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Quark flavor phenomenology of the QCD axion

Camalich, Jorge Martin; Pospelov, Maxim; Vuong, Pham Ngoc Hoa; Ziegler, Robert 1; Zupan, Jure
1 Institut für Theoretische Teilchenphysik (TTP), Karlsruher Institut für Technologie (KIT)


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.

Verlagsausgabe §
DOI: 10.5445/IR/1000123860
Veröffentlicht am 20.09.2020
DOI: 10.1103/PhysRevD.102.015023
Web of Science
Zitationen: 85
Zitationen: 92
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2470-0010, 2470-0029
KITopen-ID: 1000123860
Erschienen in Physical review / D
Verlag American Physical Society (APS)
Band 102
Heft 1
Seiten Art. Nr.: 015023
Vorab online veröffentlicht am 27.07.2020
Nachgewiesen in Web of Science
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