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Search for π⁰ decays to invisible particles

Authors :
The NA62 Collaboration
Cortina Gil, E.
Kleimenova, A.
Minucci, E.
Padolski, S.
Petrov, P.
Shaikhiev, A.
Volpe, R.
Numao, T.
Velghe, B.
Bryman, D.
Fu, J.
Husek, T.
Jerhot, J.
Kampf, K.
Zamkovsky, M.
Aliberti, R.
Khoriauli, G.
Kunze, J.
Lomidze, D.
Marchevski, R.
Peruzzo, L.
Vormstein, M.
Wanke, R.
Dalpiaz, P.
Fiorini, M.
Neri, I.
Norton, A.
Petrucci, F.
Wahl, H.
Cotta Ramusino, A.
Gianoli, A.
Iacopini, E.
Latino, G.
Lenti, M.
Parenti, A.
Bizzeti, A.
Bucci, F.
Antonelli, A.
Georgiev, G.
Kozhuharov, V.
Lanfranchi, G.
Martellotti, S.
Moulson, M.
Spadaro, T.
Ambrosino, F.
Capussela, T.
Corvino, M.
Di Filippo, D.
Massarotti, P.
Mirra, M.
Napolitano, M.
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 Lella, L.
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.
Leonardi, E.
Lonardo, A.
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.
Engelfried, J.
Estrada-Tristan, N.
Bragadireanu, A. M.
Ghinescu, S. A.
Hutanu, O. E.
Baeva, A.
Baigarashev, D.
Emelyanov, D.
Enik, T.
Falaleev, V.
Kekelidze, V.
Korotkova, A.
Litov, L.
Madigozhin, D.
Misheva, M.
Molokanova, N.
Movchan, S.
Polenkevich, I.
Potrebenikov, Y.
Shkarovskiy, S.
Zinchenko, A.
Fedotov, S.
Gushchin, E.
Khotyantsev, A.
Kudenko, Y.
Kurochka, V.
Medvedeva, M.
Mefodev, A.
Kholodenko, S.
Kurshetsov, V.
Obraztsov, V.
Ostankov, A.
Semenov, V.
Sugonyaev, V.
Yushchenko, O.
Bician, L.
Blazek, T.
Cerny, V.
Kucerova, Z.
Bernhard, J.
Ceccucci, A.
Danielsson, H.
De Simone, N.
Duval, F.
Döbrich, B.
Federici, L.
Gamberini, E.
Gatignon, L.
Guida, R.
Hahn, F.
Holzer, E. B.
Jenninger, B.
Koval, M.
Laycock, P.
Lehmann Miotto, G.
Lichard, P.
Mapelli, A.
Massri, K.
Noy, M.
Palladino, V.
Perrin-Terrin, M.
Pinzino, J.
Ryjov, V.
Schuchmann, S.
Venditti, S.
Bache, T.
Brunetti, M. B.
Duk, V.
Fascianelli, V.
Fry, J. R.
Gonnella, F.
Goudzovski, E.
Iacobuzio, L.
Lazzeroni, C.
Lurkin, N.
Newson, F.
Parkinson, C.
Romano, A.
Sergi, A.
Sturgess, A.
Swallow, J.
Heath, H.
Page, R.
Trilov, S.
Angelucci, B.
Britton, D.
Graham, C.
Protopopescu, D.
Carmignani, J.
Dainton, J. B.
Jones, R. W. L.
Ruggiero, G.
Fulton, L.
Hutchcroft, D.
Maurice, E.
Wrona, B.
Conovaloff, A.
Cooper, P.
Coward, D.
Rubin, P.
Source :
Journal of high energy physics, 2021 (2), Article: 201
Publication Year :
2021

Abstract

The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 109 tagged π0 mesons from K+ → π+π0(γ), searching for the decay of the π0 to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4.4 × 10−9 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+ → π+X, where X is a particle escaping detection with mass in the range 0.110–0.155 GeV/c2 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.

Subjects

Subjects :
Exotics
Fixed target experiments
Rare decay
Physics
Beyond Standard Model, Exotics, Fixed target experiments, Rare decay
Beyond Standard Model
High Energy Physics::Experiment
ddc:530

Details

Language :
English
ISSN :
10298479
Database :
OpenAIRE
Journal :
Journal of high energy physics, 2021 (2), Article: 201
Accession number :
edsair.doi.dedup.....915b5063f7d4432b60ce1137695773d8

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