Measurement of the K+ → π+γγ decay

The NA62 Collaboration

doi:10.1016/j.physletb.2024.138513

Measurement of the K⁺ → π⁺γγ decay

The NA62 Collaboration

University of Louvain
TRIUMF
University of British Columbia
Charles University
Aix-Marseille Université
Max-Planck-Institut für Physik
Institut für Physik
Johannes Gutenberg University
Sezione INFN di Ferrara
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
University of Liverpool

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

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.

Original language	English
Article number	138513
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	850
DOIs	https://doi.org/10.1016/j.physletb.2024.138513
Publication status	Published - 1 Mar 2024
Externally published	Yes

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10.1016/j.physletb.2024.138513

Cite this

@article{7535fee421b943da8bc9f3fa21e7c20d,

title = "Measurement of the K+ → π+γγ decay",

abstract = "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{\textendash}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){\texttimes}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.",

author = "\{The NA62 Collaboration\} and \{Cortina Gil\}, E. and A. Kleimenova and E. Minucci and S. Padolski and P. Petrov and A. Shaikhiev and R. Volpe and T. Numao and Y. Petrov and B. Velghe and Wong, \{V. W.S.\} and D. Bryman and J. Fu and Z. Hives and T. Husek and J. Jerhot and K. Kampf and M. Zamkovsky and \{De Martino\}, B. and M. Perrin-Terrin and B. D{\"o}brich and S. Lezki and Akmete, \{A. T.\} and R. Aliberti and G. Khoriauli and J. Kunze and D. Lomidze and L. Peruzzo and M. Vormstein and R. Wanke and P. Dalpiaz and M. Fiorini and A. Mazzolari and I. Neri and A. Norton and F. Petrucci and M. Soldani and H. Wahl and L. Bandiera and \{Cotta Ramusino\}, A. and A. Gianoli and M. Romagnoni and A. Sytov and E. Iacopini and G. Latino and M. Lenti and \{Lo Chiatto\}, P. and I. Panichi and A. Parenti and E. Maurice",

note = "Publisher Copyright: {\textcopyright} 2024 The Author",

year = "2024",

month = mar,

day = "1",

doi = "10.1016/j.physletb.2024.138513",

language = "English",

volume = "850",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Measurement of the K+ → π+γγ decay

AU - The NA62 Collaboration

AU - Cortina Gil, E.

AU - Kleimenova, A.

AU - Minucci, E.

AU - Padolski, S.

AU - Petrov, P.

AU - Shaikhiev, A.

AU - Volpe, R.

AU - Numao, T.

AU - Petrov, Y.

AU - Velghe, B.

AU - Wong, V. W.S.

AU - Bryman, D.

AU - Fu, J.

AU - Hives, Z.

AU - Husek, T.

AU - Jerhot, J.

AU - Kampf, K.

AU - Zamkovsky, M.

AU - De Martino, B.

AU - Perrin-Terrin, M.

AU - Döbrich, B.

AU - Lezki, S.

AU - Akmete, A. T.

AU - Aliberti, R.

AU - Khoriauli, G.

AU - Kunze, J.

AU - Lomidze, D.

AU - Peruzzo, L.

AU - Vormstein, M.

AU - Wanke, R.

AU - Dalpiaz, P.

AU - Fiorini, M.

AU - Mazzolari, A.

AU - Neri, I.

AU - Norton, A.

AU - Petrucci, F.

AU - Soldani, M.

AU - Wahl, H.

AU - Bandiera, L.

AU - Cotta Ramusino, A.

AU - Gianoli, A.

AU - Romagnoni, M.

AU - Sytov, A.

AU - Iacopini, E.

AU - Latino, G.

AU - Lenti, M.

AU - Lo Chiatto, P.

AU - Panichi, I.

AU - Parenti, A.

AU - Maurice, E.

PY - 2024/3/1

Y1 - 2024/3/1

N2 - 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.

AB - 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.

U2 - 10.1016/j.physletb.2024.138513

DO - 10.1016/j.physletb.2024.138513

M3 - Article

AN - SCOPUS:85184939580

SN - 0370-2693

VL - 850

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 138513

ER -

Measurement of the K+ → π+γγ decay

Abstract

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Measurement of the K⁺ → π⁺γγ decay