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  • Measurement of the K+ → π+γ...
    Kleimenova, A.; Padolski, S.; Petrov, Y.; Velghe, B.; Wong, V.W.S.; Bryman, D.; Fu, J.; Hives, Z.; Jerhot, J.; Zamkovsky, M.; Perrin-Terrin, M.; Döbrich, B.; Lomidze, D.; Dalpiaz, P.; Petrucci, F.; Romagnoni, M.; Sytov, A.; Latino, G.; Lenti, M.; Bizzeti, A.; Antonelli, A.; Georgiev, G.; Lanfranchi, G.; Martellotti, S.; Moulson, M.; Capussela, T.; Corvino, M.; Massarotti, P.; Mirra, M.; Rosa, I.; Santoni, C.; Cenci, P.; Checcucci, B.; Lupi, M.; Giudici, S.; Lamanna, G.; Lari, E.; Sozzi, M.; Fantechi, R.; Pontisso, L.; Mannelli, I.; Frezza, O.; Leonardi, E.; Bonaiuto, V.; Salamon, A.; Bloch-Devaux, B.; Menichetti, E.; Migliore, E.; Filippi, A.; Marchetto, F.; Briano Olvera, A.; Reyes Santos, M.A.; Rodriguez Rivera, K.A.; Bragadireanu, A.M.; Ghinescu, S.A.; Bician, L.; Kucerova, Z.; Bernhard, J.; Duval, F.; Gamberini, E.; Gatignon, L.; Hahn, F.; Holzer, E.B.; Laycock, P.; Massri, K.; Palladino, V.; Brunetti, M.B.; Duk, V.; Henshaw, J.; Lazzeroni, C.; Romano, A.; Sanders, J.; Sturgess, A.; Swallow, J.; Tomczak, A.; Page, R.; Trilov, S.; Angelucci, B.; Graham, C.; Carmignani, J.; Jones, R.W.L.; Ruggiero, G.; Hutchcroft, D.; Wrona, B.; Conovaloff, A.; Coward, D.; Baigarashev, D.; Gorshanov, K.; Gushchin, E.; Kekelidze, V.; Khotyantsev, A.; Korotkova, A.; Kurshetsov, V.; Medvedeva, M.; Mefodev, A.; Molokanova, N.; Obraztsov, V.; Ostankov, A.; Potrebenikov, Yu; Shkarovskiy, S.

    Physics letters. B, March 2024, 2024-03-00, 2024-03-01, Letnik: 850
    Journal Article

    A sample of 3984 candidates of the K+→π+γγ decay, with an estimated background of 291±14 events, was collected by the NA62 experiment at CERN during 2017–2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation theory was found to be necessary. The decay branching ratio in the full kinematic range is measured to be (9.61±0.17)×10−7. The first search for production and prompt decay of an axion-like particle with gluon coupling in the process K+→π+a, a→γγ is also reported.