Measurement of the K+ → π+γγ decay

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...

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Main Authors:	E. Cortina Gil, A. Kleimenova, E. Minucci, S. Padolski, P. Petrov, A. Shaikhiev, R. Volpe, T. Numao, Y. Petrov, B. Velghe, V.W.S. Wong, D. Bryman, J. Fu, Z. Hives, T. Husek, J. Jerhot, K. Kampf, M. Zamkovsky, B. De Martino, M. Perrin-Terrin, B. Döbrich, S. Lezki, A.T. Akmete, R. Aliberti, G. Khoriauli, J. Kunze, D. Lomidze, L. Peruzzo, M. Vormstein, R. Wanke, P. Dalpiaz, M. Fiorini, A. Mazzolari, I. Neri, A. Norton, F. Petrucci, M. Soldani, H. Wahl, L. Bandiera, A. Cotta Ramusino, A. Gianoli, M. Romagnoni, A. Sytov, E. Iacopini, G. Latino, M. Lenti, P. Lo Chiatto, I. Panichi, A. Parenti, A. Bizzeti, F. Bucci, A. Antonelli, G. Georgiev, V. Kozhuharov, G. Lanfranchi, S. Martellotti, M. Moulson, T. Spadaro, G. Tinti, F. Ambrosino, T. Capussela, M. Corvino, M. D'Errico, D. Di Filippo, R. Fiorenza, R. Giordano, P. Massarotti, M. Mirra, M. Napolitano, I. Rosa, G. Saracino, G. Anzivino, F. Brizioli, E. Imbergamo, R. Lollini, R. Piandani, C. Santoni, M. Barbanera, P. Cenci, B. Checcucci, P. Lubrano, M. Lupi, M. Pepe, M. Piccini, F. Costantini, L. Di Lella, N. Doble, M. Giorgi, S. Giudici, G. Lamanna, E. Lari, E. Pedreschi, M. Sozzi, C. Cerri, R. Fantechi, L. Pontisso, F. Spinella, I. Mannelli, G. D'Agostini, M. Raggi, A. Biagioni, P. Cretaro, O. Frezza, E. Leonardi, A. Lonardo, M. Turisini, P. Valente, P. Vicini, R. Ammendola, V. Bonaiuto, A. Fucci, A. Salamon, F. Sargeni, R. Arcidiacono, B. Bloch-Devaux, M. Boretto, E. Menichetti, E. Migliore, D. Soldi, C. Biino, A. Filippi, F. Marchetto, A. Briano Olvera, J. Engelfried, N. Estrada-Tristan, M.A. Reyes Santos, K.A. Rodriguez Rivera, P. Boboc, A.M. Bragadireanu, S.A. Ghinescu, O.E. Hutanu, L. Bician, T. Blazek, V. Cerny, Z. Kucerova, J. Bernhard, A. Ceccucci, M. Ceoletta, H. Danielsson, N. De Simone, F. Duval, L. Federici, E. Gamberini, L. Gatignon, R. Guida, F. Hahn, E.B. Holzer, B. Jenninger, M. Koval, P. Laycock, G. Lehmann Miotto, P. Lichard, A. Mapelli, R. Marchevski, K. Massri, M. Noy, V. Palladino, J. Pinzino, V. Ryjov, S. Schuchmann, S. Venditti, T. Bache, M.B. Brunetti, V. Duk, V. Fascianelli, J.R. Fry, F. Gonnella, E. Goudzovski, J. Henshaw, L. Iacobuzio, C. Kenworthy, C. Lazzeroni, N. Lurkin, F. Newson, C. Parkinson, A. Romano, J. Sanders, A. Sergi, A. Sturgess, J. Swallow, A. Tomczak, H. Heath, R. Page, S. Trilov, B. Angelucci, D. Britton, C. Graham, D. Protopopescu, J. Carmignani, J.B. Dainton, R.W.L. Jones, G. Ruggiero, L. Fulton, D. Hutchcroft, E. Maurice, B. Wrona, A. Conovaloff, P. Cooper, D. Coward, P. Rubin, A. Baeva, D. Baigarashev, D. Emelyanov, T. Enik, V. Falaleev, S. Fedotov, K. Gorshanov, E. Gushchin, V. Kekelidze, D. Kereibay, S. Kholodenko, A. Khotyantsev, A. Korotkova, Y. Kudenko, V. Kurochka, V. Kurshetsov, L. Litov, D. Madigozhin, M. Medvedeva, A. Mefodev, M. Misheva, N. Molokanova, S. Movchan, V. Obraztsov, A. Okhotnikov, A. Ostankov, I. Polenkevich, Yu. Potrebenikov, A. Sadovskiy, V. Semenov, S. Shkarovskiy, V. Sugonyaev, O. Yushchenko, A. Zinchenko
Format:	Article
Language:	English
Published:	Elsevier 2024-03-01
Series:	Physics Letters B
Online Access:	http://www.sciencedirect.com/science/article/pii/S0370269324000716

_version_	1797263011115696128
author	E. Cortina Gil A. Kleimenova E. Minucci S. Padolski P. Petrov A. Shaikhiev R. Volpe T. Numao Y. Petrov B. Velghe V.W.S. Wong D. Bryman J. Fu Z. Hives T. Husek J. Jerhot K. Kampf M. Zamkovsky B. De Martino M. Perrin-Terrin B. Döbrich S. Lezki A.T. Akmete R. Aliberti G. Khoriauli J. Kunze D. Lomidze L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini A. Mazzolari I. Neri A. Norton F. Petrucci M. Soldani H. Wahl L. Bandiera A. Cotta Ramusino A. Gianoli M. Romagnoni A. Sytov E. Iacopini G. Latino M. Lenti P. Lo Chiatto I. Panichi A. Parenti A. Bizzeti F. Bucci A. Antonelli G. Georgiev V. Kozhuharov G. Lanfranchi S. Martellotti M. Moulson T. Spadaro G. Tinti F. Ambrosino T. Capussela M. Corvino M. D'Errico D. Di Filippo R. Fiorenza R. Giordano P. Massarotti M. Mirra M. Napolitano I. Rosa G. Saracino G. Anzivino F. Brizioli E. Imbergamo R. Lollini R. Piandani C. Santoni M. Barbanera P. Cenci B. Checcucci P. Lubrano M. Lupi M. Pepe M. Piccini F. Costantini L. Di Lella N. Doble M. Giorgi S. Giudici G. Lamanna E. Lari E. Pedreschi M. Sozzi C. Cerri R. Fantechi L. Pontisso F. Spinella I. Mannelli G. D'Agostini M. Raggi A. Biagioni P. Cretaro O. Frezza E. Leonardi A. Lonardo M. Turisini P. Valente P. Vicini R. Ammendola V. Bonaiuto A. Fucci A. Salamon F. Sargeni R. Arcidiacono B. Bloch-Devaux M. Boretto E. Menichetti E. Migliore D. Soldi C. Biino A. Filippi F. Marchetto A. Briano Olvera J. Engelfried N. Estrada-Tristan M.A. Reyes Santos K.A. Rodriguez Rivera P. Boboc A.M. Bragadireanu S.A. Ghinescu O.E. Hutanu L. Bician T. Blazek V. Cerny Z. Kucerova J. Bernhard A. Ceccucci M. Ceoletta H. Danielsson N. De Simone F. Duval L. Federici E. Gamberini L. Gatignon R. Guida F. Hahn E.B. Holzer B. Jenninger M. Koval P. Laycock G. Lehmann Miotto P. Lichard A. Mapelli R. Marchevski K. Massri M. Noy V. Palladino J. Pinzino V. Ryjov S. Schuchmann S. Venditti T. Bache M.B. Brunetti V. Duk V. Fascianelli J.R. Fry F. Gonnella E. Goudzovski J. Henshaw L. Iacobuzio C. Kenworthy C. Lazzeroni N. Lurkin F. Newson C. Parkinson A. Romano J. Sanders A. Sergi A. Sturgess J. Swallow A. Tomczak H. Heath R. Page S. Trilov B. Angelucci D. Britton C. Graham D. Protopopescu J. Carmignani J.B. Dainton R.W.L. Jones G. Ruggiero L. Fulton D. Hutchcroft E. Maurice B. Wrona A. Conovaloff P. Cooper D. Coward P. Rubin A. Baeva D. Baigarashev D. Emelyanov T. Enik V. Falaleev S. Fedotov K. Gorshanov E. Gushchin V. Kekelidze D. Kereibay S. Kholodenko A. Khotyantsev A. Korotkova Y. Kudenko V. Kurochka V. Kurshetsov L. Litov D. Madigozhin M. Medvedeva A. Mefodev M. Misheva N. Molokanova S. Movchan V. Obraztsov A. Okhotnikov A. Ostankov I. Polenkevich Yu. Potrebenikov A. Sadovskiy V. Semenov S. Shkarovskiy V. Sugonyaev O. Yushchenko A. Zinchenko
author_facet	E. Cortina Gil A. Kleimenova E. Minucci S. Padolski P. Petrov A. Shaikhiev R. Volpe T. Numao Y. Petrov B. Velghe V.W.S. Wong D. Bryman J. Fu Z. Hives T. Husek J. Jerhot K. Kampf M. Zamkovsky B. De Martino M. Perrin-Terrin B. Döbrich S. Lezki A.T. Akmete R. Aliberti G. Khoriauli J. Kunze D. Lomidze L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini A. Mazzolari I. Neri A. Norton F. Petrucci M. Soldani H. Wahl L. Bandiera A. Cotta Ramusino A. Gianoli M. Romagnoni A. Sytov E. Iacopini G. Latino M. Lenti P. Lo Chiatto I. Panichi A. Parenti A. Bizzeti F. Bucci A. Antonelli G. Georgiev V. Kozhuharov G. Lanfranchi S. Martellotti M. Moulson T. Spadaro G. Tinti F. Ambrosino T. Capussela M. Corvino M. D'Errico D. Di Filippo R. Fiorenza R. Giordano P. Massarotti M. Mirra M. Napolitano I. Rosa G. Saracino G. Anzivino F. Brizioli E. Imbergamo R. Lollini R. Piandani C. Santoni M. Barbanera P. Cenci B. Checcucci P. Lubrano M. Lupi M. Pepe M. Piccini F. Costantini L. Di Lella N. Doble M. Giorgi S. Giudici G. Lamanna E. Lari E. Pedreschi M. Sozzi C. Cerri R. Fantechi L. Pontisso F. Spinella I. Mannelli G. D'Agostini M. Raggi A. Biagioni P. Cretaro O. Frezza E. Leonardi A. Lonardo M. Turisini P. Valente P. Vicini R. Ammendola V. Bonaiuto A. Fucci A. Salamon F. Sargeni R. Arcidiacono B. Bloch-Devaux M. Boretto E. Menichetti E. Migliore D. Soldi C. Biino A. Filippi F. Marchetto A. Briano Olvera J. Engelfried N. Estrada-Tristan M.A. Reyes Santos K.A. Rodriguez Rivera P. Boboc A.M. Bragadireanu S.A. Ghinescu O.E. Hutanu L. Bician T. Blazek V. Cerny Z. Kucerova J. Bernhard A. Ceccucci M. Ceoletta H. Danielsson N. De Simone F. Duval L. Federici E. Gamberini L. Gatignon R. Guida F. Hahn E.B. Holzer B. Jenninger M. Koval P. Laycock G. Lehmann Miotto P. Lichard A. Mapelli R. Marchevski K. Massri M. Noy V. Palladino J. Pinzino V. Ryjov S. Schuchmann S. Venditti T. Bache M.B. Brunetti V. Duk V. Fascianelli J.R. Fry F. Gonnella E. Goudzovski J. Henshaw L. Iacobuzio C. Kenworthy C. Lazzeroni N. Lurkin F. Newson C. Parkinson A. Romano J. Sanders A. Sergi A. Sturgess J. Swallow A. Tomczak H. Heath R. Page S. Trilov B. Angelucci D. Britton C. Graham D. Protopopescu J. Carmignani J.B. Dainton R.W.L. Jones G. Ruggiero L. Fulton D. Hutchcroft E. Maurice B. Wrona A. Conovaloff P. Cooper D. Coward P. Rubin A. Baeva D. Baigarashev D. Emelyanov T. Enik V. Falaleev S. Fedotov K. Gorshanov E. Gushchin V. Kekelidze D. Kereibay S. Kholodenko A. Khotyantsev A. Korotkova Y. Kudenko V. Kurochka V. Kurshetsov L. Litov D. Madigozhin M. Medvedeva A. Mefodev M. Misheva N. Molokanova S. Movchan V. Obraztsov A. Okhotnikov A. Ostankov I. Polenkevich Yu. Potrebenikov A. Sadovskiy V. Semenov S. Shkarovskiy V. Sugonyaev O. Yushchenko A. Zinchenko
author_sort	E. Cortina Gil
collection	DOAJ
description	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.
first_indexed	2024-03-08T00:50:18Z
format	Article
id	doaj.art-c0e758efab4549d4bf650fb04f89314e
institution	Directory Open Access Journal
issn	0370-2693
language	English
last_indexed	2024-04-25T00:06:13Z
publishDate	2024-03-01
publisher	Elsevier
record_format	Article
series	Physics Letters B
spelling	doaj.art-c0e758efab4549d4bf650fb04f89314e2024-03-14T06:13:16ZengElsevierPhysics Letters B0370-26932024-03-01850138513Measurement of the K+ → π+γγ decayE. Cortina Gil0A. Kleimenova1E. Minucci2S. Padolski3P. Petrov4A. Shaikhiev5R. Volpe6T. Numao7Y. Petrov8B. Velghe9V.W.S. Wong10D. Bryman11J. Fu12Z. Hives13T. Husek14J. Jerhot15K. Kampf16M. Zamkovsky17B. De Martino18M. Perrin-Terrin19B. Döbrich20S. Lezki21A.T. Akmete22R. Aliberti23G. Khoriauli24J. Kunze25D. Lomidze26L. Peruzzo27M. Vormstein28R. Wanke29P. Dalpiaz30M. Fiorini31A. Mazzolari32I. Neri33A. Norton34F. Petrucci35M. Soldani36H. Wahl37L. Bandiera38A. Cotta Ramusino39A. Gianoli40M. Romagnoni41A. Sytov42E. Iacopini43G. Latino44M. Lenti45P. Lo Chiatto46I. Panichi47A. Parenti48A. Bizzeti49F. Bucci50A. Antonelli51G. Georgiev52V. Kozhuharov53G. Lanfranchi54S. Martellotti55M. Moulson56T. Spadaro57G. Tinti58F. Ambrosino59T. Capussela60M. Corvino61M. D'Errico62D. Di Filippo63R. Fiorenza64R. Giordano65P. Massarotti66M. Mirra67M. Napolitano68I. Rosa69G. Saracino70G. Anzivino71F. Brizioli72E. Imbergamo73R. Lollini74R. Piandani75C. Santoni76M. Barbanera77P. Cenci78B. Checcucci79P. Lubrano80M. Lupi81M. Pepe82M. Piccini83F. Costantini84L. Di Lella85N. Doble86M. Giorgi87S. Giudici88G. Lamanna89E. Lari90E. Pedreschi91M. Sozzi92C. Cerri93R. Fantechi94L. Pontisso95F. Spinella96I. Mannelli97G. D'Agostini98M. Raggi99A. Biagioni100P. Cretaro101O. Frezza102E. Leonardi103A. Lonardo104M. Turisini105P. Valente106P. Vicini107R. Ammendola108V. Bonaiuto109A. Fucci110A. Salamon111F. Sargeni112R. Arcidiacono113B. Bloch-Devaux114M. Boretto115E. Menichetti116E. Migliore117D. Soldi118C. Biino119A. Filippi120F. Marchetto121A. Briano Olvera122J. Engelfried123N. Estrada-Tristan124M.A. Reyes Santos125K.A. Rodriguez Rivera126P. Boboc127A.M. Bragadireanu128S.A. Ghinescu129O.E. Hutanu130L. Bician131T. Blazek132V. Cerny133Z. Kucerova134J. Bernhard135A. Ceccucci136M. Ceoletta137H. Danielsson138N. De Simone139F. Duval140L. Federici141E. Gamberini142L. Gatignon143R. Guida144F. Hahn145E.B. Holzer146B. Jenninger147M. Koval148P. Laycock149G. Lehmann Miotto150P. Lichard151A. Mapelli152R. Marchevski153K. Massri154M. Noy155V. Palladino156J. Pinzino157V. Ryjov158S. Schuchmann159S. Venditti160T. Bache161M.B. Brunetti162V. Duk163V. Fascianelli164J.R. Fry165F. Gonnella166E. Goudzovski167J. Henshaw168L. Iacobuzio169C. Kenworthy170C. Lazzeroni171N. Lurkin172F. Newson173C. Parkinson174A. Romano175J. Sanders176A. Sergi177A. Sturgess178J. Swallow179A. Tomczak180H. Heath181R. Page182S. Trilov183B. Angelucci184D. Britton185C. Graham186D. Protopopescu187J. Carmignani188J.B. Dainton189R.W.L. Jones190G. Ruggiero191L. Fulton192D. Hutchcroft193E. Maurice194B. Wrona195A. Conovaloff196P. Cooper197D. Coward198P. Rubin199A. Baeva200D. Baigarashev201D. Emelyanov202T. Enik203V. Falaleev204S. Fedotov205K. Gorshanov206E. Gushchin207V. Kekelidze208D. Kereibay209S. Kholodenko210A. Khotyantsev211A. Korotkova212Y. Kudenko213V. Kurochka214V. Kurshetsov215L. Litov216D. Madigozhin217M. Medvedeva218A. Mefodev219M. Misheva220N. Molokanova221S. Movchan222V. Obraztsov223A. Okhotnikov224A. Ostankov225I. Polenkevich226Yu. Potrebenikov227A. Sadovskiy228V. Semenov229S. Shkarovskiy230V. Sugonyaev231O. Yushchenko232A. Zinchenko233Université Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumCorresponding author.; Université Catholique de Louvain, Louvain-La-Neuve, BelgiumUniversité Catholique de Louvain, Louvain-La-Neuve, BelgiumTRIUMF, Vancouver, British Columbia, CanadaTRIUMF, Vancouver, British Columbia, CanadaTRIUMF, Vancouver, British Columbia, CanadaTRIUMF, Vancouver, British Columbia, CanadaUniversity of British Columbia, Vancouver, British Columbia, CanadaUniversity of British Columbia, Vancouver, British Columbia, CanadaCharles University, Prague, Czech RepublicCharles University, Prague, Czech RepublicCharles University, Prague, Czech RepublicCharles University, Prague, Czech RepublicCharles University, Prague, Czech RepublicAix Marseille University, CNRS/IN2P3, CPPM, Marseille, FranceAix Marseille University, CNRS/IN2P3, CPPM, Marseille, FranceMax-Planck-Institut für Physik (Werner-Heisenberg-Institut), Garching, GermanyMax-Planck-Institut für Physik (Werner-Heisenberg-Institut), Garching, GermanyInstitut für Physik and PRISMA Cluster of Excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of Excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of Excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of Excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of Excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of Excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of Excellence, Universität Mainz, Mainz, GermanyInstitut für Physik and PRISMA Cluster of Excellence, Universität Mainz, Mainz, GermanyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di Fisica e Scienze della Terra dell'Università e INFN, Sezione di Ferrara, Ferrara, ItalyINFN, Sezione di Ferrara, Ferrara, ItalyINFN, Sezione di Ferrara, Ferrara, ItalyINFN, Sezione di Ferrara, Ferrara, ItalyINFN, Sezione di Ferrara, Ferrara, ItalyINFN, Sezione di Ferrara, Ferrara, ItalyDipartimento di 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ItalyLaboratori Nazionali di Frascati, Frascati, ItalyLaboratori Nazionali di Frascati, Frascati, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di Fisica “Ettore Pancini” e INFN, Sezione di Napoli, Napoli, ItalyDipartimento di 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dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Pisa, Pisa, ItalyINFN, Sezione di Pisa, Pisa, ItalyINFN, Sezione di Pisa, Pisa, ItalyINFN, Sezione di Pisa, Pisa, ItalyINFN, Sezione di Pisa, Pisa, ItalyScuola Normale Superiore e INFN, Sezione di Pisa, Pisa, ItalyDipartimento di Fisica, Sapienza Università di Roma e INFN, Sezione di Roma I, Roma, ItalyDipartimento di Fisica, Sapienza Università di Roma e INFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma I, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyINFN, Sezione di Roma Tor Vergata, Roma, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyDipartimento di Fisica dell'Università e INFN, Sezione di Torino, Torino, ItalyINFN, Sezione di Torino, Torino, ItalyINFN, Sezione di Torino, Torino, ItalyINFN, Sezione di Torino, Torino, ItalyInstituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, MexicoInstituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, MexicoInstituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, MexicoInstituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, MexicoInstituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, MexicoHoria Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaHoria Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaHoria Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaHoria Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest-Magurele, RomaniaFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, SlovakiaFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, SlovakiaFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, SlovakiaFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, SlovakiaCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandCERN, European Organization for Nuclear Research, Geneva, SwitzerlandSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics, University of Bristol, Bristol, United KingdomSchool of Physics, University of Bristol, Bristol, United KingdomSchool of Physics, University of Bristol, Bristol, United KingdomSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomSchool of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomPhysics Department, University of Lancaster, Lancaster, United KingdomPhysics Department, University of Lancaster, Lancaster, United KingdomPhysics Department, University of Lancaster, Lancaster, United KingdomPhysics Department, University of Lancaster, Lancaster, United KingdomSchool of Physical Sciences, University of Liverpool, Liverpool, United KingdomSchool of Physical Sciences, University of Liverpool, Liverpool, United KingdomSchool of Physical Sciences, University of Liverpool, Liverpool, United KingdomSchool of Physical Sciences, University of Liverpool, Liverpool, United KingdomPhysics and Astronomy Department, George Mason University, Fairfax, VA, USAPhysics and Astronomy Department, George Mason University, Fairfax, VA, USAPhysics and Astronomy Department, George Mason University, Fairfax, VA, USAPhysics and Astronomy Department, George Mason University, Fairfax, VA, USAAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNAuthors affiliated with an Institute or an international laboratory covered by a cooperation agreement with CERNA 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.http://www.sciencedirect.com/science/article/pii/S0370269324000716
spellingShingle	E. Cortina Gil A. Kleimenova E. Minucci S. Padolski P. Petrov A. Shaikhiev R. Volpe T. Numao Y. Petrov B. Velghe V.W.S. Wong D. Bryman J. Fu Z. Hives T. Husek J. Jerhot K. Kampf M. Zamkovsky B. De Martino M. Perrin-Terrin B. Döbrich S. Lezki A.T. Akmete R. Aliberti G. Khoriauli J. Kunze D. Lomidze L. Peruzzo M. Vormstein R. Wanke P. Dalpiaz M. Fiorini A. Mazzolari I. Neri A. Norton F. Petrucci M. Soldani H. Wahl L. Bandiera A. Cotta Ramusino A. Gianoli M. Romagnoni A. Sytov E. Iacopini G. Latino M. Lenti P. Lo Chiatto I. Panichi A. Parenti A. Bizzeti F. Bucci A. Antonelli G. Georgiev V. Kozhuharov G. Lanfranchi S. Martellotti M. Moulson T. Spadaro G. Tinti F. Ambrosino T. Capussela M. Corvino M. D'Errico D. Di Filippo R. Fiorenza R. Giordano P. Massarotti M. Mirra M. Napolitano I. Rosa G. Saracino G. Anzivino F. Brizioli E. Imbergamo R. Lollini R. Piandani C. Santoni M. Barbanera P. Cenci B. Checcucci P. Lubrano M. Lupi M. Pepe M. Piccini F. Costantini L. Di Lella N. Doble M. Giorgi S. Giudici G. Lamanna E. Lari E. Pedreschi M. Sozzi C. Cerri R. Fantechi L. Pontisso F. Spinella I. Mannelli G. D'Agostini M. Raggi A. Biagioni P. Cretaro O. Frezza E. Leonardi A. Lonardo M. Turisini P. Valente P. Vicini R. Ammendola V. Bonaiuto A. Fucci A. Salamon F. Sargeni R. Arcidiacono B. Bloch-Devaux M. Boretto E. Menichetti E. Migliore D. Soldi C. Biino A. Filippi F. Marchetto A. Briano Olvera J. Engelfried N. Estrada-Tristan M.A. Reyes Santos K.A. Rodriguez Rivera P. Boboc A.M. Bragadireanu S.A. Ghinescu O.E. Hutanu L. Bician T. Blazek V. Cerny Z. Kucerova J. Bernhard A. Ceccucci M. Ceoletta H. Danielsson N. De Simone F. Duval L. Federici E. Gamberini L. Gatignon R. Guida F. Hahn E.B. Holzer B. Jenninger M. Koval P. Laycock G. Lehmann Miotto P. Lichard A. Mapelli R. Marchevski K. Massri M. Noy V. Palladino J. Pinzino V. Ryjov S. Schuchmann S. Venditti T. Bache M.B. Brunetti V. Duk V. Fascianelli J.R. Fry F. Gonnella E. Goudzovski J. Henshaw L. Iacobuzio C. Kenworthy C. Lazzeroni N. Lurkin F. Newson C. Parkinson A. Romano J. Sanders A. Sergi A. Sturgess J. Swallow A. Tomczak H. Heath R. Page S. Trilov B. Angelucci D. Britton C. Graham D. Protopopescu J. Carmignani J.B. Dainton R.W.L. Jones G. Ruggiero L. Fulton D. Hutchcroft E. Maurice B. Wrona A. Conovaloff P. Cooper D. Coward P. Rubin A. Baeva D. Baigarashev D. Emelyanov T. Enik V. Falaleev S. Fedotov K. Gorshanov E. Gushchin V. Kekelidze D. Kereibay S. Kholodenko A. Khotyantsev A. Korotkova Y. Kudenko V. Kurochka V. Kurshetsov L. Litov D. Madigozhin M. Medvedeva A. Mefodev M. Misheva N. Molokanova S. Movchan V. Obraztsov A. Okhotnikov A. Ostankov I. Polenkevich Yu. Potrebenikov A. Sadovskiy V. Semenov S. Shkarovskiy V. Sugonyaev O. Yushchenko A. Zinchenko Measurement of the K+ → π+γγ decay Physics Letters B
title	Measurement of the K+ → π+γγ decay
title_full	Measurement of the K+ → π+γγ decay
title_fullStr	Measurement of the K+ → π+γγ decay
title_full_unstemmed	Measurement of the K+ → π+γγ decay
title_short	Measurement of the K+ → π+γγ decay
title_sort	measurement of the k    π γγ decay
url	http://www.sciencedirect.com/science/article/pii/S0370269324000716
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