Search for <i>π</i><SUP>0</SUP> decays to invisible particles

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Gil, E Cortina, Kleimenova, A, Minucci, E, Padolski, S, Petrov, P, Shaikhiev, A, Volpe, R, Numao, T, Velghe, B, Bryman, D et al (show 190 more authors) , 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, Ramusino, A Cotta, 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, AM, Ghinescu, SA, Hutanu, OE, 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, Dobrich, B, Federici, L, Gamberini, E, Gatignon, L, Guida, R, Hahn, F, Holzer, EB, Jenninger, B, Koval, M, Laycock, P, Miotto, G Lehmann, Lichard, P, Mapelli, A, Massri, K, Noy, M, Palladino, V, Perrin-Terrin, M, Pinzino, J, Ryjov, V, Schuchmann, S, Venditti, S, Bache, T, Brunetti, MB, Duk, V, Fascianelli, V, Fry, JR, 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 ORCID: 0000-0002-1705-1061, Dainton, JB, Jones, RWL, Ruggiero, G, Fulton, L, Hutchcroft, D ORCID: 0000-0002-4174-6509, Maurice, E, Wrona, B, Conovaloff, A, Cooper, P, Coward, D and Rubin, P (2021) Search for <i>π</i><SUP>0</SUP> decays to invisible particles. JOURNAL OF HIGH ENERGY PHYSICS, 2021 (2). 201-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>The NA62 experiment at the CERN SPS reports a study of a sample of 4 × 10<jats:sup>9</jats:sup> tagged <jats:italic>π</jats:italic><jats:sup>0</jats:sup> mesons from <jats:italic>K</jats:italic><jats:sup>+</jats:sup> → <jats:italic>π</jats:italic><jats:sup>+</jats:sup><jats:italic>π</jats:italic><jats:sup>0</jats:sup>(<jats:italic>γ</jats:italic>), searching for the decay of the <jats:italic>π</jats:italic><jats:sup>0</jats:sup> to invisible particles. No signal is observed in excess of the expected background fluctuations. An upper limit of 4<jats:italic>.</jats:italic>4 × 10<jats:sup><jats:italic>−</jats:italic>9</jats:sup> 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 <jats:italic>K</jats:italic><jats:sup>+</jats:sup> → <jats:italic>π</jats:italic><jats:sup>+</jats:sup><jats:italic>X</jats:italic>, where <jats:italic>X</jats:italic> is a particle escaping detection with mass in the range 0.110–0.155 GeV<jats:italic>/c</jats:italic><jats:sup>2</jats:sup> and rest lifetime greater than 100 ps. Model-dependent upper limits are obtained assuming <jats:italic>X</jats:italic> to be an axion-like particle with dominant fermion couplings or a dark scalar mixing with the Standard Model Higgs boson.</jats:p>

Item Type:	Article
Uncontrolled Keywords:	Beyond Standard Model, Exotics, Fixed target experiments, Rare decay
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	21 Apr 2021 10:26
Last Modified:	14 Mar 2024 23:02
DOI:	10.1007/JHEP02(2021)201
Open Access URL:	https://link.springer.com/content/pdf/10.1007/JHEP...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3120046