Revisiting $$K \rightarrow \pi a$$ decays
نویسندگان
چکیده
Abstract The theoretical calculation for pseudo-scalars hadronic decays $$K \rightarrow \pi a$$ K ? ? 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 contribution to charged and neutral pseudo-scalar decay ALP estimated. Assuming generic couplings SM fermions, latest NA62/E949 results $$K^+ ^+ + present/future KOTO $$K^0_L ^0 L 0 used provide updated bounds on ALP-fermion Lagrangian sector. Finally, interplay between investigated.
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ژورنال
عنوان ژورنال: European Physical Journal C
سال: 2022
ISSN: ['1434-6044', '1434-6052']
DOI: https://doi.org/10.1140/epjc/s10052-022-10146-x