https://doi.org/10.1016/j.physletb.2023.138193

TY - JOUR

T1 - Search for K+ decays into the π+e+e−e+e− final state

AU - Cortina, Gil E.

AU - Kleimenova, A.

AU - Minucci, E.

AU - Padolski, S.

AU - Petrov, P.

AU - Shaikhiev, A.

AU - Volpe, R.

AU - Numao, T.

AU - Petrov, Y.

AU - Velghe, B.

AU - Wong, V. W. S.

AU - Bryman, D.

AU - Fu, J.

AU - Hives, Z.

AU - Husek, T.

AU - Jerhot, J.

AU - Kampf, K.

AU - Zamkovsky, M.

AU - De, Martino B.

AU - Perrin-Terrin, M.

AU - Akmete, A. T.

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 - Mazzolari, A.

AU - Neri, I.

AU - Norton, A.

AU - Petrucci, F.

AU - Soldani, M.

AU - Wahl, H.

AU - Bandiera, L.

AU - Cotta, Ramusino A.

AU - Gianoli, A.

AU - Romagnoni, M.

AU - Sytov, A.

AU - Iacopini, E.

AU - Latino, G.

AU - Lenti, M.

AU - Lo, Chiatto P.

AU - Panichi, I.

AU - Parenti, A.

AU - Bizzeti, A.

AU - Bucci, F.

AU - Antonelli, A.

AU - Georgiev, G.

AU - Kozhuharov, V.

AU - Lanfranchi, G.

AU - Martellotti, S.

AU - Moulson, M.

AU - Spadaro, T.

AU - Tinti, G.

AU - Ambrosino, F.

AU - Capussela, T.

AU - Corvino, M.

AU - D'Errico, M.

AU - Di, Filippo D.

AU - Fiorenza, R.

AU - Giordano, R.

AU - Massarotti, P.

AU - Mirra, M.

AU - Napolitano, M.

AU - Rosa, I.

AU - Saracino, G.

AU - Anzivino, G.

AU - Brizioli, F.

AU - Imbergamo, E.

AU - Lollini, R.

AU - Piandani, R.

AU - Santoni, C.

AU - Barbanera, M.

AU - Cenci, P.

AU - Checcucci, B.

AU - Lubrano, P.

AU - Lupi, M.

AU - Pepe, M.

AU - Piccini, M.

AU - Costantini, F.

AU - Di, Lella L.

AU - Doble, N.

AU - Giorgi, M.

AU - Giudici, S.

AU - Lamanna, G.

AU - Lari, E.

AU - Pedreschi, E.

AU - Sozzi, M.

AU - Cerri, C.

AU - Fantechi, R.

AU - Pontisso, L.

AU - Spinella, F.

AU - Mannelli, I.

AU - D'Agostini, G.

AU - Raggi, M.

AU - Biagioni, A.

AU - Cretaro, P.

AU - Frezza, O.

AU - Leonardi, E.

AU - Lonardo, A.

AU - Turisini, M.

AU - Valente, P.

AU - Vicini, P.

AU - Ammendola, R.

AU - Bonaiuto, V.

AU - Fucci, A.

AU - Salamon, A.

AU - Sargeni, F.

AU - ARCIDIACONO, Roberta

AU - Bloch-Devaux, B.

AU - Boretto, M.

AU - Menichetti, E.

AU - Migliore, E.

AU - Soldi, D.

AU - Biino, C.

AU - Filippi, A.

AU - Marchetto, F.

AU - Briano, Olvera A.

AU - Engelfried, J.

AU - Estrada-Tristan, N.

AU - Reyes, Santos M. A.

AU - Boboc, P.

AU - Bragadireanu, A. M.

AU - Ghinescu, S. A.

AU - Hutanu, O. E.

AU - Bician, L.

AU - Blazek, T.

AU - Cerny, V.

AU - Kucerova, Z.

AU - Bernhard, J.

AU - Ceccucci, A.

AU - Ceoletta, M.

AU - Danielsson, H.

AU - De, Simone N.

AU - Duval, F.

AU - Dobrich, B.

AU - Federici, L.

AU - Gamberini, E.

AU - Gatignon, L.

AU - Guida, R.

AU - Hahn, F.

AU - Holzer, E. B.

AU - Jenninger, B.

AU - Koval, M.

AU - Laycock, P.

AU - Lehmann, Miotto G.

AU - Lichard, P.

AU - Mapelli, A.

AU - Marchevski, R.

AU - Massri, K.

AU - Noy, M.

AU - Palladino, V.

AU - Pinzino, J.

AU - Ryjov, V.

AU - Schuchmann, S.

AU - Venditti, S.

AU - Bache, T.

AU - Brunetti, M. B.

AU - Duk, V.

AU - Fascianelli, V.

AU - Fry, J. R.

AU - Gonnella, F.

AU - Goudzovski, E.

AU - Henshaw, J.

AU - Iacobuzio, L.

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AU - Yushchenko, O.

AU - Zinchenko, A.

PY - 2023

Y1 - 2023

N2 - The first search for ultra-rare K+ decays into the π+e+e−e+e− final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8 at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e− decay, predicted in the Standard Model to be (7.2±0.7)×10−11. Upper limits at 90% CL are obtained at the level of 10−9 for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a→e+e− and K+→π+S, S→A′A′, A′→e+e−.

AB - The first search for ultra-rare K+ decays into the π+e+e−e+e− final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017–2018. An upper limit of 1.4×10−8 at 90% CL is obtained for the branching ratio of the K+→π+e+e−e+e− decay, predicted in the Standard Model to be (7.2±0.7)×10−11. Upper limits at 90% CL are obtained at the level of 10−9 for the branching ratios of two prompt decay chains involving pair-production of hidden-sector mediators: K+→π+aa, a→e+e− and K+→π+S, S→A′A′, A′→e+e−.

UR - https://iris.uniupo.it/handle/11579/186646

U2 - 10.1016/j.physletb.2023.138193

DO - 10.1016/j.physletb.2023.138193

M3 - Article

SN - 0370-2693

VL - 846

JO - PHYSICS LETTERS. SECTION B

JF - PHYSICS LETTERS. SECTION B

ER -

Search for K+ decays into the π+e+e−e+e− final state

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