| Title: |
Search for $\pi^0$ decays to invisible particles |
| Authors: |
Cortina Gil, Eduardo; Minucci, Elisa; Zamkovsky, Michal; Filippi, Alessandra; Iacobuzio, Lorenza; Marchetto, Flavio; Menichetti, Ezio; Migliore, Ernesto; Soldi, Dario; Engelfried, Jürgen; Estrada-Tristan, Nora; Bragadireanu, Alexandru Mario; Ghinescu, Stefan Alexandru; Jerhot, Jan; Hutanu, Ovidiu Emanuel; Enik, Temur; Falaleev, Valeri; Kekelidze, Vladimir; Korotkova, Anna; Madigozhin, Dmitry; Misheva, Milena; Molokanova, Natalia; Movchan, Sergei; Polenkevich, Irina; Aliberti, Riccardo; Potrebenikov, Yuri; Shkarovskiy, Sergey; Zinchenko, Alexander; Baeva, Aigul; Baigarashev, Dosbol; Emelyanov, Dmitry; Fedotov, Sergei; Khotyantsev, Alexey; Gushchin, Evgeny; Kleimenova, Alina; Khoriauli, Gia; Kudenko, Yury; Kurochka, Viktoriia; Medvedeva, Mariia; Mefodev, Aleksandr; Shaikhiev, Artur; Kholodenko, Sergey; Kurshetsov, Viktor; Obraztsov, Vladimir; Ostankov, Aleksandr; Semenov, Vitali; Kunze, Jonas; Sugonyaev, Valentin; Yushchenko, Oleg; Bician, Lubos; Blazek, Tomas; Cerny, Vladimir; Koval, Michal; Kucerova, Zuzana; Ceccucci, Augusto; Bernhard, Johannes; Danielsson, Hans; Lomidze, David; Döbrich, Babette; Duval, Francois; Gatignon, Lau; Guida, Roberto; Hahn, Ferdinand; Holzer, Eva Barbara; Jenninger, Berthold; Laycock, Paul; Lehmann Miotto, Giovanna; Lichard, Peter; Marchevski, Radoslav; Mapelli, Alessandro; Noy, Matthew; Palladino, Vito; Perrin-Terrin, Mathieu; Ruggiero, Giuseppe; Ryjov, Vladimir; Schuchmann, Simone; Venditti, Stefano; Brunetti, Maria Brigida; Bache, Thomas; Peruzzo, Letizia; Goudzovski, Evgueni; Lazzeroni, Cristina; Fascianelli, Valeria; Lurkin, Nicolas; Newson, Francis; Parkinson, Christopher; Romano, Angela; Sergi, Antonino; Sturgess, Andrew; Swallow, Joel; Vormstein, Mario; Heath, Helen; Page, Ryan; Trilov, Stoyan; Angelucci, Bruno; Britton, David; Protopopescu, Dan; Graham, Connor; Jones, Roger William Lewis; Dainton, John Bourke; Fry, John Richard; Wanke, Rainer; Fulton, Liam; Hutchcroft, David; Carmignani, Joseph; Massri, Karim; Maurice, Emilie; Wrona, Bozydar; Conovaloff, Adam; Cooper, Peter; Coward, David; Rubin, Philip David; Padolski, Sergey; Cotta Ramusino, Angelo; NA62 Collaboration; Dalpiaz, Pietro; Fiorini, Massimiliano; Gamberini, Enrico; Gianoli, Alberto; Neri, Ilaria; Norton, Alan; Petrucci, Ferruccio; Wahl, Heinrich; Bizzeti, Andrea; Petrov, Plamen; Bucci, Francesca; Iacopini, Enrico; Latino, Giuseppe; Lenti, Massimo; Parenti, Andrea; Volpe, Roberta; Antonelli, Antonella; Gonnella, Francesco; Lamanna, Gianluca; Lanfranchi, Gaia; Velghe, Bob; Martellotti, Silvia; Moulson, Matthew; Kozhuharov, Venelin; Litov, Leandar; Georgiev, Georgi; Raggi, Mauro; Spadaro, Tommaso; Ambrosino, Fabio; Capussela, Tiziana; Corvino, Michele; Bryman, Douglas; Di Filippo, Domenico; Massarotti, Paolo; Mirra, Marco; Napolitano, Marco; Saracino, Giulio; Anzivino, Giuseppina; Imbergamo, Ermanno; Lollini, Riccardo; Santoni, Cristiano; Brizioli, Francesco; Fu, Ji; Barbanera, Mattia; Cenci, Patrizia; Checcucci, Bruno; Duk, Viacheslav; Lupi, Matteo; Pepe, Monica; Piccini, Mauro; Lubrano, Pasquale; Costantini, Flavio; Doble, Niels; Numao, Toshio; Giorgi, Marcello; Giudici, Sergio; Lari, Enrico; Pinzino, Jacopo; Pontisso, Luca; Sozzi, Marco; Di Lella, Luigi; Mannelli, Italo; Cerri, Claudio; Fantechi, Riccardo; Husek, Tomas; Pedreschi, Elena; Piandani, Roberto; Spinella, Franco; Biagioni, Andrea; D'Agostini, Giulio; Leonardi, Emanuele; Lonardo, Alessandro; Valente, Paolo; Vicini, Piero; Ammendola, Roberto; Kampf, Karol; Bonaiuto, Vincenzo; De Simone, Nicola; Federici, Luca; Fucci, Adolfo; Salamon, Andrea; Sargeni, Fausto; Arcidiacono, Roberta; Biino, Cristina; Bloch-Devaux, Brigitte; Boretto, Marco |
| Source: |
Journal of high energy physics 02(2), 201 (2021). doi:10.1007/JHEP02(2021)201 |
| Publisher Information: |
SISSA |
| Publication Year: |
2021 |
| Collection: |
DESY Publication Database (PUBDB) |
| Subject Terms: |
info:eu-repo/classification/ddc/530; pi0: invisible decay; background: fluctuation; fermion: coupling; pi0: branching ratio: upper limit; K: branching ratio; axion-like particles; hidden sector; CERN SPS; lifetime; mixing; NA62; experimental results |
| Subject Geographic: |
DE |
| Description: |
The NA62 experiment at the CERN SPS reports a study of a sample of $4 \times10^{9}$ tagged $\pi^0$ mesons from $K^+ \to \pi^+ \pi^0 (\gamma)$, searching for the decay of the $\pi^0$ to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of $4.4 \times10^{-9}$ is set on the branching ratio at 90% confidence level, improving on previous results by a factor of 60. This result can also be interpreted as a model-independent upper limit on the branching ratio for the decay $K^+ \to \pi^+ X$, where $X$ is a particle escaping detection with mass in the range 0.110-0.155 GeV$/c^2$ and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming $X$ to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| ISSN: |
1029-8479; 1126-6708; 1127-2236 |
| Relation: |
info:eu-repo/semantics/altIdentifier/issn/1029-8479; info:eu-repo/semantics/altIdentifier/arxiv/arXiv:2010.07644; info:eu-repo/semantics/altIdentifier/wos/WOS:000681463700001; info:eu-repo/semantics/altIdentifier/issn/1126-6708; info:eu-repo/semantics/altIdentifier/issn/1127-2236 |
| Availability: |
https://bib-pubdb1.desy.de/record/474205; https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2022-00595%22 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.E4C51A4F |
| Database: |
BASE |