| Title: |
Search for $K^+$ decays into the $\pi^+e^+e^-e^+e^-$ final state |
| Authors: |
Cortina Gil, Eduardo; Minucci, Elisa; Husek, Tomas; Fucci, Adolfo; Salamon, Andrea; Sargeni, Fausto; Arcidiacono, Roberta; Biino, Cristina; Bloch-Devaux, Brigitte; Boretto, Marco; Filippi, Alessandra; Iacobuzio, Lorenza; Marchetto, Flavio; Kampf, Karol; Menichetti, Ezio; Migliore, Ernesto; Soldi, Dario; Engelfried, Jürgen; Estrada-Tristan, Nora; Bragadireanu, Alexandru Mario; Ghinescu, Stefan Alexandru; Hutanu, Ovidiu Emanuel; Enik, Temur; Falaleev, Valeri; Zamkovsky, Michal; Kekelidze, Vladimir; Korotkova, Anna; Madigozhin, Dmitry; Misheva, Milena; Molokanova, Natalia; Movchan, Sergei; Polenkevich, Irina; Potrebenikov, Yuri; Shkarovskiy, Sergey; Zinchenko, Andrey; Jerhot, Jan; Baeva, Aigul; Baigarashev, Dosbol; Emelyanov, Dmitry; Fedotov, Sergei; Khotyantsev, Alexey; Gushchin, Evgeny; Kleimenova, Alina; Kudenko, Yury; Kurochka, Viktoriia; Medvedeva, Mariia; Aliberti, Riccardo; Mefodev, Aleksandr; Shaikhiev, Artur; Kholodenko, Sergey; Kurshetsov, Viktor; Obraztsov, Vladimir; Ostankov, Aleksandr; Semenov, Vitali; Sugonyaev, Valentin; Yushchenko, Oleg; Bician, Lubos; Khoriauli, Gia; Blazek, Tomas; Cerny, Vladimir; Koval, Michal; Kucerova, Zuzana; Ceccucci, Augusto; Bernhard, Johannes; Danielsson, Hans; Döbrich, Babette; Duval, Francois; Gatignon, Lau; Kunze, Jonas; Guida, Roberto; Hahn, Ferdinand; Holzer, Eva Barbara; Jenninger, Berthold; Laycock, Paul; Lehmann Miotto, Giovanna; Lichard, Peter; Mapelli, Alessandro; Noy, Matthew; Palladino, Vito; Lomidze, David; Perrin-Terrin, Mathieu; Ruggiero, Giuseppe; Ryjov, Vladimir; Schuchmann, Simone; Venditti, Stefano; Brunetti, Maria Brigida; Bache, Thomas; Goudzovski, Evgueni; Henshaw, Jack; Tomczak, Adam; Marchevski, Radoslav; Lazzeroni, Cristina; Fascianelli, Valeria; Lurkin, Nicolas; Newson, Francis; Parkinson, Christopher; Romano, Angela; Sergi, Antonino; Sturgess, Andrew; Swallow, Joel; Heath, Helen; Peruzzo, Letizia; Page, Ryan; Trilov, Stoyan; Angelucci, Bruno; Britton, David; Protopopescu, Dan; Graham, Connor; Jones, Roger William Lewis; Dainton, John Bourke; Fry, John Richard; Fulton, Liam; Padolski, Sergey; Vormstein, Mario; Hutchcroft, David; Carmignani, Joseph; Massri, Karim; Maurice, Emilie; Wrona, Bozydar; Conovaloff, Adam; Cooper, Peter; Coward, David; Rubin, Philip David; Hives, Zdenko; Wanke, Rainer; Akmete, Atakan Tugberk; Soldani, Mattia; Bandiera, Laura; Mazzolari, Andrea; Romagnoni, Marco; Sytov, Alexei; Panichi, Ilaria; Lo Chiatto, Prisco; D'Errico, Mariaelena; Giordano, Raffaele; Cotta Ramusino, Angelo; Briano Olvera, Alejandro; Reyes Santos, Marco Antonio; Boboc, Petre; Kereibay, Dias; Gorshanov, Konstantin; Okhotnikov, Artem; Sadovskiy, Alexander; Sanders, Jack; Kenworthy, Chandler; De Martino, Bianca; Dalpiaz, Pietro; Rosa, Ilaria; Ceoletta, Marco; NA62 Collaboration; Fiorini, Massimiliano; Gamberini, Enrico; Gianoli, Alberto; Neri, Ilaria; Norton, Alan; Petrucci, Ferruccio; Petrov, Plamen; Wahl, Heinrich; Bizzeti, Andrea; Bucci, Francesca; Iacopini, Enrico; Latino, Giuseppe; Lenti, Massimo; Parenti, Andrea; Volpe, Roberta; Antonelli, Antonella; Gonnella, Francesco; Velghe, Bob; Lamanna, Gianluca; Lanfranchi, Gaia; Tinti, Gemma; Martellotti, Silvia; Moulson, Matthew; Kozhuharov, Venelin; Litov, Leandar; Georgiev, Georgi; Raggi, Mauro; Spadaro, Tommaso; Bryman, Douglas; Ambrosino, Fabio; Fiorenza, Renato; Capussela, Tiziana; Corvino, Michele; Di Filippo, Domenico; Massarotti, Paolo; Mirra, Marco; Napolitano, Marco; Saracino, Giulio; Anzivino, Giuseppina; Fu, Ji; Imbergamo, Ermanno; Lollini, Riccardo; Santoni, Cristiano; Brizioli, Francesco; Barbanera, Mattia; Cenci, Patrizia; Checcucci, Bruno; Duk, Viacheslav; Lupi, Matteo; Pepe, Monica; Numao, Toshio; Piccini, Mauro; Lubrano, Pasquale; Costantini, Flavio; Doble, Niels; Giorgi, Marcello; Giudici, Sergio; Lari, Enrico; Pinzino, Jacopo; Pontisso, Luca; Sozzi, Marco; Petrov, Yevgeniy; Di Lella, Luigi; Mannelli, Italo; Cerri, Claudio; Fantechi, Riccardo; Pedreschi, Elena; Piandani, Roberto; Spinella, Franco; Biagioni, Andrea; D'Agostini, Giulio; Leonardi, Emanuele; Wong, Vincent Wai Sum; Lonardo, Alessandro; Valente, Paolo; Vicini, Piero; Cretaro, Paolo; Turisini, Matteo; Frezza, Ottorino; Ammendola, Roberto; Bonaiuto, Vincenzo; De Simone, Nicola; Federici, Luca |
| Source: |
doi:10.3204/PUBDB-2023-04828 |
| Publication Year: |
2023 |
| Collection: |
DESY Publication Database (PUBDB) |
| Subject Terms: |
info:eu-repo/classification/ddc/530; K+: secondary beam; K+: semileptonic decay; K+: rare decay; quantum chromodynamics: axion; K+: branching ratio; branching ratio: upper limit; new particle; neutral particle: pair production; CERN Lab; mediation; NA62; CERN SPS; anomaly; photon: hidden sector; experimental results; K+ --> pi+ 2electron 2positron |
| Subject Geographic: |
DE |
| Description: |
The first search for ultra-rare $K^+$ decays into the $\pi^+e^+e^-e^+e^-$ final state is reported, using a dataset collected by the NA62 experiment at CERN in 2017-2018. An upper limit of $1.4\times 10^{-8}$ at 90% CL is obtained for the branching ratio of the $K^+\to\pi^+e^+e^-e^+e^-$ decay, predicted in the Standard Model to be $(7.2\pm0.7)\times 10^{-11}$. 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: $K^+\to\pi^+aa$, $a\to e^+e^-$ and $K^+\to\pi^+S$, $S\to A^\prime A^\prime$, $A^\prime\to e^+e^-$. The QCD axion is excluded as a possible explanation of the '17 MeV anomaly'. |
| Document Type: |
report |
| Language: |
English |
| Relation: |
info:eu-repo/semantics/altIdentifier/arxiv/arXiv:2307.04579 |
| Availability: |
https://bib-pubdb1.desy.de/record/588601; https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2023-04828%22 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.E77B8D46 |
| Database: |
BASE |