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Cortina Gil, E 
ORCID: 0000-0001-9627-699X, Kleimenova, A ORCID: 0000-0002-9129-4985, Minucci, E ORCID: 0000-0002-3972-6824, Padolski, S ORCID: 0000-0002-6795-7670, Petrov, P, Shaikhiev, A ORCID: 0000-0003-2921-8743, Volpe, R ORCID: 0000-0003-1782-2978, Numao, T ORCID: 0000-0001-5232-6190, Petrov, Y ORCID: 0000-0003-2643-8740, Velghe, B ORCID: 0000-0002-0797-8381 et al (show 224 more authors) , Wong, VWS ORCID: 0000-0001-5975-8164, Bryman, D ORCID: 0000-0002-9691-0775, Fu, J, Hives, Z ORCID: 0000-0002-5025-993X, Husek, T ORCID: 0000-0002-7208-9150, Jerhot, J ORCID: 0000-0002-3236-1471, Kampf, K ORCID: 0000-0003-1096-667X, Zamkovsky, M ORCID: 0000-0002-5067-4789, De Martino, B ORCID: 0000-0003-2028-9326, Perrin-Terrin, M ORCID: 0000-0002-3568-1956, Döbrich, B ORCID: 0000-0002-6008-8601, Lezki, S ORCID: 0000-0002-6909-774X, Akmete, AT ORCID: 0000-0002-5580-5477, Aliberti, R ORCID: 0000-0003-3500-4012, Khoriauli, G ORCID: 0000-0002-6353-8452, Kunze, J, Lomidze, D ORCID: 0000-0003-3936-6942, Peruzzo, L ORCID: 0000-0002-4752-6160, Vormstein, M, Wanke, R ORCID: 0000-0002-3636-360X, Dalpiaz, P, Fiorini, M ORCID: 0000-0001-6559-2084, Mazzolari, A ORCID: 0000-0003-0804-6778, Neri, I ORCID: 0000-0002-9669-1058, Norton, A ORCID: 0000-0001-5959-5879, Petrucci, F ORCID: 0000-0002-7220-6919, Soldani, M ORCID: 0000-0003-4902-943X, Wahl, H ORCID: 0000-0003-0354-2465, Bandiera, L ORCID: 0000-0002-5537-9674, Cotta Ramusino, A ORCID: 0000-0003-1727-2478, Gianoli, A ORCID: 0000-0002-2456-8667, Romagnoni, M ORCID: 0000-0002-2775-6903, Sytov, A ORCID: 0000-0001-8789-2440, Iacopini, E ORCID: 0000-0002-5605-2497, Latino, G ORCID: 0000-0002-4098-3502, Lenti, M ORCID: 0000-0002-2765-3955, Lo Chiatto, P ORCID: 0000-0002-4177-557X, Panichi, I ORCID: 0000-0001-7749-7914, Parenti, A ORCID: 0000-0002-6132-5680, Bizzeti, A ORCID: 0000-0001-5729-5530, Bucci, F ORCID: 0000-0003-1726-3838, Antonelli, A ORCID: 0000-0001-7671-7890, Georgiev, G ORCID: 0000-0001-6884-3942, Kozhuharov, V ORCID: 0000-0002-0669-7799, Lanfranchi, G ORCID: 0000-0002-9467-8001, Martellotti, S ORCID: 0000-0002-4363-7816, Moulson, M ORCID: 0000-0002-3951-4389, Spadaro, T ORCID: 0000-0002-7101-2389, Tinti, G ORCID: 0000-0003-1364-844X, Ambrosino, F ORCID: 0000-0001-5577-1820, Capussela, T, Corvino, M ORCID: 0000-0002-2401-412X, D'Errico, M ORCID: 0000-0001-5326-1106, Di Filippo, D ORCID: 0000-0003-1567-6786, Fiorenza, R ORCID: 0000-0003-4965-7073, Giordano, R ORCID: 0000-0002-5496-7247, Massarotti, P ORCID: 0000-0002-9335-9690, Mirra, M ORCID: 0000-0002-1190-2961, Napolitano, M ORCID: 0000-0003-1074-9552, Rosa, I ORCID: 0009-0002-7564-1825, Saracino, G ORCID: 0000-0002-0714-5777, Anzivino, G ORCID: 0000-0002-5967-0952, Brizioli, F ORCID: 0000-0002-2047-441X, Imbergamo, E, Lollini, R ORCID: 0000-0003-3898-7464, Piandani, R ORCID: 0000-0003-2226-8924, Santoni, C ORCID: 0000-0001-7023-7116, Barbanera, M ORCID: 0000-0002-3616-3341, Cenci, P ORCID: 0000-0001-6149-2676, Checcucci, B ORCID: 0000-0002-6464-1099, Lubrano, P ORCID: 0000-0003-0221-4806, Lupi, M ORCID: 0000-0001-9770-6197, Pepe, M ORCID: 0000-0001-5624-4010, Piccini, M ORCID: 0000-0001-8659-4409, Costantini, F ORCID: 0000-0002-2974-0067, Di Lella, L ORCID: 0000-0003-3697-1098, Doble, N ORCID: 0000-0002-0174-5608, Giorgi, M ORCID: 0000-0001-9571-6260, Giudici, S ORCID: 0000-0003-3423-7981, Lamanna, G ORCID: 0000-0001-7452-8498, Lari, E ORCID: 0000-0003-3303-0524, Pedreschi, E ORCID: 0000-0001-7631-3933, Sozzi, M ORCID: 0000-0002-2923-1465, Cerri, C, Fantechi, R ORCID: 0000-0002-6243-5726, Pontisso, L ORCID: 0000-0001-7137-5254, Spinella, F ORCID: 0000-0002-9607-7920, Mannelli, I ORCID: 0000-0003-0445-7422, D'Agostini, G ORCID: 0000-0002-6245-875X, Raggi, M ORCID: 0000-0002-7448-9481, Biagioni, A ORCID: 0000-0001-5820-1209, Cretaro, P ORCID: 0000-0002-2229-149X, Frezza, O ORCID: 0000-0001-8277-1877, Leonardi, E ORCID: 0000-0001-8728-7582, Lonardo, A ORCID: 0000-0002-5909-6508, Turisini, M ORCID: 0000-0002-5422-1891, Valente, P ORCID: 0000-0002-5413-0068, Vicini, P ORCID: 0000-0002-4379-4563, Ammendola, R ORCID: 0000-0003-4501-3289, Bonaiuto, V ORCID: 0000-0002-2328-4793, Fucci, A, Salamon, A ORCID: 0000-0002-8438-8983, Sargeni, F ORCID: 0000-0002-0131-236X, Arcidiacono, R ORCID: 0000-0001-5904-142X, Bloch-Devaux, B ORCID: 0000-0002-2463-1232, Boretto, M ORCID: 0000-0001-5012-4480, Menichetti, E ORCID: 0000-0001-7143-8200, Migliore, E ORCID: 0000-0002-2271-5192, Soldi, D ORCID: 0000-0001-9059-4831, Biino, C ORCID: 0000-0002-1397-7246, Filippi, A ORCID: 0000-0003-4715-8748, Marchetto, F ORCID: 0000-0002-5623-8494, Briano Olvera, A ORCID: 0000-0001-6121-3905, Engelfried, J ORCID: 0000-0001-5478-0602, Estrada-Tristan, N ORCID: 0000-0003-2977-9380, Reyes Santos, MA ORCID: 0000-0003-1347-2579, Rodriguez Rivera, KA ORCID: 0000-0001-5723-9176, Boboc, P ORCID: 0000-0001-5532-4887, Bragadireanu, AM, Ghinescu, SA ORCID: 0000-0003-3716-9857, Hutanu, OE, Bician, L ORCID: 0000-0001-9318-0116, Blazek, T ORCID: 0000-0002-2645-0283, Cerny, V ORCID: 0000-0003-1998-3441, Kucerova, Z ORCID: 0000-0001-8906-3902, Bernhard, J ORCID: 0000-0001-9256-971X, Ceccucci, A ORCID: 0000-0002-9506-866X, Ceoletta, M ORCID: 0000-0002-2532-0217, Danielsson, H ORCID: 0000-0002-1016-5576, De Simone, N, Duval, F, Federici, L ORCID: 0000-0002-3401-9522, Gamberini, E ORCID: 0000-0002-6040-4985, Gatignon, L ORCID: 0000-0001-6439-2945, Guida, R, Hahn, F, Holzer, EB ORCID: 0000-0003-2622-6844, Jenninger, B, Koval, M ORCID: 0000-0002-6027-317X, Laycock, P ORCID: 0000-0002-8572-5339, Lehmann Miotto, G ORCID: 0000-0001-9045-7853, Lichard, P ORCID: 0000-0003-2223-9373, Mapelli, A ORCID: 0000-0002-4128-1019, Marchevski, R ORCID: 0000-0003-3410-0918, Massri, K ORCID: 0000-0001-7533-6295, Noy, M, Palladino, V ORCID: 0000-0002-9786-9620, Pinzino, J ORCID: 0000-0002-7418-0636, Ryjov, V, Schuchmann, S ORCID: 0000-0002-8088-4226, Venditti, S, Bache, T ORCID: 0000-0003-4520-830X, Brunetti, MB ORCID: 0000-0003-1639-3577, Duk, V ORCID: 0000-0001-6440-0087, Fascianelli, V, Fry, JR ORCID: 0000-0002-3680-361X, Gonnella, F ORCID: 0000-0003-0885-1654, Goudzovski, E ORCID: 0000-0001-9398-4237, Henshaw, J ORCID: 0000-0001-7059-421X, Iacobuzio, L, Kenworthy, C ORCID: 0009-0002-8815-0048, Lazzeroni, C ORCID: 0000-0003-4074-4787, Lurkin, N ORCID: 0000-0002-9440-5927, Newson, F, Parkinson, C ORCID: 0000-0003-0344-7361, Romano, A ORCID: 0000-0003-1779-9122, Sanders, J ORCID: 0000-0003-1014-094X, Sergi, A ORCID: 0000-0001-9495-6115, Sturgess, A ORCID: 0000-0002-8104-5571, Swallow, J ORCID: 0000-0002-1521-0911, Tomczak, A ORCID: 0000-0001-5635-3567, Heath, H ORCID: 0000-0001-6576-9740, Page, R, Trilov, S ORCID: 0000-0003-0267-6402, Angelucci, B, Britton, D ORCID: 0000-0001-9998-4342, Graham, C ORCID: 0000-0001-9121-460X, Protopopescu, D ORCID: 0000-0002-8047-6513, Carmignani, J ORCID: 0000-0002-1705-1061, Dainton, JB, Jones, RWL ORCID: 0000-0002-6427-3513, Ruggiero, G ORCID: 0000-0001-6605-4739, Fulton, L, Hutchcroft, D ORCID: 0000-0002-4174-6509, Maurice, E ORCID: 0000-0002-7366-4364, Wrona, B ORCID: 0000-0002-1555-0262, Conovaloff, A, Cooper, P, Coward, D ORCID: 0000-0001-7588-1779, Rubin, P ORCID: 0000-0001-6678-4985, Baeva, A, Baigarashev, D ORCID: 0000-0001-6101-317X, Emelyanov, D, Enik, T ORCID: 0000-0002-2761-9730, Falaleev, V ORCID: 0000-0003-3150-2196, Fedotov, S, Gorshanov, K ORCID: 0000-0001-7912-5962, Gushchin, E ORCID: 0000-0001-8857-1665, Kekelidze, V ORCID: 0000-0001-8122-5065, Kereibay, D, Kholodenko, S ORCID: 0000-0002-0260-6570, Khotyantsev, A, Korotkova, A, Kudenko, Y ORCID: 0000-0003-3204-9426, Kurochka, V, Kurshetsov, V ORCID: 0000-0003-0174-7336, Litov, L ORCID: 0000-0002-8511-6883, Madigozhin, D ORCID: 0000-0001-8524-3455, Medvedeva, M, Mefodev, A, Misheva, M, Molokanova, N, Movchan, S, Obraztsov, V ORCID: 0000-0002-0994-3641, Okhotnikov, A ORCID: 0000-0003-1404-3522, Ostankov, A, Polenkevich, I, Potrebenikov, Yu ORCID: 0000-0003-1437-4129, Sadovskiy, A ORCID: 0000-0002-4448-6845, Semenov, V, Shkarovskiy, S, Sugonyaev, V ORCID: 0000-0003-4449-9993, Yushchenko, O ORCID: 0000-0003-4236-5115 and Zinchenko, A
(2024)
Measurement of the K+ → π+γγ decay.
Physics Letters B, 850.
p. 138513.
ISSN 0370-2693
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Abstract
A sample of 3984 candidates of the K<sup>+</sup>→π<sup>+</sup>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<sup>−7</sup>. The first search for production and prompt decay of an axion-like particle with gluon coupling in the process K<sup>+</sup>→π<sup>+</sup>a, a→γγ is also reported.
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