Revisiting K→πa decays

The theoretical calculation for pseudo-scalars hadronic decays K → π a is reviewed. While one-loop penguin contributions are usually considered, tree-level processes have most often been overlooked in literature. Following the Lepage–Brodsky approach the tree-level contribution to the charged and ne...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2022-03, Vol.82 (3)
Main Authors: Guerrera, A. W. M., Rigolin, S.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Cosmology
Couplings
Decay
Elementary Particles
Experiments
Fermions
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quarks
Regular Article - Theoretical Physics
Scalars
String Theory
Symmetry
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Summary:The theoretical calculation for pseudo-scalars hadronic decays K → π a is reviewed. While one-loop penguin contributions are usually considered, tree-level processes have most often been overlooked in literature. Following the Lepage–Brodsky approach the tree-level contribution to the charged and neutral pseudo-scalar decay in ALP is estimated. Assuming generic ALP couplings to SM fermions, the latest NA62/E949 results for the K + → π + a decay and the present/future KOTO results for the K L 0 → π 0 a decay are used to provide updated bounds on the ALP-fermion Lagrangian sector. Finally, the interplay between the tree-level and one-loop contributions is investigated.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-022-10146-x