Measurement of the K+ → π+γγ decay

UNSPECIFIED (2024) Measurement of the K+ → π+γγ decay. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 850: 138513. p. 138513.

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
?? nuclear and high energy physics ??
ID Code:
216249
Deposited By:
Deposited On:
12 Mar 2024 14:50
Refereed?:
Yes
Published?:
Published
Last Modified:
13 Oct 2024 00:26