Quark flavor phenomenology of the QCD axion

By J. Camalich, M. Pospelov, Pham Ngoc Hoa Vuong, R. Ziegler, Jure Zupan. 2020

140 citations recorded by the source corpus.

Axion models with generation-dependent Peccei-Quinn charges can lead to flavor-changing neutral currents, thus motivating QCD axion searches at precision flavor experiments. We rigorously derive limits on the most general effective flavor-violating couplings from current measurements and assess their discovery potential. For two-body decays, we use available experimental data to derive limits on q→q′a decay rates for all flavor transitions. Axion contributions to neutral-meson mixing are calculated in a systematic way using chiral perturbation theory and operator product expansion. We also discuss in detail baryonic decays and three-body meson decays, which can lead to the best search strategies for some of the couplings. For instance, a strong limit on the Λ→na transition can be derived from the supernova SN 1987A. In the near future, dedicated searches for q→q′a decays at ongoing experiments could potentially test Peccei-Quinn breaking scales up to 10$^{12}$  GeV at NA62 or KOTO and up to 10$^{9}$  GeV at Belle II or BES III.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1e2a2ba3af6ef5634baa4bbefc7a75c22bb7fb6d

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In Nuclear and High Energy Physics

1. Luca Visinelli
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Citations in the corpus

• The landscape of QCD axion models (2020, background): “[592] appeared, where the importance of flavour violating transitions for axion searches was reiterated, and additional limits on FV axion couplings from three-body meson decays and baryonic decays, including the decay Λ→ na that would represent a new cooling mechanism for the SN1987A, were derived.”