ALP production in weak mesonic decays

Abstract

Axion-Like-Particles are among the most economical and well motivated extensions of the Standard Model. In this work ALP production from hadronic and leptonic meson decays are studied. The hadronization part of these decay amplitudes have been obtained using Brodsky-Lepage method or LQCD, at needs. In particular, the general expressions for ALP emission in mesonic s- and t-channel tree-level processes are thoroughly discussed, for pseudoscalar and vector mesons. Accordingly, the calculation of the decay amplitudes for $M_I\to M_{F}a$ and $M\to \ell \nu a$ are presented. Finally, bounds on the (low-energy effective Lagrangian) ALP-fermion couplings are derived, from present and future flavor experiments.

arXiv comment41 pages, 5 tables and 10 figures

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