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- W4214842424 abstract "Abstract The theoretical calculation for pseudo-scalars hadronic decays $$K rightarrow pi a$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mi>K</mml:mi> <mml:mo>→</mml:mo> <mml:mi>π</mml:mi> <mml:mi>a</mml:mi> </mml:mrow> </mml:math> 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 $$K^+ rightarrow pi ^+ a$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:mi>a</mml:mi> </mml:mrow> </mml:math> decay and the present/future KOTO results for the $$K^0_L rightarrow pi ^0 a$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msubsup> <mml:mi>K</mml:mi> <mml:mi>L</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>π</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mi>a</mml:mi> </mml:mrow> </mml:math> 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." @default.
- W4214842424 created "2022-03-05" @default.
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- W4214842424 date "2022-03-01" @default.
- W4214842424 modified "2023-10-16" @default.
- W4214842424 title "Revisiting $$K rightarrow pi a$$ decays" @default.
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- W4214842424 doi "https://doi.org/10.1140/epjc/s10052-022-10146-x" @default.
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