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@ARTICLE{CortinaGil:474205,
      author       = {Cortina Gil, Eduardo and Minucci, Elisa and Padolski,
                      Sergey and Petrov, Plamen and Velghe, Bob and Bryman,
                      Douglas and Fu, Ji and Numao, Toshio and Husek, Tomas and
                      Kampf, Karol and Zamkovsky, Michal and Jerhot, Jan and
                      Aliberti, Riccardo and Khoriauli, Gia and Kunze, Jonas and
                      Lomidze, David and Marchevski, Radoslav and Peruzzo, Letizia
                      and Vormstein, Mario and Wanke, Rainer and Cotta Ramusino,
                      Angelo and Dalpiaz, Pietro and Fiorini, Massimiliano and
                      Gamberini, Enrico and Gianoli, Alberto and Neri, Ilaria and
                      Norton, Alan and Petrucci, Ferruccio and Wahl, Heinrich and
                      Bizzeti, Andrea and Bucci, Francesca and Iacopini, Enrico
                      and Latino, Giuseppe and Lenti, Massimo and Parenti, Andrea
                      and Volpe, Roberta and Antonelli, Antonella and Gonnella,
                      Francesco and Lamanna, Gianluca and Lanfranchi, Gaia and
                      Martellotti, Silvia and Moulson, Matthew and Kozhuharov,
                      Venelin and Litov, Leandar and Georgiev, Georgi and Raggi,
                      Mauro and Spadaro, Tommaso and Ambrosino, Fabio and
                      Capussela, Tiziana and Corvino, Michele and Di Filippo,
                      Domenico and Massarotti, Paolo and Mirra, Marco and
                      Napolitano, Marco and Saracino, Giulio and Anzivino,
                      Giuseppina and Imbergamo, Ermanno and Lollini, Riccardo and
                      Santoni, Cristiano and Brizioli, Francesco and Barbanera,
                      Mattia and Cenci, Patrizia and Checcucci, Bruno and Duk,
                      Viacheslav and Lupi, Matteo and Pepe, Monica and Piccini,
                      Mauro and Lubrano, Pasquale and Costantini, Flavio and
                      Doble, Niels and Giorgi, Marcello and Giudici, Sergio and
                      Lari, Enrico and Pinzino, Jacopo and Pontisso, Luca and
                      Sozzi, Marco and Di Lella, Luigi and Mannelli, Italo and
                      Cerri, Claudio and Fantechi, Riccardo and Pedreschi, Elena
                      and Piandani, Roberto and Spinella, Franco and Biagioni,
                      Andrea and D'Agostini, Giulio and Leonardi, Emanuele and
                      Lonardo, Alessandro and Valente, Paolo and Vicini, Piero and
                      Ammendola, Roberto and Bonaiuto, Vincenzo and De Simone,
                      Nicola and Federici, Luca and Fucci, Adolfo and Salamon,
                      Andrea and Sargeni, Fausto and Arcidiacono, Roberta and
                      Biino, Cristina and Bloch-Devaux, Brigitte and Boretto,
                      Marco and Filippi, Alessandra and Iacobuzio, Lorenza and
                      Marchetto, Flavio and Menichetti, Ezio and Migliore, Ernesto
                      and Soldi, Dario and Engelfried, Jürgen and
                      Estrada-Tristan, Nora and Bragadireanu, Alexandru Mario and
                      Ghinescu, Stefan Alexandru and Hutanu, Ovidiu Emanuel and
                      Enik, Temur and Falaleev, Valeri and Kekelidze, Vladimir and
                      Korotkova, Anna and Madigozhin, Dmitry and Misheva, Milena
                      and Molokanova, Natalia and Movchan, Sergei and Polenkevich,
                      Irina and Potrebenikov, Yuri and Shkarovskiy, Sergey and
                      Zinchenko, Alexander and Baeva, Aigul and Baigarashev,
                      Dosbol and Emelyanov, Dmitry and Fedotov, Sergei and
                      Khotyantsev, Alexey and Gushchin, Evgeny and Kleimenova,
                      Alina and Kudenko, Yury and Kurochka, Viktoriia and
                      Medvedeva, Mariia and Mefodev, Aleksandr and Shaikhiev,
                      Artur and Kholodenko, Sergey and Kurshetsov, Viktor and
                      Obraztsov, Vladimir and Ostankov, Aleksandr and Semenov,
                      Vitali and Sugonyaev, Valentin and Yushchenko, Oleg and
                      Bician, Lubos and Blazek, Tomas and Cerny, Vladimir and
                      Koval, Michal and Kucerova, Zuzana and Ceccucci, Augusto and
                      Bernhard, Johannes and Danielsson, Hans and Döbrich,
                      Babette and Duval, Francois and Gatignon, Lau and Guida,
                      Roberto and Hahn, Ferdinand and Holzer, Eva Barbara and
                      Jenninger, Berthold and Laycock, Paul and Lehmann Miotto,
                      Giovanna and Lichard, Peter and Mapelli, Alessandro and Noy,
                      Matthew and Palladino, Vito and Perrin-Terrin, Mathieu and
                      Ruggiero, Giuseppe and Ryjov, Vladimir and Schuchmann,
                      Simone and Venditti, Stefano and Brunetti, Maria Brigida and
                      Bache, Thomas and Goudzovski, Evgueni and Lazzeroni,
                      Cristina and Fascianelli, Valeria and Lurkin, Nicolas and
                      Newson, Francis and Parkinson, Christopher and Romano,
                      Angela and Sergi, Antonino and Sturgess, Andrew and Swallow,
                      Joel and Heath, Helen and Page, Ryan and Trilov, Stoyan and
                      Angelucci, Bruno and Britton, David and Protopopescu, Dan
                      and Graham, Connor and Jones, Roger William Lewis and
                      Dainton, John Bourke and Fry, John Richard and Fulton, Liam
                      and Hutchcroft, David and Carmignani, Joseph and Massri,
                      Karim and Maurice, Emilie and Wrona, Bozydar and Conovaloff,
                      Adam and Cooper, Peter and Coward, David and Rubin, Philip
                      David},
      collaboration = {{NA62 Collaboration}},
      title        = {{S}earch for $\pi^0$ decays to invisible particles},
      journal      = {Journal of high energy physics},
      volume       = {02},
      number       = {2},
      issn         = {1029-8479},
      address      = {[Trieste]},
      publisher    = {SISSA},
      reportid     = {PUBDB-2022-00595, arXiv:2010.07644. CERN-EP-2020-193},
      pages        = {201},
      year         = {2021},
      abstract     = {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.},
      keywords     = {pi0: invisible decay (INSPIRE) / background: fluctuation
                      (INSPIRE) / fermion: coupling (INSPIRE) / pi0: branching
                      ratio: upper limit (INSPIRE) / K: branching ratio (INSPIRE)
                      / axion-like particles (INSPIRE) / hidden sector (INSPIRE) /
                      CERN SPS (INSPIRE) / lifetime (INSPIRE) / mixing (INSPIRE) /
                      NA62 (INSPIRE) / experimental results (INSPIRE)},
      cin          = {$Z_EL$},
      ddc          = {530},
      cid          = {$I:(DE-H253)Z_EL-20210408$},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611)},
      pid          = {G:(DE-HGF)POF4-611},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2010.07644},
      howpublished = {arXiv:2010.07644},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2010.07644;\%\%$},
      UT           = {WOS:000681463700001},
      doi          = {10.1007/JHEP02(2021)201},
      url          = {https://bib-pubdb1.desy.de/record/474205},
}