Quark flavor phenomenology of the QCD axion
In: Physical review / D, 102 (1), Art. Nr.: 015023 ; ISSN: 2470-0010, 2470-0029, 2020
academicJournal
Zugriff:
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.
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Quark flavor phenomenology of the QCD axion
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Autor/in / Beteiligte Person: | Camalich, Jorge Martin ; Pospelov, Maxim ; Vuong, Pham Ngoc Hoa ; Ziegler, Robert ; Zupan, Jure |
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Zeitschrift: | Physical review / D, 102 (1), Art. Nr.: 015023 ; ISSN: 2470-0010, 2470-0029, 2020 |
Veröffentlichung: | American Physical Society, 2020 |
Medientyp: | academicJournal |
ISSN: | 2470-0010 |
DOI: | 10.5445/IR/1000123860 |
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