Measurement of the K+ → π+γγ decay

Cortina Gil, Eduardo; Minucci, Elisa; Padolski, Sergey; Petrov, Plamen; Velghe, Bob; Bryman, Douglas; Fu, Ji; Numao, Toshio; Petrov, Yevgeniy; Wong, Vincent Wai Sum

doi:10.1016/j.physletb.2024.138513

Measurement of the K+ → π+γγ decay

NA62

Collaboration

Nov 3, 2023

11 pages

Published in:

Phys.Lett.B 850 (2024) 138513

Published: Feb 7, 2024

e-Print:

2311.01837 [hep-ex]

DOI:

10.1016/j.physletb.2024.138513 (publication)

Report number:

CERN-EP-2023-247

Experiments:

CERN-NA-062

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Abstract: (Elsevier B.V.)

A sample of 3984 candidates of the

K^{+} \to π^{+} γ γ

decay, with an estimated background of

291 \pm 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 \pm 0.17) \times 10^{- 7}

. The first search for production and prompt decay of an axion-like particle with gluon coupling in the process

K^{+} \to π^{+} a

,

a \to γ γ

is also reported.

K+: secondary beam
K+: radiative decay
photon: pair production
perturbation theory: higher-order
higher-order: 1
mass spectrum: two-photon
mass spectrum: (2photon)
perturbation theory: chiral
coupling: (axion 2gluon)
K+: branching ratio: measured

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Measurement of the K+ → π+γγ decay

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Measurement of the K+ → π+γγ decay