Search for a feebly interacting particle <i>X</i> in the decay <i>K</i><SUP>+</SUP> → <i>π</i><SUP>+</SUP><i>X</i>

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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, 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, Yu, Shkarovskiy, S, Zinchenkot, 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, , 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, Goud-zovski, 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, 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 a feebly interacting particle <i>X</i> in the decay <i>K</i><SUP>+</SUP> → <i>π</i><SUP>+</SUP><i>X</i>. JOURNAL OF HIGH ENERGY PHYSICS, 2021 (3).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title><jats:p>A search for the <jats:italic>K</jats:italic><jats:sup>+</jats:sup> → <jats:italic>π</jats:italic><jats:sup>+</jats:sup><jats:italic>X</jats:italic> decay, where <jats:italic>X</jats:italic> is a long-lived feebly interacting particle, is performed through an interpretation of the <jats:italic>K</jats:italic><jats:sup>+</jats:sup> → <jats:inline-formula><jats:alternatives><jats:tex-math>$$ {\pi}^{+}\nu \overline{\nu} $$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>ν</mml:mi> <mml:mover> <mml:mi>ν</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> analysis of data collected in 2017 by the NA62 experiment at CERN. Two ranges of <jats:italic>X</jats:italic> masses, 0–110 MeV<jats:italic>/c</jats:italic><jats:sup>2</jats:sup> and 154–260 MeV<jats:italic>/c</jats:italic><jats:sup>2</jats:sup>, and lifetimes above 100 ps are considered. The limits set on the branching ratio, BR(<jats:italic>K</jats:italic><jats:sup>+</jats:sup> → <jats:italic>π</jats:italic><jats:sup>+</jats:sup><jats:italic>X</jats:italic>), are competitive with previously reported searches in the first mass range, and improve on current limits in the second mass range by more than an order of magnitude.</jats:p>

Item Type:	Article
Uncontrolled Keywords:	Beyond Standard Model, Exotics, Fixed target experiments
Divisions:	Faculty of Science and Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	16 Nov 2021 08:44
Last Modified:	16 Oct 2023 20:58
DOI:	10.1007/JHEP03(2021)058
Open Access URL:	https://link.springer.com/content/pdf/10.1007/JHEP...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3143205